II. MULTIPLE CHOICE
Directions: Read the questions carefully and choose the letter of the best answer. Encircle the
letter of the correct/best answer.
1. All of the following are manifestations of the third law of motion EXCEPT.
a. Rowing a boat
b. Rocket launch c. Falling object d. Diving on a diving board
2. As you sit in your chair and study your physics (presuming that you do), your body exerts a downward
force on the chair. The reaction force to the force you exert on the chair is
a. the force of your body pulling the Earth upwards c. the force of the Earth pushing you upward
b. the force of the chair pushing you upward
d. none of the these
3. When you drive your bicycle off the road, the tire of the bicycle pushes the road. The action force is
coming from the tire and the reaction force is given by the
a. road
b. pedal
C. feet
d. bicycle
4. A ball hit the floor with a force of 10N. How much force will be exerted by the floor on the ball and in what
direction?
a. 10N, downward
b. 10N, upward c. 10N, left
d. 10N, right
5. According to Newton's third law, every force is accompanied by an equal and opposite reaction force.
The reason that these forces do not cancel each other is
a. the two forces act upon different objects; only forces on the same object can balance each other
b. the two forces are not always in the same direction
c. the action force acts for a longer time period
d. all of the above​