Physics Motion Quiz 11

Describe the motion at time A.

• speeding up

• slowing down

• constant speed

• at rest

• turning around

Answer explanation

At time A, the object is slowing down, indicating a decrease in speed. This is evident as the motion is not maintaining a constant speed or accelerating, which aligns with the choice 'slowing down'.

Tags

NGSS.MS-PS3-1

Describe the motion at time B.

• speeding up

• slowing down

• constant speed

• at rest

• turning around

Answer explanation

At time B, the object is changing direction, indicating it is turning around. This means its velocity is reversing, which is distinct from speeding up or slowing down.

Describe the motion at time C.

• speeding up

• slowing down

• constant speed

• at rest

• turning around

Answer explanation

At time C, the object is increasing its speed, indicating that it is speeding up. This means the acceleration is positive, leading to a rise in velocity over time.

Tags

NGSS.MS-PS3-1

Describe the motion at time A.

• speeding up

• slowing down

• constant speed

• at rest

• turning around

Answer explanation

At time A, the object is moving at a constant speed, meaning its velocity is steady and not changing. This indicates that there is no acceleration, distinguishing it from speeding up or slowing down.

Tags

NGSS.MS-PS3-1

Describe the motion at time B.

• speeding up

• slowing down

• constant speed

• at rest

• turning around

Answer explanation

At time B, the object is slowing down, indicating a decrease in speed. This is evident as the motion transitions from faster to slower, confirming that the correct choice is 'slowing down'.

Tags

NGSS.MS-PS3-1

Describe the motion at time C.

• speeding up

• slowing down

• constant speed

• at rest

• turning around

Answer explanation

At time C, the object is speeding up, indicating an increase in velocity. This suggests that the forces acting on it are causing it to accelerate rather than decelerate or maintain a constant speed.

Tags

NGSS.MS-PS3-1

Describe the motion at time D.

• speeding up

• slowing down

• constant speed

• at rest

• turning around

Answer explanation

At time D, the object is slowing down, indicating a decrease in speed. This suggests that the forces acting on it are opposing its motion, leading to a reduction in velocity.

Tags

NGSS.MS-PS3-1

Describe the motion at time E.

• speeding up

• slowing down

• constant speed

• at rest

• turning around

Answer explanation

At time E, the object is not moving, which means it is at rest. This indicates that its speed is zero, confirming that it is not speeding up, slowing down, or moving at a constant speed.

In the following Speed vs. Time graph, which object was going fastest at t = 3 seconds?

• Object X

• Object Y

• Object Z

• They all have the same speed.

Answer explanation

At t = 3 seconds, the Speed vs. Time graph shows that all objects X, Y, and Z have the same speed. Therefore, the correct answer is that they all have the same speed.

Tags

NGSS.MS-PS3-1

A speed versus time graph for a bicycle is shown. When is the bicycle at rest (not moving)?

• 1 to 2 sec

• 2 to 3 sec

• 3 to 4 sec

• 4 to 5 sec

• not shown

Answer explanation

The bicycle is at rest when its speed is 0. If the graph does not show any time interval where the speed is 0, then the correct answer is 'not shown'.