Speed-Velocity-Acceleration

What is the speed of an object at rest?

• 0.0 m/s

• 1.0 m/s

• 9.8 m/s

• 9.81 m/s

Which of the following situations represents a negative displacement? (Assume positive position is upward)

• A cat stands on a tree limb.

• A cat jumps from the ground onto a tree limb.

• A cat jumps from a lower tree limb to a higher one.

• A cat jumps from a tree limb to the ground.

Which of the following units is the SI unit of velocity?

• meter

• meter * second

• meter per second

• second per meter

A toy car rolls from +3 m to +5 m. Which of the following statements is true?

• x_f = +3 m

• x_i = +3 m

• Displacement = +3 m

• v_avg = 3 m/s

Acceleration is defined as

• rate of displacement.

• the rate of change of displacement.

• the change in velocity.

• the rate of change of velocity.

What is the SI unit of acceleration?

• m/s

• m²/s

• m/s²

• m·s²

When a car’s velocity is positive and its acceleration is negative, what is happening to the car’s motion?

• The car slows down.

• The car speeds up.

• The car travels at constant speed.

• The car remains at rest.

Which of the following is the equation for average velocity?

• velocity = displacement / time

• velocity = time / displacement

• velocity = displacement * time

• velocity = (v_i - v_f) / 2

Which of the following is the equation for acceleration?

• acceleration = time / velocity

• acceleration = velocity / time

• acceleration = velocity * time

• acceleration = (v_i - v_f) / (t_i - t_f)

When a car´s velocity is negative and its acceleration is negative, what is happening to the car´s motion?

• The car slows down.

• The car speeds up.

• The car travels at constant speed.

• The car remains at rest.