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WorksheetsNewton's 3rd Law & Weight
Total questions: 60
Worksheet time: 2hrs 21mins
A baseball player hits a ball with 400 N of force. How much force does the ball exert on the bat?
300
400
500
Not enough info to tell
Your friend pushes you for making fun of him/her. What is the reaction force?
You pushing back on your friend
You pushing on the ground
There is no reaction force
Your friend pushing on the ground
When you jump up, you push the earth downwards. Why can't you tell that the earth has moved?
The force of you jumping up doesn't actually push the earth down.
The earth has much more mass so it doesn't move at all
The earth is firmly rooted
The earth has much more mass so you can't tell that it moved
In space, rockets move by shooting air backwards. What moves faster the air or the ship?
Neither, they both move at the same speed
The ship because it has more mass
The air because it has less mass
The ship because it is moving forwards
When you hit a tennis ball with a racket...
The ball exerts more force on the racket
The ball and racket exert the same force on each other
The racket exerts more force on the ball
It depends on how hard you hit it
Two students with different masses are sitting in roll-y chairs. The lighter one uses his feet to push the other
The lighter student will move faster because he has less mass
The heavier student will move more because he is being pushed
They will move with the same speed
The heavier student shouldn't move at all
What causes a jet ski to move forward?
The motor pushes the jet ski forward
The water pushes the jet ski forward
The person pushes the jet ski forward
Gravity pushes the jet ski forward
Can you push harder with one hand against the other?
Yes, always
No, never
Yes, but it depends on how hard you push
No, but this one is not the correct answer
Why is it easier to stand up if you push something down?
The thing you push down pushes you up
Your arms push your body up
It helps your legs get proper posture
It actually doesn't help, its just a mental thing
When you jump upwards, what force is moving you upwards once you leave the ground?
Gravity on to you
The air on to you
You on to the earth
There is no upward force once you leave the ground
A small bug splats against a car windshield. Which object experiences greater force?
The bug
The windshield
Both experience the same force
Not enough info given
A bug splats onto the windshield of a car. Which object has the greater acceleration?
The bug
The car
Both have the same acceleration
Not enough information to tell
When weight lifters raise the bar...
They are exerting less force than the bars weight
They are exerting an equal force to the bars weight
They are exerting more force than the bars weight
It depends on how heavy the bar is
Two classmates play a game of tug of war on ice. Which student would win?
The lighter student because he could slide on the ice easier
The heavier student because he has more mass
Without friction, neither student would win
Both students go backwards because of the force of the rope back onto them
The figure shows __________________
balanced force
unbalanced force
force pairs ( action and reaction force)
if the action force was 70 N to the right , the reaction force must be ___________________
70 N to the right
80 N to the left
70 N to the left
70 N up
Newton's Third Law is also known as...
The Law of Inertia
The Law of Acceleration
The Law of Conservation of Momentum (Force Pairs)
Force always come in________
waves
triplets
pairs
Newtons law states that for every action, there is an_________ reaction
unequal and opposite
stronger and opposite
equal and similar
equal and opposite
You drive past a farm, and you see a cow pulling a plow to till a field. You have just learned about Newton’s third law, and you wonder how the cow is able to move forward if the plow is exerting an equal and opposite force on the cow. Which of the following explains the movement of the cow and plow?
The force exerted by the cow on the plow is equal to the force that the cow exerts on the ground to move forward.
The force exerted by the cow on the plow is larger than the force that the cow exerts on the ground to move forward.
The force exerted by the cow on the plow is smaller than the force that the cow exerts on the ground to move forward.
A dog plays with a ball. Consider the action force the dog touching the ball. What is the reaction force?
The friction of the ground on the ball.
The ball pushing the ground.
The ground pulling the dog.
The ball touching the dog.
According to Newton's third law, if you push gently on something, it will push
gently on something else.
on you only if you aren't moving.
gently on you
on something only under the right conditions.
If a horse pulls on a wagon at rest, the wagon pulls back equally on the horse. Can the wagon be set into motion?
Yes, because there is a net force acting on the wagon.
Yes, because there is a time delay between action and reaction.
No, because the forces cancel each other.
Yes, because the horse's pull on the wagon is larger than the wagon's pull on the horse.
In which of the following shows the Law of Interaction being used in our everyday lives?
Person walking on earth.
Animal swimming in water.
Person hitting a tree.
All of the above.
The Moon's gravitational pull on the Earth is ____________ the Earth's gravitational pull on the Moon.
Equal to
Less than
Greater than
A fly hits the windscreen of a moving car. In this collision, how did the size of the force on the fly compare to the size of the force on the car?
The force that the car applied to the fly was ____________ the force that the fly applied to the car.
Equal to
Less than
Greater than
Giant magnets can be used to lift cars.
The force that the magnet applies to the car is ____________ the force that the car applies to the magnet.
Equal to
Less than
Greater than
Newton's First Law of Motion
Newton's Second Law of Motion
Newton's Third Law of Motion
Newton's Fourth Law of Motion
When you jump up, you push the earth downwards. Why can't you tell that the earth has moved?
The force of you jumping up doesn't actually push the earth down.
The earth has much more mass so it doesn't move at all
The earth is firmly rooted
The earth has much more mass so you can't tell that it moved
As one leg moves backward, it provides an equal and opposite force for the other foot to move forward.
No acceleration takes place. Runners are always at a fixed velocity.
The striking foot pushes backward against the ground. The friction with the ground provides an equal and opposite force forward.
The runner's upper body quickly leans forward, causing the entire body to begin accelerating forward
A student stands on the floor. While standing on the floor, he pulls down on a cable attached to weights. If the "action" is him pulling down on the cable, what is the "reaction"
The weights are lifted up
He feels tired
His weight decreases
The cable pulls him up
When a cannon fires a cannonball we observe Newton's third law. Which is the reaction force?
The cannon moving forward
The cannon moving backwards
The cannonball moving backwards
The cannonball moving forward
If a person pushes down on a trampoline, why do they move back up into the air?
The trampoline pushes back with a greater force than the person
The trampoline pushes back with less force than the person
The trampoline pushes back with an equal and opposite force as the person
How is this an example of Newton's 3rd Law?
Only his head is pushing on the ball
Only the ball is pushing on his head
Both the ball and the head are exerting equal force on each other
What is the reaction force in this picture?
Balloon moving forward
air releasing from one end of the balloon
gravity
friction
This picture shows .............
Newton 2nd law of motion
Newton 3rd law of motion
Newton 1st law of motion
I don't know
What will happen if the Action is greater than the Reaction?
The man will fall
The boat will sink
Nothing will happen
What happens to the balloon if the air is released ?
Balloon goes right
Balloon goes up
Balloon goes down
Balloon goes left
The two paired forces in Newton's third law:
act on different objects
are equal in size
are opposite in direction
are the same type
all of the above
Consider the picture shown above. Which is an action-reaction pair?
A and C upon B, and B upon A and C
A upon B and B upon A
B upon C and A upon C
A, B, and C are action-reaction forces
If you apply MORE force to the ground what happens to the force of the ground pushing on you?
The force remains the same
The force increases
The force decreases
Your friend pushes you for making fun of him/her. What is the reaction force?
You pushing back on your friend
You pushing on the ground
There is no reaction force
Your friend pushing on the ground
A book pushes down on a table with a force of 5N, the table..
Pushes back with a force of 5N
Pushes back with a force less than 5N
Pushes back with a forcec greater than 5N
Does nothing. A table has no force.
Action: Cannon pushes on cannonball
Reaction: Cannonball flies forward
Reaction: Cannonball pushes back on cannon
Reaction: Cannonball falls to the ground
Reaction: Cannonball pushes into the air
Action: Gravitational attraction pulls a book down
Reaction: A surface or the ground pushes the book up
Reaction: The book pulls back on the Earth
Reaction: The book falls to the ground
Reaction: The book pushes against a surface or the ground.
Action: A swimmer pushes the water backwards
Reaction: The swimmer moves forward
Reaction: The water pushes the swimmer forward
Reaction: The swimmer is tired
Reaction: The water moves backward
What is the action force when a basketball is bounced against the floor?
The ball exerts a force on the floor.
The floor exerts a force on the ball.
The ball moves down.
The ball moves up.
Which is NOT an action-reaction force pair from this image?
The elephant's feet push backward on the ground; the ground pushes forward on its feet.
The left end of the right rope pulls rightward on the man; the man pulls leftward on the left end of the right rope.
The tractor pulls leftward on the left end of the left rope; the left end of the left rope pulls rightward on the tractor.
The person's feet push backward on the ground; the ground pushed forward on his/her feet.
______ is the gravitational force exerted on an object
Mass
Gravity
Force
Weight
