Physics Concepts: Motion and Acceleration

What happens to the velocity of an object experiencing constant acceleration?

• It changes at a constant rate.

• It remains the same.

• It decreases to zero.

• It increases and then decreases.

What does the slope of a velocity-time graph represent for an object with constant acceleration?

• Displacement

• Acceleration

• Time

• Position

What is the definition of average acceleration?

• Change in velocity divided by the time interval

• Change in position divided by the time interval

• Change in force divided by the mass

• Change in mass divided by the velocity

What is the value of velocity (v) given in the problem?

• +75 m/s

• +50 m/s

• +100 m/s

• +25 m/s

What is the unknown variable that needs to be found in the problem?

• Δx

• v

• Δt

• t

What is the unknown variable being solved for in the example problem?

• vi

• a

• xf

• vf

What is the positive direction chosen for the coordinate axes in the example?

• To the left

• Upward

• To the right

• Downward

Which of the following is a reason to check the sign of your answer in a physics problem?

• To make sure the answer is positive

• To agree with both pictorial and physical models

• To convert units

• To find the mass

How long does it take for the driver to react and apply the brakes in the example problem?

• 0.45 s

• 4.5 s

• 18.4 s

• 1.0 s

According to the instructions for analyzing and sketching the problem, what should you label in the motion diagram?

• v and a

• x and t

• m and g

• F and d