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WorksheetsUnit 3 Review
Total questions: 69
Worksheet time: 2hrs 38mins
What is Newton's Third Law of Motion?
an object at rest stays at rest, and an object in motion will stay in motion until an outside force acts upon it
the acceleration of an object will be equal to the net force of an object divided by its mass
for every action, there will be an equal and opposite reaction
an object that is not moving will stay not moving moving until an unbalanced force acts on it
If a bird hit your windshield on your car, the force of the car on the bird equals
the force of the bird on your car.
the force of the car on the brid
an elastic collision on the windshield
a noncontact force acting on the windshield
What is the net force?
3 N
3 N, right
17 N, right
3 N, left
The forces in a force pair are in the _______ direction
opposite
same
Forces always act in equal and opposite pairs.
Newton's 1st Law
Newton's 2nd Law
Newton's 3rd Law
A player hits a ball with a bat. The action force is the impact of the bat against the ball. The reaction force is...
The grip of the player's hands on the ball
the air resistance of the ball
the force of the ball against the bat
What is the reaction force to a foot pushing down on the floor?
The foot going through the floor
The floor pushing back against the foot
The floor breaking to the foot
The amount of matter in an object.
Weight
Gravity
Volume
Mass
The image is an example of ..........
Friction
Force pairs
Motion
Balanced forces
If you pushed on a wall with 50N of force, the force acting on you from the wall would be .........
10 N
30 N
50 N
100N
What is Newton's Third Law of Motion?
an object at rest stays at rest, and an object in motion will stay in motion until an outside force acts upon it
the acceleration of an object will be equal to the net force of an object divided by its mass
an object that is not moving will stay not moving moving until an unbalanced force acts on it
for every action, there will be an equal and opposite reaction
What is the net force?
20 N
400 N
0 N
40 N
What is the net force for the following scenario. 100 N going left and 25 N going right.
125N
75N
75N left unbalanced
75N left balanced
Calculate the net force for the diagram.
800 N down unbalanced
600N down balanced
400 N down unbalanced
400 N up unbalanced
Calculate the net force for the diagram.
(a)
When two force act in the same direction, how would you calculate the net force?
Subtract the forces
Balance the forces
Add the forces
Divide the forces.
What is a force?
The sum of the forces action on an object.
When an object is experiencing friction.
A push or a pull on an object.
Calculating the net force of an object.
When forces are going in the opposite direction, how do you calculate net force?
Add the forces
Divide the forces
Find a fraction of the forces.
Subtract the forces.
Newton’s law states that for every action, there is an ________ reaction.
unequal and opposite
equal and similar
stronger and opposite
equal and opposite
When a small car pushes a big truck, the truck applies an equal and opposite force on the car.
False
True
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
Action reaction forces never cancel each other out because
They act on different objects.
They act on the same objects
They do not act on objects.
How is this an example of Newton’s Third law?
Only the ball is using the head
They are both exerting an equal force on each other
Only the head is pushing the ball
If two people with the same mass collide, they experience the same amount of force.
True
False
Action-reaction pairs can cause a change in motion.
True
False
Force always come in________
waves
triplets
pairs
When a heavy football player and a light one run into each other, who exerts more force
The light one
Their force are equal
The heavy one
The forces in a force pair are in _______ direction
opposite
same
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
if one object A exerts a force on a second object B, then B exerts a force on A, and the two forces are equal in magnitude and opposite in direction
true
false
Are you pulling on the earth
yes
no
maybe
depends on how i'm feeling
Which ISN'T part of newton's 3rd law
Jumping off the ground
Hitting a baseball
Rain in the sky
A car sitting on the road
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.
Newton's are the unit used to measure...
energy
force
weight
mass
All forces occur in pairs
true
false
Complete the law:
For every action, there is an ____________ reaction.
equal and opposite
equal
opposite
bigger and better
Complete the statement:
When an object is pushed, it __________________ with an equal and opposite force.
always pushes back
pushes back if it has a larger mass
pushes back it if has a smaller mass
will not push back
During P.E., your soccer ball collides with the goalie. What happens to the soccer ball?
It stops moving completely
It accelerates at the same rate and in the same direction as the goalie.
It accelerates more and in a different direction than the goalie.
It continues moving at the same velocity as before
The illustration to the right shows a student about to throw a ball while standing on a skateboard. Which illustration below correctly shows the skateboard’s direction of motion after the student releases the ball?
After shooting a cannonball, a cannon recoils with a much lower velocity than the cannonball. This is primarily because, compared to the cannonball, the cannon has a —
much greater mass
smaller amount of momentum
greater kinetic energy
smaller force applied to it
Which of these is the best description of the action-reaction force pair when the space shuttle lifts off from the launchpad?
The ground pushes the rocket up while exhaust gases push down on the ground.
Exhaust gases push down on air while the air pushes up on the rocket.
The rocket pushes exhaust gases down while the exhaust gases push the rocket up.
Gravity pulls the rocket exhaust down while friction pushes up against the atmosphere.
When the air is released from a balloon, the air moves in one direction, and the balloon moves in another direction. Which statement does this situation best illustrate?
What goes up must come down.
For every action there is an equal and opposite reaction.
The shape and size of an object affects air resistance.
The acceleration due to Earth’s gravity is 9.8 m/s2.
Seat belts in cars help prevent passenger injuries that would otherwise occur when a car came to an abrupt stop during a traffic accident. Which of these statements best explains why seat belts in cars are so important for passenger safety?
An object at rest does not contain kinetic energy.
The acceleration due to Earth’s gravity is 9.8 m/s2.
Applying a constant force on an object will cause its speed to increase.
An object in motion will stay in motion unless acted on by a net force.
Students filled 4 different boxes with different objects. Each student pushes the boxes with the same amount of force. Which box has the greatest change in speed?
According to Newton’s laws of motion, when two continental plates meet and push on one another, the smaller of the two plates will push back on the larger plate with a force that is -
less than the larger plate but in the opposite direction.
equal in size to the force of the larger plate but opposite in direction.
equal in size to the force of the larger plate and in the same direction.
greater than the larger plate and in the same direction.
The table shows times required for the same toy car to travel 10 m across an identical section of a floor after it is pushed. The difference in times was probably caused by differences in —
applied force
surface friction
air resistance
car mass
