WorksheetsConcept 1.3 Colliding Objects Review-8th Grade
Total questions: 23
Worksheet time: 12mins
1. A mother is pushing a stroller with one child in it. If she adds a second child of equal mass to a stroller, and pushes the stroller with the same force as before, the speed of the stroller would:
Stay the same
Double
Be half as much
Triple
2. Two balls in a vacuum chamber are dropped simultaneously from different heights. Which characteristic will be the same for both the balls throughout their motion?
speed
velocity
acceleration
kinetic energy
3. A car speeding on a racetrack begins to make a turn when it runs through a large amount of oil. According to Newton's third law, which statement best describes what happens to the car?
The tires spin faster, which slows down the car.
The car's tires continue to push against the road, but the road pushes on the tires with double the force, causing the car to spin.
The oil reduces the friction between the tires and the road. This causes the car to move in a straight line off the track.
The car's tires stop pushing on the road while the road continues to push against the tires, causing the car to slide.
4. According to Newton's second law of motion, upon what two factors does the acceleration of an object depend?
the velocity of the object and the amount of force applied on it
the mass and weight of the object
the mass of the object and the amount of force applied to it.
the speed and direction that the object is moving.
5. A ball is dropped in vacuum. Which characteristic will not change when the ball is falling?
velocity
distance
kinetic energy
acceleration
6. Mass is a measure of which of the following quantities?
energy
matter
space
motion
7. Newton's third law of motion states that _______________.
for every action, there is an equal and opposite reaction.
an object at rest will stay at rest or an object in motion will stay in motion with a constant velocity.
acceleration is directly proportional to the magnitude of the force acting on it and inversely proportional to the mass of the object.
whenever an object is falling, gravity pulls it down.
8. When one figure skater pushes on another, both skaters move in opposite directions. Which of Newton's laws of motion best explains why this occurs?
Newton's First Law
Newton's Second Law
Newton's Third Law
Newton's Fourth Law
9. Which of the following would not be an action-reaction pair according to Newton's third law of motion?
An oar pushes the water, and the water pushes the oar.
A dog wags its tail, and the tail wags the dog.
A missile pushes a gas, and the gas pushes the missile.
A boy sits in a chair, and the floor pushes the boy.
10. A toy car is moving in a straight line at a constant speed. What will happen to the car if a force is applied to it in the opposite direction of its motion?
The car will continue to move in a straight line at a constant speed.
The speed of the car will decrease.
The car will turn.
The speed of the car will increase
11. If two opposite forces act on a stationary object at the same time, and one pushes north at 16 newtons and the other pushes south at 12 newtons, which way will the object move?
It will not move.
east or west
north
south
12. Forces that are equal in magnitude but opposite in direction will:
have no effect on the motion of an object.
cause an object to change direction of motion.
cause an object to increase its speed.
cause an object to decrease its speed.
13. When a basketball is dropped to the floor, it bounces back up to the player's hand. Which of Newton's laws best explains why this occurs?
Newton's First Law
Newton's Second Law
Newton's Third Law
Newton's Fourth Law
14. If two opposite forces act on a stationary object at the same time, and one is stronger than the other, which way will the object move?
It will move toward the stronger force.
It will move toward the weaker force.
It will move at right angles to the two forces.
It will not move.
15. Which of the following best completes this sentence? In every interaction, forces occur in ___________________.
specific places
single units
one direction only
pairs
16. A balloon is inflated but not tied on its end. What causes it to move through the air when released?
Escaping air pushes on outside air and moves the balloon.
The shrinking of the balloon produces a shrinking force and pushes the balloon upward.
As air leaves the balloon, the internal pressure drops. The higher air pressure outside the balloon pushes it through the air.
Air escaping from the opening surrounds the balloon and pushes it away from the opening.
17. Suppose that you strike a nail with a hammer. What effect does the nail have on the hammer?
The nail has no effect at all on the hammer.
The nail pushes back against the hammer.
The nail gives the hammer momentum.
The nail transfers energy to the hammer.
18. According to Newton's third law, which statement describes why it is difficult to walk on an icy pond?
Your shoes push against the ice, but the ice cannot push your shoes.
Extremely low friction between your shoes and the ice eliminates traction to move you forward.
The ice is cold so it crumbles as you push against it.
The ice melts under your shoes, making it much more slippery.
19. Suppose a rock is sitting on a table. Which statement below best describes the forces involved?
No forces are acting on the rock or table because neither is moving.
The rock is exerting a downward force on the table, but the table is not exerting a force.
The table is exerting an upward force on the rock, but the rock is not exerting a force.
The rock is exerting a downward force on the table, and the table is exerting an upward force on the rock.
20. Forces occur in pairs. If the first one is called the action force, the second would be the___________.
moving force
resistance force
reaction force
normal force
21. Which way does a swimmer push to move forward in the water?
to the right
to the left
forward
backward
22. Which is the reason a boat bounces off the dock when docking?
When the boat exerts a force on the dock, the dock exerts an equal reactive force on the boat.
The boat and the dock repel each other with equal forces.
Since the dock does not move, it exerts more force than the boat.
The momentum of the dock is transferred to the boat.
23. When the net force applied to a rocket is tripled, its acceleration will be __________.
doubled
tripled
unaffected
one-third
