Pearson 1st Nine Weeks ReView

For which one of the following motions is the object’s displacement different than the distance traveled?

• A car accelerates from rest to a high speed.

• After a home run, a baseball player runs all the way around the bases.

• A buggy car moves across the floor at a constant speed.

Which one of the following objects has a average speed of 20 mi/hour?

• A car moves a distance of 20 miles and is 20 miles from the starting point after 4 hours.

• A car moves a distance of 40 miles and is 20 miles from the starting point after 1 hour.

• A car moves a distance of 40 miles and is 20 miles from the starting point after 2 hours.

• A car moves a distance of 40 miles and changes its velocity by 20 mi/hr after 1 hour.

Which of the following objects is accelerating? Select in all that apply.

• A car is skidding to a stop.

• A ball is following a curved path through the air.

• A student walks down the hallway at a constant speed.

An object is moving rightward and slowing down. Its velocity is directed ______ and its acceleration is directed _____.

• rightward, leftward

• rightward, rightward

• leftward, rightward

• leftward, leftward

An object has an acceleration that is directed in the same direction as its motion. What is true of the object?

• It is moving in a circle.

• It is slowing down.

• It is moving at a constant speed.

• It is moving vertically.

• It is speeding up.

An object is moving east with a constant speed of 30 m/s for 5 seconds. What is the object’s acceleration?

• 0 m/s²

• 30 m/s²

• 6 m/s²

• 150 m/s²

A car that is moving in a straight line has an acceleration of 8.0 m/s² for 4.0 seconds. Which one of the following is true of this car?

• The car is moving with a speed of 8.0 m/s for 4.0 seconds.

• The car is moving with a speed of 32.0 m/s for 4.0 seconds.

• The car is changing its speed by 8.0 m/s in 4.0 seconds.

• The car is changing its speed by 32.0 m/s in 4.0 seconds.

Which one of the graphs describes an object that is moving from slow to fast?

• A

• B

• C

• D

A scalar is a quantity that is fully described by ____.

• both its magnitude and its direction

• magnitude alone

• both its distance and its speed

• both its displacement and its velocity

• none of these

A vector is a quantity that is fully described by ____.

• both its magnitude and its direction

• magnitude alone

• both its distance and its speed

• both its displacement and its velocity

• none of these