Physics Motion Quiz 08

The diagram represents the positions of two balls at equal time intervals. Which of the following statements is true of Ball 1 and Ball 2?

• They never have the same speed.

• They have the same speed at t = 2 seconds.

• They have the same speed at t = 3 seconds.

• They have the same speed at t = 4 seconds.

• They both have positive acceleration.

Answer explanation

At t = 3 seconds, the positions of Ball 1 and Ball 2 indicate they are moving at the same rate, confirming they have the same speed at that moment. The other options do not hold true based on the diagram.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

The diagram below shows the position of a person during six seconds of time. Choose the best description of the person's motion between t = 1 second and t = 3 seconds.

• The person was slowing down.

• The person suddenly speeds up, then starts to slow down.

• The person starts slow, then speeds up in the negative direction.

• The person began moving then stopped.

Answer explanation

Between t = 1 second and t = 3 seconds, the person's position changes at a decreasing rate, indicating they are slowing down. This aligns with the correct choice that states the person was slowing down.

Tags

NGSS.MS-PS3-1

The Position vs. Time graph represents the motion of an automobile which is:

• undergoing constant acceleration.

• traveling with a decreasing velocity.

• slowing down and then speeding up.

• traveling with a constant speed.

Answer explanation

The Position vs. Time graph indicates a curve, which signifies that the automobile is undergoing constant acceleration. This means its velocity is changing at a steady rate, unlike constant speed or decreasing velocity.

Tags

NGSS.MS-PS3-1

Describe the motion at time A.

• constant speed

• speeding up

• slowing down

• at rest

• turning around

Answer explanation

At time A, the object is moving at a constant speed, meaning it covers equal distances in equal intervals of time without acceleration or deceleration.

Tags

NGSS.MS-PS3-1

Describe the motion at time B.

• constant speed

• speeding up

• slowing down

• at rest

• turning around

Answer explanation

At time B, the object is moving at a constant speed, meaning it covers equal distances in equal intervals of time without acceleration or deceleration.

Tags

NGSS.MS-PS3-1

Describe the motion at time C.

• constant speed

• speeding up

• slowing down

• at rest

• turning around

Answer explanation

At time C, the object is moving at a constant speed, meaning it covers equal distances in equal intervals of time without accelerating or decelerating.

Tags

NGSS.MS-PS3-1

Describe the motion from A to B.

• speeding up

• slowing down

• constant speed

• at rest

Answer explanation

The motion from A to B is described as 'speeding up' because the object is increasing its velocity during this transition, indicating a positive acceleration.

Tags

NGSS.MS-PS3-1

Describe the motion from B to C.

• speeding up

• slowing down

• constant speed

• at rest

Answer explanation

The motion from B to C is described as 'constant speed' because the object maintains the same velocity throughout this segment, indicating no acceleration or deceleration.

Tags

NGSS.MS-PS3-1

Describe the motion from C to D.

• speeding up

• slowing down

• constant speed

• at rest

Answer explanation

The motion from C to D is described as slowing down because the object's speed decreases during this interval, indicating a reduction in velocity.

Describe the motion from D to E.

• speeding up

• slowing down

• constant speed

• at rest

Answer explanation

The motion from D to E is described as 'at rest' because there is no change in position over time, indicating that the object is not moving.

Tags

NGSS.MS-PS3-1