Chapter 2 Terms/Problems
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
