1. Why does a ball thrown into the air tend to fall back to the ground?
A.Gravity causes the ball to fall.
C. Acceleration causes the ball to move faster. B.The air pulls the ball to the ground.
D. The mass of the ball causes the ball to drop. 2. Which will happen if a ball is thrown upward? A. The ball remains in the air.
C. The ball will go back to the ground.
B. The ball moves in a curve path.
D. The ball continues to move upward.
3. Imagine the Earth lost its gravity. What will happen to objects on it?
A. All objects will float in the air.
C. Everything will just stay in place.
B. All objects will fall on the ground.
D. Only the lighter objects will float in the air.
4. Which of the following keeps all objects on Earth stay on the ground?
A. Energy B. Gravity C. Mass D. Speed
5. How will planets move if there is no gravity in the universe?
A. Nothing will happen.
C. Planets will not be attracted to each other.
B. Planet will stay in orbit.
D. All planets will move to the eastern direction. 6. Who discovered gravity when he saw an apple falling to the ground?
A. Albert Einstein
B. Galileo Galilei
C. Isaac Newton
D. Nicholas Copernicus
7. Gravity affects all objects in the universe.
A. True B. False C. Maybe D. It depends
8. Objects with greater gravitational pull slowdown the movement or motion of another object near it.
A. True B. False C. Maybe D. It depends
9. Which characteristic of an object affects its gravity?
A. Color B. Mass C. Position D. Shape
10. How does gravity affect the movement of falling objects?
A. It increases the movement of falling objects. B. It slows down the movement of falling objects. C. It does not affect the movement of falling objects.
D. It neither slows down nor increases the movement of falling objects.
11. Without gravity, everything on the Earth’s surface will float in the atmosphere.
A. True B. False C. Maybe D. It depends
12. The theory of gravity was proposed by .
A. Archimedes B. Galileo Galilei C. Isaac Newton D. Nicholas Copernicus
13. puts all things on Earth and the universe in order.
A. Mass B. Mass C. Friction D. Gravity
14. Objects that are thrown upward on Earth eventually .
A. Fall Down B. Stay Upward C. Float D. Move away from each other
15. What is the direction towards which objects on Earth are pulled by the Earth?
A. Back B. Center C. Front D. Side
16. Which of the following statements is true?
A. Friction makes an object slide.
B. Gravity pushes an object upward.
C. Force is needed to stop the object.
D. An object in motion will remain in motion.
17. Why does a car travel faster in going down than in going up?
A. It is moving against gravity.
B. It is being pushed by the wind.
C. It is moving toward gravity.
D. It is being pulled by the weight of the car.
18. Why did a ball thrown to the air fall back to the ground?
A. Gravity caused the ball to fall.
B. Air caused the ball to fall on the ground.
C. Acceleration caused the ball to move faster D. The weight of the ball mad it move faster.
19. A boy is playing with a toy sledge. In which surface will it travel fastest?
A. the carpet
C. the wet floor
B. the rough floor
D. the polished floor
20. Which of the following is an example of increasing friction?
A. Polishing the floor
B. Squirting oil into the door hinge
C. Waxing the underneath of ice skates
D. Spreading sand on a wet road