Chapter 2 Terms/Problems

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Newton's First law of motion

"A body will either remain at rest, or move with constant velocity, unless acted on by an unbalanced force."

Newton's Third law of motion

"If body A exerts a force on body B, then body B exerts an equal and opposite force on body A."

Work

"The force times the distance moved in the direction of the force."

Newton's Second law of motion

"The rate of change of momentum of a body is proportional to the applied force and takes place in the direction in which the force acts." (F=ma)

The change in momentum?

(Final-Initial) Momentum

How can you find velocity when given acceleration, initial velocity, and distance?

(V^2)=(u^2)+2as you can also use this equation to find initial velocity, acceleration, and distance.

Kinetic Energy with relation to momentum

(p^2)/(2m)

A 500 kilogram Thomas walks up 300 meters of stairs in 1 second. How much power does Thomas generate?

150,000 Watts

A 20 kilogram box is elevated to a height of 10 meters and dropped to the ground. What is the box's kinetic energy as it hits the ground?

2000 Joules

how many of the varibles in suvat do you need to solve

3

If a force is pulling and object with 5 Newtons at an angle of 60 degrees, what id the objects horizontal force?

5cos(60 deg)= horizontal force 5*0.5= horizontal force 2.5 Newtons is the horizontal force of the object

what is gravity represented as?

9.8 m/s^-2 or 10 m/s^-2

What is the Gravity on Earth?

9.8m/s^2

slope in a graph

= rise/run = y2-y1/x2-x1 = △y/△x

What is the equation for centripetal acceleration?

A = V^2/radius

When is a collision elastic?

A collision is elastic when momentum and kinetic energy is conserved.

When is a collision inelastic?

A collision is inelastic when momentum and kinetic energy is NOT conserved.

What is required to utilize the SUVAT equations?

A constant acceleration

mass

A fundamental measure of the amount of matter in the object. It is a scalar measure in kilograms

Efficiency

Efficiency is the ratio of how much work, energy, or power we get out of a system compared to how much we put in. efficiency= useful output/total input

what is the equation for things in motion?

Ek=p^2/2m

As the speed increases, the air resistance increases until a point is reached when the drag force is ____&____ to the weight.

Equal & opposite

Force

F (N) = mass (kg) × acceleration (m/s^2)

What is the equation for centripetal force?

F = mass x acceleration so... F = mass x V^2/radius

what are the impulse equations?

F delta t= m delta v F= ma F= m(delta v/ delta t)

What is the impulse equation?

F( △ time)=m( △ velocity)

How is momentum related to Newton's second law of motion?

F= △ p / △ t = m △ v / △ t = ma

Equation: centripetal force

F=(mv^2)/r; units=Newtons or kgm/s^2

formula of newton 's second law

F=ma

find the acceleration of a 1000g object that is being pulled with 10 Newtons of force while having 2 Newtons of frictional force

F=ma a=F/m Force is 10-2 or 8 Newtons mass= 1 kg a=8/1 Acceleration is 8 m/s^2

what is the centripetal force formula?

F=mv^2/r

v in SUVAT

Final Velocity/ms^-1

How do you find the velocity of an object with an Acceleration Time graph?

Find the area under the line of the graph.

There are many different types of force, including...?

Friction Normal or supporting or contact force Tension and compression Air resistance or drag Upthrust or buoyancy Lift Thrust Weight

What is Fn?

Frictional force

Power

Fs/t

another way to calculate power

Fs/t=FXs/t=Fv

what is gravitational potential energy?

Gravitational potential energy is the energy a body has because of its position, in particular, its vertical height relative to a given point.

If you drop two objects with different masses (at a free fall) they will have the same...

Gravity

A 180 lb skydiver jumps out of his plane at 3000ft. Where does he have the highest amount of kinetic energy and potential energy.

He has the most potential energy in the plane, and the most kinetic energy before he pulls his chute.

The basics behind Newton's first law

If a body is in translational equilibrium then it will not be accelerating.

Centripetal acceleration and force

If an object is moving with a centripetal acceleration, the unbalanced force causing the acceleration is called the centripetal force

Friction and centripetal force

If the friction is directed towards the center of the circle, the object would move in a circular motion

What is the momentum equation?

P= ma

Power

P=W/t

What are other forms of Power?

P=W/t , P=Fd/t , P=F(d/t) or P =Fv

Gravitational Potential Energy

PE = mgh mg = weight h = height

What is the formula for elastic potential energy? DN

PE elastic = (1/2) kx^2

Equation for gravitational potential energy

PE=mgh

What is the gravitational potential energy of a 10kg ball at the top of the building that is 56m high?

PE=mg△h =(10)(10)(56) =5600 J

What is the potential energy equation?

PE=wh or PE=(mg)h

What is the equation of Potential Energy?

Potential Energy = mgh or Mass * Acceleration due to Gravity * Height.

What is kinetic energy equal to?

Potential energy

What is the relationship between potential energy before an object is dropped and the kinetic energy at the end of the drop? DN

Potential energy = Kinetic energy potential energy before is equivalent to the kinetic energy at the end.

What is potential energy andi it's equation?

Potential energy is how much energy an onject at rest has because of its position. PE=Mass(Gravity)(Height)

What is power?

Power is a measure of how fast work is done or how quickly energy is converted

What is Power measured in?

Power is measured in watts (W) or 1J/s

What is the equation for power?

Power=work/time

When a body is accelerating, the resultant force acting on it is equal to its?

Rate of change of momentum

How do you find the slope of a graph.

Rise/run

What is the SUVAT equation with A,T,U, and S?

S = 1/2AT^2 + UT

Equation to find S

S=((u+v)/2)t

Problem: Given the problem: (kgm/s^2)(m^2)/(ms) Solve for the units.

Solution: (kgm/s^2) is an N, so rewrite the problem as: N(m^2)/(ms) The m's cancel out leaving: N(m)/(s) What equation uses force x displacement over seconds? Since power is N(m)/(s), the final unit is W.

Problem: A flower falls from rest from the top of a tree. At 16m, what is the velocity of the flower?

Solution: First, identify the known and unknown variables- S = 16m U = 0m/s V = Find A = 10m/s^2 T = Unknown Look for the proper SUVAT equation that solves for the needed variable. For this problem, use the equation V^2 = U^2 + 2AS. V^2 = (0m/s)^2 + 2(10m/s^2)(16m) V^2 = 2(10m/s^2)(16m) V^2 = 320m^2/s^2 √V^2 = √320m^2/s^2 V = 8√5m/s or about 18m/s

Problem: A point is taken from a displacement time graph. The coordinate is (5,10). What is the slope of the graph and what does it represent at that particular moment?

Solution: Since slope is found through taking the rise over run, the slope at this moment in time is 2 or more accurately, 2 m/s. The slope of a displacement time graph represents the velocity, so the velocity at this particular moment in time was 2m/s.

Problem: The area under the curve/line of a velocity time graph represents the displacement. If the area under the velocity time graph represents a triangle, what is the displacement given that the highest velocity was at 5m/s and the longest time was a 3s?

Solution: Since the area of a triangle is 1/2bh, multiply (1/2)(5m/s)(3s). The seconds will cancel, leaving meters. The displacement for this graph is 15/2m.

Problem: A ball with a mass of 8kg and an acceleration of 15m/s^2 collides into a wall. What is the force produced?

Solution: Using Newton's Second Law, F=ma, the force produced is 120N.

Problem: A 175kg weight lifter is able to lift 200N from rest in 5 seconds. How much power did he gernerate?

Solution: Using SUVAT, fill in the following information: S = Find U = 0m/s V = ? A = 10m/s^2 T = 5s Use the equation S = UT + 1/2AT^2. S = 0m/s(5s) + 1/2(10m/s^2)(5s)^2 S = 1/2(250m) S = 125m Now plug in the information into the equation Power = Work / Time Power = (125m)(200N)/5s Power = 5000W The weight lifter generated 5,000W.

Problem: A boy drags a sled up a hill with a height of 4m. The distance from the base of the hill to the top of the hill is 3m. The degree of elevation is 45 degrees. If the boy uses 5N of force to drag the sled, how much work did he do?

Solution: Using the Pythagorean Theorem, solve for the missing side. 3^2 + 4^2 = c^2 9 + 16 = c^2 25 = c^2 c = 5 Now is the equation Work = Fcos(theta)S Work = 5N(cos(45))5m Work = 18J The boy used about 18J.

Problem: A machine generates 100W of power. In order to run the machine, 150W of power is used. How efficient is this machine?

Solution: Using the equation Efficiency = Useful Output / Total Input, solve for the efficiency. Efficiency = 100W/150W Efficiency = 2/3 The machine is 2/3 efficient.

The slope or gradient of a distance-time graph gives the _________.

Speed

Speed

Speed is a measure of how fast an object is moving (scalar)

If the acceleration is uniform or constant, then these graphs will be simply vertical and horizontal _____ lines.

Straight

What is Supporting Force?

Supporting Force is the Normal Force exerted upon an object that is in contact with another stable object. For example, if a book is resting upon a surface, then the surface is exerting an upward force upon the book in order to support the weight of the book.

Energy is equal to what?

The ability to do work

What is g?

The acceleration due to gravity. On the surface of Earth, it is 9.8 x 10 m/s2.

What is the sloe of a Velocity Time graph equal to?

The acceleration of the object

Acceleration in circular motion

The acceleration vector is always perpendicular to the path of the motion and pointing in to the center

Kinetic Energy

The energy a body has because it is moving. Kinetic Energy (in J) = 1/2mv^2

Potential Energy

The energy a body has because of its position, in particular, its vertical height relative to a given point. Potential Energy (J) = mg△h

Terminal velocity

The final, constant, maximum velocity when air resistance is equal to gravity.

Weight is...?

The force exerted on a body by gravity W=mg

What is work

The force exerted on an object that causes it to move.

Friction

The force that causes a moving object to slow down when touching another object.

Centripetal Force

The force that is causing the centripetal acceleration. The direction of centripetal force is always towards the centre of the circle.

Inertia

The lack of movement or activity especially when movement or activity is needed.

What is Newton' first law of motion also known as?

The law of inertia

Gravitational potential energy increases when...

The object is at a higher height

What is the frictional force on an object traveling in a circular path?

The object's centripetal force

Impulse

The product of a force and the time during which it acts. Impulse (Ns) = F△t = m△v

What is the definition of power?

The rate at which work is being performed.

What is efficiency?

The rate at which work is done

What is velocity graph showing in relation to P-t Graph

The slope of P-t graph

What does the Slope of a Distance over time graph show?

The slope of a distance over time graph shows Velocity

What is acceleration graphing in relation to V t graph

The slope of velocity Time graph

Distance v Time graph

The slope or gradient of a distance-time graph gives the speed.

Velocity

The speed in a certain direction (vector)

Define Inertia

The tendency of an object to resist change in motion.

Conservation of Momentum

The total momentum before an event is equal to the total momentum after the event because momentum is conserved through interactions involving collisions and explosions.

Velocity in circular motion

The velocity vector is always tangent to the path of the motion.

What does it mean if a question specifies that an object is moving in a vacuum?

There is no air present, therefore air resistance does not exist and need not be factored into the equation.

t in SUVAT

Time/s

Which direction is the vector indicating when an object is still?

To below and upwards.

What happens to an object's acceleration when it moves in a linear fashion and changes direction?

To change directions, the object must stop. So the acceleration increases in the direction the object is turning.

average velocity

Total change in displacement divided by total time

Translational Equalibrium

Upthrust = weight + tension

A car of mass 1200 kg crashes into a wall at a speed of 25 m/s. The collision lasts 0.1 seconds. How much force does the car apply to the wall during the collision?

Using F△t=m△v, we get 300,000 Newtons

Equation to find V

V=u+at

Equation for V^2

V^2=u^2+2as

Is momentum a Scalar or Vector quantity?

Vector

What quantity is displacement?

Vector

The slope or gradient for a displacement-time graph the gradient gives the ________.

Velocity

slope of displacement vs time graph

Velocity

What is the slope of a Displacement time Graph equal to?

Velocity of the object

Work Equation

W = Fdcos(theta)

What unit is used for Power?

W(Wats)

Work in 90 degree angles.

W=(m•g)h

what is the equation for work?

W=Fs cos (theta)

work equation

W=Fscos(theta)

the equation for work is:

W=Fscosø

Work

W=F•s•cos0

Which equation do you use when you are pulling an object with force on an angle?

W=fscos(theta)

Problem: what is the weight of a 1.0 kg mass on the surface of the earth where g = 9.8 m s ^-2

W=mg. w= 1.0kg x 9.8 m s ^-2 = 9.8 N

How much work is required to lift a 4kg mass to a height of 5meters?

W=mgh W=4(10)(5) W=200 joules

What is energy measured in?

Watts

Examples of Newton's Third Law

When kicking a football, you exert a force on the ball, while the ball exerts an equal and opposite force on your foot. In tennis, the racket exerts a force on the tennis ball when it hits it, and in return, the tennis ball exerts an equal and opposite force on the racket.

When do you use the formula W=(mg)h?

When work is done vertically/when you are lifting something.

What is another way to write the equation for Work(net)?

Wnet = Force x Velocity

What is the equation for work, power, and efficiency? DN

Work = Fs cos(theta) Power = work / time Efficiency = useful output / total input

When is work done?

Work is done when a force moves its reference point in the direction of the force.

formula for acceleration

a = change in velocity per unit time

when does work occur?

a force is exerted whike pullin a wagon up a hil

whats the difference between a speed-time graph and a velocity-time graph??

a velocity time graph can show direction

Equation for acceleration

a= (final velocity-initial velocity)/time a=F/m

centripetal acceleration equation

a= (v^2 / r)

Equation: centripetal acceleration

a=(v^2)/r; units= m/s^2

what is the formula for centripetal acceleration?

a=v^2/r

What do you get from the slope of a velocity-time graph?

acceleration

the derivative of velocity

acceleration

Centripetal Acceleration

always pointed inwards of the circle.

theta

angle between the applied force and the direction of motion

One Watt = one ______ per second

answer: joule

average vs. instantaneous

average speed is the total distance over time while instantaneous is the speed at any given time

average vs instantaneous

average: over a period of time vs instantaneous: one instant

what are elastic collisions?

both momentum and kinetic energy is conserved

linear momentum

defined as the product of mass and velocity

What does the area under the curve or line of a velocity-time graph show?

displacement

what is displacement

displacement is defined as the distance travelled in a particular direction from a specified origin (vector)

difference between distance and displacement

displacement(vector) has a reference point, where distance(scalar) isnt dependent on direction

velocity is

displacement/ time

s in SUVAT

displacement/m

Equation for velocity

displacement/time (m/s)

what does the s in sugat sand for

distance

Speed equation

distance / time

s

distance moved measured in meters

speed is

distance/time

Equation for speed

distance/time (m/s)

Average value

dividing the total value by the total time

What is the equstion for effciency?

effciency= useful power gained / total power used

equation for efficiency

efficiency= useful output / total input

how do we solve for efficiency?

efficiency= useful output / total output

Kinetic Energy Definition

energy a particle has because of its motion

conservation of energy

energy cannot be created or destroy inly changed from one form to another

Principle of Conservation of Energy

energy cannot be created or destroyed; only changed from one form to another.

The change in momentum

final momentum - initial momentum

what does the v stand for?

final velocity

what is vector quantity that si unit is newtons?

force

relationship between force exerted and contact time between force and object

force is inversely proportional to contact time

F

force measured in Newtons

what is equilibrium

forces acting on an object are all balanced

name at least three different forces

friction weight air resistance

turning car

friction is the centripetal force

Velocity v Time graph

gradient gives the acceleration.

Displacement v Time graph

gradient gives the velocity.

bouncing ball

gravitational potential energy is changed to kinetic energy

PE

how to abbreviate potential energy

what does directly proportional mean?

if two variables are directly proportionate to one another then as one variable increases the other does as well.

what is the difference between elastic and inelastic collisions?

in elastic collisions, momentum and energy are conserved, in inelastic collisions, momentum is conserved but energy is not

Slope of a-t

is called a jerk

Watt

is equivalent to a Joule per second

an example of potential energy is

is when you stretch a rubberband but do not release it

what is kinetic and potential energy measured in

joules

what is the correct units for momentum

kg x m/sec

one joule is equivalent to...

kilogram x meter^2 / second^2

how do you find distance when given initial velocity, time, and acceleration?

know your SUVAT s=ut+(1/2)at^2 you can also use this equation to find initial velocity, acceleration, or time.

relationship between mass and inertia

less mass means less inertia and more mass means more inertia

Frictional Force

less mass-less inertia more mass-more inertia

acceleration is measured in...?

m/s^2

w= (weight) N

ma (mass)(acceleration due to gravity) kgm/s^2

Linear momentum

mass times linear velocity: p⃗ =mv⃗

inelastic collision

momentum is also conserved, but kinetic energy is not.

elastic collisions

momentum is conserved and kinetic energy is conserved (no energy is changed to heat)

elastic collision

momentum is conserved and so is kinetic enery

inelastic collisions

momentum is conserved but kinetic energy is not (some is converted to heat and other forms of energy)

what are inelastic collisions?

momentum is conserved, kinetic energy is not conserved

Momentum equation

momentum=mass x velocity

translating

moving from one place to another in a straight line

Unit for speed and velocity

ms^-1

Unit for acceleration

ms^-2

forces measured in

newton

what is the correct units for impulse

newtons per second

machine

no real machine or system can ever be 100% efficient because there will always be some energy changed to heat due to friction, air resistance, or other changes

what is centripetal force

not a new force just new direction

what is newton's 1st law

not moving constant velocity

What is newton's first law

not moving. Constant velocity

when a velocity-time function passes y=0, that means...?

object changes direction

what is instantaneous ?

one that is at particular point

what is average ?

one that is taken over a period time; A value that represents the sum of values divided by the number of values in the set.

what is frictional force?

oppose the motion of a body.

What is the symbol for momentum?

p

Equation for momentum

p= mv

Power Equation

p=Fv or p=w/t

momentum equals

p=mv or momentum = mass x velocity

what does T stand for?

period, time taken for one complete revolution

power equation

power = work/time

What is the alternat equation for power?

power=Fs/t=Fv

equation for power

power=energy or work / time

When a body is accelerating, the resultant force acting on it is equal to its

rate of change of momentum.

when do u use newtons second law

resultant or unbalanced force

distance/displacement symbol

s

units for the SUVAT equations

s - m u - m/s v - m/s a - m/s^2 t - sec

What are the three distance formulas in the suvat equation?

s=(u+ v)/2 (t) s=ut + (1/2)(at^2) s= vt - (1/2)(at^2)

Second SUVAT equation

s=(u+v/2)t

Third SUVAT equation

s=ut + 1/2at^2

distance equation

s=vt or s=[(u+v)/2]*(t)

what is kinematics

study of motion without reference to force or mass.

how do you find the slope of a curve?

take the tangent line and from there calculate the rise over run

energy

the ability to do work

the slope of a velocity-time graph =s...?

the acceleration

the slope of the velocity-time graph is

the acceleration

mass can be described as...?

the amount of matter in a body.

the area under a velocity-time graph =s...?

the displacement

gravitational potential energy

the energy a body has because of its position in particular, its vertical height relative to a given point

work

the measure of force applied times displacement

power

the measure of how fast work is done or how quickly energy is converted (scalar)

What does the Slope of a velocity over time graph show?

the slope of a velocity over time graph shows Acceleration

your velocity must include two things

the speed and direction

Instantaneous value

the speed at any instance in time

the slope of the displacement-time graph is

the velocity

Action and Reaction Forces

they are equal in size and opposite in direction

define constant velocity

two things, constant speed and constant direction; in other words constant speed in a straight line.

efficiency equation

useful output / total input

List the suvat equations.

v = u + at s = ((u + v)/(2))t s = ut + 1/2at^2 v^2 = u^2 + 2as

what are the two velocity equations?

v= u+ at v^2= u^2 +'2as

First SUVAT equation

v=u + at

final velocity equation.

v=u + at v=s/t (s is displacement)

Four suvat equations

v=u + at, s=(u+v/2)t, s=ut + 1/2at^2 & v^2 = u^2 + 2as

Fourth SUVAT equation

v^2 = u^2 + 2as

What do you get from the slope of a distance-time graph?

velocity

What does the area under the curve or line of an acceleration-time graph show?

velocity

derivative of displacement

velocity

how is weight related to mass ?

w=mg

what is the correct units for power

watts

an example of gravitational potential energy is

when you hold the rubber band out but do not drop it

an example of Kinetic energy is

when you shoot a rubber band (whenever an object moves, it possesses kinetic energy)

an example of conservation of energy is

when you stretch the rubber band out it has potential energy when you release it the potential energy transfers into kinetic energy.

W

work measured in Joules

Are potential energy and kinetic energy related?

yes, the Change in PE= the Change in KE.

What is the definition of efficiency?

Effciency is the amount of work gotten out of a machine vs. the work put into it.

What is the equation of Efficiency?

Efficiency = (Useful Output) / (Total Input)

We can ignore the effects of air resistance as long as...?

...as long as the body is small and hard, and the height is not too great.

What does a Watt equal to?

1 Joule per second

Convert Watts to Joules

1 Watt (W)= 1 Joule (J) per second

How much horizontal force does it take to keep a box of mass 2kg from sliding down a slope of incline 30 degrees (Denote gravity as 10 m/s^2 and remember that the normal force is perpendicular to the surface an object rests upon)?

10 Newtons

Force of Gravity

10 ms^-1

Efficiency

A ratio of how much work, energy, or power you get out of a system compared to how much is put in

Distance

A scalar quantity of how far an object travels

What is the qualitative description of Force?

A vector quantity that is measured in Newtons.

Rules for Efficiency

Efficiency is a ratio, therefore, they are no units. Efficiency also cannot be 100% as there will always be some energy changed due to factors such as friction and air resistance

The gradient of the velocity-time graph gives the _________.

Acceleration

slope of velocity vs time graph

Acceleration

If the velocity is constantly increasing over a period of time with a rate of change of -1, What is the acceleration

Acceleration is the slope of velocity which would be -1.

What do you need to be able to use the SUVAT equations?

Acceleration to be constant and ignore air resistance

a in SUVAT

Acceleration/ms^-2

What is energy?

An ability to do work

What is Kinetic energy

An energy of motion

Centripetal Acceleration

Centripetal Acceleration is defined as the type of acceleration that occurs due to the change in velocity of a body around a circle. The equation is a=v^2/r

What does this symbol mean △?

Change in the quantity (ex. change in speed)

A non-linear/curved displacement-time graph indicates a...?

Changing velocity

Suvat equations work for any situation where the acceleration of the body is ____?

Constant

A linear velocity-time graph indicates a...?

Constant acceleration

A linear displacement-time graph indicates a...?

Constant velocity

What are three things you can get from a graph?

Coordinates, the slope, and area under the line/curve.

What is the relationship between acceleration and force?

Directly proportional F=ma

What is the area under a Velocity time graph equal to?

Distance travled

what are the 3 types of graphs?

Distance vs. Time, Velocity vs. Time, & Acceleration vs. Time

What is Downward Force?

Downward Force is Weight or Gravitational Force

u in SUVAT

Initial Velocity/ms^-1

What is contact force?

It is a force that acts at the point of contact between two objects, in contrast to body forces. There is a contact force that the ground exerts on an object when an object is touching the ground. since gravity pulls the object towards the center of the earth, the surface of the earth must exert a force in oder to prevent he object from falling through the ground.

Centripetal force?

It is an extra name that is given to a force that already exists

weight

It is the force of gravity on the object and may be defined as the mass times the acceleration of gravity, w = mg. It is a vector measured in newtons

What is the the unit for potential and kinetic energies? DN

Joules (J)

the unit of work is:

Joules (J)

What is the equation for kinetic energy?

KE=(1/2)mv^2

One joule is equivalent to one...

Kilogram x meter sq divided by seconds sq (Kg)(m^2)/sec^2

what is kinetic energy?

Kinetic energy is the energy a body has because it is moving. The word "kinetic" refers to motion.

What is Kinetic energy and it's equation.

Kinetic energy is the energy an object in motion has. KE=(1/2) M V^2

What are the different ways you can classify energy as?

Kinetic, Gravitational Potential, Elastic Potential, Thermal, Light, Sound, Chemical, electrical, Magnetic and Nuclear

How do you find distance when you are given initial velocity, final velocity, and time?

Know your SUVAT s=((u+v)/2)t you can also use this equation to find initial velocity, final velocity, or time.

how do you find final velocity?

Know your SUVAT v=u+at you can also use this equation to find initial velocity, acceleration, or time.

What is the elastic collision equation?

M1V1+M2V2=M1V1+M2V2

If Maria is standing on a train moving at 7 m/s to the right (assume right is positive) and Diego is standing still on the platform, what is each of their relative velocities in relation to each other?

Maria's velocity relative to Diego is 7 m/s to the right and Diego's velocity relative to Maria is -7 m/s or 7 m/s to the left.

What is force times change in time equal to?

Mass times change in velocity minus collision

what is weight?

Mass x Gravity

What is conserved in KE

Momentum

What happens during elastic collisions?

Momentum and kinetic energy is conserved. The body always move separately.

What happens during inelastic collisions?

Momentum is conserved, but kinetic energy is not conserved. The bodies may stick together.

Centripetal

Moving/leaning towards the center

The change in kinetic energy is equal to...

Negative change in gravitational potential energy

Change in kinetic energy is equal to...

Net work done


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