Physics Motion Quiz 10

Suppose you are in a car that is going around a curve. The speedometer reads a constant 30 mph. Which of the following is NOT true?

• You and the car are accelerating.

• Your acceleration is constantly changing.

• Your velocity is constant.

• Your direction is constantly changing.

• Your speed is constant.

A soccer ball rolls up a hill, reaches its highest point, then turns around and rolls back to its starting point. During this time the acceleration of the ball:

• is always in the opposite direction of the motion.

• is always in the same direction as the motion.

• changes with the direction of the motion.

• is always directed uphill.

• is always directed downhill.

Tags

NGSS.MS-PS2-2

Ed rides his mountain bike down a hillside as follows: During the first 3 seconds, his speed goes from 0 m/sec to 4 m/sec. After 3 seconds, Ed travels at 4 m/sec for the rest of his trip down the hill. When was Ed accelerating?

• During the first 3 seconds.

• During the entire trip.

• During the entire trip except at t = 0 sec.

• At t = 3 seconds.

• After t = 3 seconds.

A ball rolls toward a wall at constant speed, hits the wall, then rolls back at constant speed. When, if ever, is the object accelerating?

• The object accelerates when it changes direction.

• The object never accelerates because it is always traveling with constant speed.

• If the speed doesn't change when the object hits the wall, then there is no acceleration.

• Can't tell, because we need to know the actual speed of the ball.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

If an automobile’s velocity changes from 25 m/s to 15 m/s in 2 s, what is its acceleration?

• 5 m/s/s

• -5 m/s/s

• 10 m/s/s

• -10 m/s/s

An automobile accelerates at 5 m/s/s. How much time is required for the automobile to reach a speed of 30 m/s if it starts from rest?

• 0.17 s

• 5 s

• 6 s

• 150 s

Some motion data for a snail is shown in the table. What is the snail’s acceleration? Record the number without units.

Some motion data for a Honda Accord is shown in the table. What is the car’s acceleration? Record the number first with direction (no space and no comma).

A speed vs. time graph of a bicycle's motion is shown. Which statement best describes the motion of the bike?

• The bike starts from rest, then moves with a constant speed, then slows to a stop.

• The bike starts from rest because the slope is zero, then speeds up toward the origin.

• The bike is first traveling with a high constant speed, then it slows down to a stop.

• The bike is slowing down for the entire trip.

• The bike is first traveling along a flat road, then it begins to go down a hill.

Tags

NGSS.MS-PS3-1

The speed versus time data for a racing turtle is shown in the graph. What is the speed of the turtle at t = 2 minutes?

• 0.5 meter/minute

• 1.0 meter/minute

• 1.5 meters/minute

• 2.5 meters/minute

• 3.0 meters/minute

Tags

NGSS.MS-PS3-1