3. Which of the following shows the presence of friction?
A. cars continuously roll down hills C. people stay in place as they move
B. things fall off on smooth surfaces D. cars stop when the driver steps on the brakes

4. How distance between two objects affects the pull of gravity?
A. the lesser the distance, the lesser the gravitational pull between them
B. the greater the distance, the lesser the gravitational pull between them
C. the greater the distance, the greater the gravitational pull between them
D. the gravitational pull between them depends on their weights

5. Why does a car travel faster in going down than in going up? It is .
A. pushed by the wind C. moving toward gravity
B. moving against the gravity D. pulled by the weight of the car

B. Modified True or False.
Write True if the statement is correct and change the underlined word/s if it is wrong to make it correct.

_ 6. Gravity is a contact force that acts between two separate objects.
_ 7. Gravity on the moon is less than the gravity on Earth.
_ 8. Friction keeps objects from sliding off surfaces.
_ 9. Friction is the force that opposes the push of gravity.
_ 10. Gravitational pull between objects increases as the distance between them decreases.