11. Why it is difficult to push a bed towards the other side of the room?
A. Momentum
B. Gravity
C. Friction
D. Deceleration

12. Gravity and magnetism are kind of what forces?
A.Frictional
B. Non-Contact
C. Contact
D. Momentum

13. How can you tell if an object is receiving unbalanced forces?
A.Speeds up
B. Slows down
C. Change direction
D. Any of the three combined

14 The amount of force that gravity has on an object is affected by what factors?
A. The object's mass.
B. The object's distance from the gravitational force,
C. The object's height.
D. Both A and B.

15. Blue bumper car, traveling east with a force of 100 N, runs into a yellow bumper car traveling west with a force of 300 N. Because the net force will be -200 N. one of the cars will be pushed backward. Which one?
A.Blue
B. Yellow
C. none
D. Both​