Question

name:
class/ section:
date:
forces and motion quarter test
part i. multiple choice (10 pts)
choose and encircle the letter of the correct answer.

1. what does position tell us about an object?

a. how fast it moves b. where it is located relative to a reference point
c. how much mass it has d. its direction of motion

1. what indicates that an object is in motion?

a. its position changes relative to a reference point b. it stays in one place
c. it is at rest d. it is balanced

1. speed is calculated using which formula?

a. distance + time b. mass × acceleration
c. force + mass d. velocity × time

1. which of the following best describes velocity?

a. speed with direction b. change in distance
c. force per unit mass d. constant motion

1. acceleration can be caused by which of the following?

a. change in speed or direction b. constant velocity
c. balanced forces d. equal forces in opposite directions

1. a force is defined as:

a. a push or a pull on an object b. the energy of motion
c. the mass of an object d. the distance traveled per time

1. newtons first law is also known as the law of:

a. force b. inertia
c. gravity d. motion

1. according to newtons second law, acceleration depends on:

a. speed and time b. mass and force
c. distance and direction d. weight and height

1. in an elastic collision:

a. objects bounce and conserve kinetic energy
b. objects stick together and lose energy
c. gravity increases
d. energy disappears completely

1. the gravitational force between two objects increases when:

a. their mass increases b. they are farther apart
c. one is stationary d. their distance increases

Explanation:

1. Position is about location relative to a reference point.
2. Motion is indicated by position change relative to a reference point.
3. Speed formula is \( \text{Speed}=\frac{\text{Distance}}{\text{Time}} \), but among options, no correct one (assuming typo in options, if A was Distance/Time).
4. Velocity is speed with direction.
5. Acceleration is due to change in speed or direction.
6. Force is a push or pull.
7. Newton's First Law is law of Inertia.
8. Newton's Second Law: \( F = ma\) (acceleration depends on mass and force).
9. In elastic collision, objects bounce and conserve kinetic energy.
10. Gravitational force \( F=\frac{Gm_1m_2}{r^2}\), so force increases when mass increases.

Answer:

1. B. Where it is located relative to a reference point
2. A. Its position changes relative to a reference point
3. (Assuming A is Distance/Time) A. Distance/Time
4. A. Speed with direction
5. A. Change in speed or direction
6. A. A push or a pull on an object
7. B. Inertia
8. B. Mass and force
9. A. Objects bounce and conserve kinetic energy
10. A. Their mass increases