force and motion
Momentum
(p) mass in motion p = mv. (p) mass in motion. m = mass Measured in kg - v = velocity Measured in m/s
Inertia
The tendency of an object to resist a change in motion.
Newton's 1st Law is also known as the...
law of inertia
mas in motion is know as
momentum
7 N to the right
newtons
Friction
resistance to motion when two objects are in contact with one another.
motion is produce by
unbalance force
The more (mass) you have, the more inertia you will have.
.......
If a person moves 20 meters then walks back to where they started. What is their displacement?
0 meters
each each of the newtons law and give an example for each.
1.Newton's 1st Law: an object will move at a constant velocity until a net force acts on it. 2.Newton's 2nd Law: A net force acting on an object causes the object to accelerate in the direction of the net force. 3.Newton's 3rd Law: every action has an equal and opposite reaction.
explain the different between three type of friction.
1.Static Friction: force between two surfaces that are NOT moving past each other 2.Sliding Friction: force between two surfaces that are sliding past each other 3.Rolling Friction: force between a rolling object and the surface it rolls on.
If a stick man walks 20 meters, then 10 meters back and stops what is stick mans displacement
10 m
how much does a 200 kg car weight
200 kg=440.928 pounds 200 times 9.8 1960 N
A 15.5 kg is push across the lunch label. the acceleration of the box is 24.2 m/s^2. what was the net force applied to the box.
24.2m/s^2 The formula for net force is Mass x acceleration in this case you would do 15.5 x24.2 answer:375.1
A 700kg car is driving with an acceleration of 5m/s^2. What is the force required to accelerate the car?
3,500 N
A boat's propeller exerting a force on the water, the water exerting equal force on propellar.
3rd law
An object has 16N applied to the left, 16N applied to the right, and 4N applied downward. What is the net force?
4 N downward
What would a man weigh if he has a mass of 60 kg? 60kg*9.8
588 N
What is the mass of a car that hits a deer with a force of 3,000 N if it started traveling at a speed of 50 m/s but slowed down to 25 m/s in 5 s before hitting the deer?
600 kg
Mikaia pushes a box with a force of 10 N to the right and Lisa pushes with a force of 3 N to the left. Find the net force applied to the box.
7 N to the right
What is the acceleration due to gravity on Earth?
9.8 m/s2
What is the weight of a person with a mass of 95 kg?
931 N
What is the mass of a car that hits a deer with a force of 3,000 N if it started traveling at a speed of 50 m/s but slowed down to 25 m/s in 5 s before hitting the deer? answer =600 kg
A car accelerates from 20 m/s to 60 m/s in 5 s. If the mass of the car is 150 kg, find the force on the car and the final momentum. answer = F = 1,200 N pfinal = 9,000 kg*m/s
A person on a paddle board exerts a force on the water with the paddle, the water moves, and the paddle board moves.Why
Action and reaction forces
law of universal gravitation
Any two masses exert an attractive force on each other.
Why does the Earth have more gravity than the moon?
Because the Earth has more mass than the moon
Ignoring air resistance and friction, what should be observed about two objects that are dropped at the same time?
Both objects should have the same acceleration
ignoring air resistance and friction, what should be observed about two objects that are dropped at the same time?
Both objects should have the same acceleration
The force exerted on a cart is constant. On a frictionless surface, if the cart's mass is increased, what will happen to its acceleration? Include which law supports your answer.
Decreases, because of Newton's 2nd Law
A car accelerates from 20 m/s to 60 m/s in 5 s. If the mass of the car is 150 kg, find the force on the car and the final momentum.
F = 1,200 N pfinal = 9,000 kg*m/s
A bicycle takes 8.0 seconds to accelerate at a constant rate from rest to a speed of 4.0 m/s. If the mass of the bicycle and rider together is 85 kg, what is the net force acting on the bicycle?
F=ma f=85 kg (1/2m/s^2 = 42.5km/s^2 m=85 kg 5m/s^2 4-0/8 f=ma a=f/m a=dv/dt
Name 3 common forces that can be applied to objects.
Friction Gravity Air resistance
3 common forces that can be applied to objects.
Friction, Gravity, Air resistance
Carl and Juan are playing catch. Carl throws a fastball to Juan and it hurts Juan's hand. Why is this the case?
Greater the acceleration, greater the force
Momentum describes
How much force is needed to change an object's motion
What force best explains why a feather and a tennis ball do not both fall with an acceleration of 9.8 m/s2 like they should? answer = air resistance
If the mass of a bulldozer is 1,250 kg and it is moving at a speed of 20 m/s, how much momentum does it have? answer= 25,000 kg*m/s
What two factors affect gravitational pull?
Mass and distance between masses
law of momentum conversation
One of the most powerful laws in physics is the law of momentum conservation. ... For a collision occurring between object 1 and object 2 in an isolated system, the total momentum of the two objects before the collision is equal to the total momentum of the two objects after the collision.
The maximum speed a falling human can reach is 55 m/s (or 118.06 mi/hr.) What is the name for this speed and what two forces become balanced for this to be possible?
Terminal velocity Gravity and Air Resistance
The maximum speed a falling human can reach is 55 m/s (or 118.06 mi/hr.) What is the name for this speed and what two forces become balanced for this to be possible?
Terminal velocity Gravity and Air Resistance
Law of Inertia
The focus of Lesson 1 is Newton's first law of motion - sometimes referred to as the law of inertia. An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
What happens if I decrease the mass of a truck and want to keep acceleration the same?
The force has to decrease
weight
The force of gravity on an object
gravity=force friction depends in 3 factors
The rougher the surface, the greater the friction. The greater the force pushing the two objects together, the greater the friction. The greater the surface area of the two objects touching, the greater the friction.
A watermelon is dropped from a tall building. Which statement about it's motion is FALSE?
The watermelon falls at a constant velocity.
Do balanced or unbalanced forces result in a change in motion?
Unbalanced forces
Newton's 1st Law is also known as the...= law of inertia
What would a man weigh if he has a mass of 60 kg? answer= 588 N
True or False? Inertia is the tendency of an object to continue at rest or in constant motion. true
Which example is an example of velocity=30 km/h north
Which of the following items has the MOST inertia?
a student
to calculate force. describe Newton's 2nd law? an object that has no motion.
acceleration and mass F=m x a Has balanced forces acting upon it
This force opposes the force of gravity when objects fall through the air.
air resistance
what is the acceleration of a wagon with a mass of 20 kg if a horizontal force of 64N is applied to it
f/m f=64N/20kg f=3.2N/kg
what is the mass of an object that is experiencing a net force of 200N and an accelaration of 500m/s^2
f=a*m m=200N/500 m/s^2 m=0.4kg/m/s =
what is the mass of object that is experiencing net force of 200N and a acceleration of 500 m/s^2
f=a*m m=200N/500 m/s^2 m=0.4kg/m/s =
1.What unit of measurement is used force? = N 2.What two variables are used to calculate force? acceleration and mass. 3.What formula is another way to describe Newton's 2nd law? F=m x a
f=force units for f=n a=accelartion units for m- kg m=mass units for a=m/s^2 units for p=kg x m/s units for v=m/s
what is the net force require to give an automobile with a mass of 1600 kg an accelaration of 4.4 m/s^2
f=m*a f=1600 kg(4.5 mls^2) f=7200 N
what is the net force required to give an automobile with a mass of 1,600 kg an acceleration of 4.5m/s^2
f=m*a f=1600 kg(4.5 mls^2) f=7200N
Balance force
forces that are equal in size and opposite in direction.
unbalanced forces
forces that are not equal in size and opposite in direction.
Why is it easier to ice skate on ice compared to sandpaper?
ice has less friction than sandpaper
sketch and label a picture of sky diver and explain terminal velocity
in stable, belly- to earth position, terminal velocity is about 200 km/h ( around 150- 180 mph). Further minimization of drag by streaming the body allows for speed in the vicinity of 500 km/h (310 mph).
a beach ball is rolling in a straight line toward you at a speed of 0.5m/s. its momentum is 0.25 kg*m/s. what is the mass of the beach ball?
m=p/v m=0.25 kg*m/s/0.5m/s m=0.5 kg
how much does a 200 kg car weight
m=p/v m=0.25 kg*m/s/0.5m/s m=0.5 kg
What two factors affect gravitational pull?
mas and distance between masses
The force exerted on a cart is constant. On a frictionless surface, if the cart's mass is increased, what will happen to its acceleration? Include which law supports your answer. =Decreases, because of Newton's 2nd Law
mass in motion is know as momentum.
law of coservation of momentum
momentum is never created or destroyed in a collision, it only is transferred.
the units for weight is
newtons
If a truck has a mass of 2,000kg and a velocity of 35m/s? what is it's momentum?
p=mv p=2000 kg*35m/s p=70,000 kgm/s
if a truck has a mass of 100 kg and a velocity of 35m/s what is its momentum
p=mv p=2000 kg*35m/s p=70,000 kgm/s
An 8-kilogram bowling ball is rolling in a straight line toward you. If its momentum is 16 kg·m/sec, how fast is it traveling?
p=mv mass, momentum p=16 kgm/m s/8 m/s v=2m/s
force
push and pull
force
push or pull one object exerts on another.
air resistance
resistance an object feels when travelling through the air.
difference between the factors that affect inertia and momentum
so, inertia describes and object's resistance to change in motion ( or lack of motion ), how much momentum is your force or speed of movement, but inertia is what keeps you going. 5p
Which of the following factors does NOT affect air resistance
spin
Gravity
the attraction two objects have on one another
net force
the combining of forces when two or more forces act on an object. m
