Which statement correctly compares his motion during the first 10 minutes to his motion during the last 10 minutes?

Question

(1 point)
Responses

His acceleration increases during the first 10 minutes and decreases during the last 10 minutes.
His acceleration increases during the first 10 minutes and decreases during the last 10 minutes.

He is speeding up during the first 10 minutes and slowing down during the last 10 minutes.
He is speeding up during the first 10 minutes and slowing down during the last 10 minutes.

He is going faster and in a different direction during the first 10 minutes than in the last 10 minutes.
He is going faster and in a different direction during the first 10 minutes than in the last 10 minutes.

He is going slower and in a different direction during the first 10 minutes than in the last 10 minutes.

Answer 1

To accurately determine which statement best compares the motion during the first 10 minutes to the last 10 minutes, we need more specific information about the motion.

However, if we consider the general meanings of the statements provided:

1. Acceleration Comparison: This statement focuses on how acceleration changes, which could be important if there are specific conditions that lead to changes in acceleration.

2. Speeding up vs. slowing down: This implies a change in velocity, suggesting that the object was initially accelerating and then began to decelerate.

3. Speed and Direction: This is a comparison of both speed and directional change, indicating a shift in the object's motion characteristics.

4. Going slower in a different direction: Similar to the previous statement but indicates a reduction in speed along with a directional change.

To select the correct response, we would require explicit details about how the object's speed, direction, or acceleration changes over the 20-minute period in question.

If you have additional context about the way the object is moving during those timeframes, please provide that, and I can help you choose the most appropriate statement. Otherwise, based on general motion analysis principles:

• If the object is moving in a similar direction but at differing speeds, the comparison would likely be focused on whether it is speeding up or slowing down.
• If direction is also changing, then those comparisons could be valid as well.

Based on the information given, if it is known that there is a speeding up and slowing down (without information on direction), the safest assumption might lean towards the second option.

Ultimately, without additional context, no single statement can be definitively chosen as correct.

Answer 2

What does a horizontal line on a position-time graph indicate about the object?(1 point)
Responses

The object has a position of zero.
The object has a position of zero.

The object is accelerating.
The object is accelerating.

The object remains still.
The object remains still.

The object has a constant, nonzero velocity.

Answer 3

A horizontal line on a position-time graph indicates that the object remains still. This is because the position does not change over time; thus, the object is not moving.

Therefore, the correct response is:

The object remains still.

Answer 4

A force acts on an object. Which option describes an action that could prevent the object from moving?(1 point)
Responses

a force applied in the opposite direction with a greater magnitude at the same time
a force applied in the opposite direction with a greater magnitude at the same time

a force applied in the same direction with a greater magnitude at the same time
a force applied in the same direction with a greater magnitude at the same time

a force applied in the opposite direction with the same magnitude at the same time
a force applied in the opposite direction with the same magnitude at the same time

a force applied in the same direction with the same magnitude at the same time
a force applied in the same direction with the same magnitude at the same time

Answer 5

To prevent an object from moving, you would need to apply a force that counteracts the force already acting on the object.

The correct response would be:

a force applied in the opposite direction with a greater magnitude at the same time.

This means that if the original force trying to move the object is smaller than the opposing force, the object will not move.

Answer 6

Which option is the force with the greatest magnitude?(1 point)
Responses

the force needed to lift a chair
the force needed to lift a chair

the force needed to lift a textbook
the force needed to lift a textbook

the force needed to lift a hairbrush
the force needed to lift a hairbrush

the force needed to lift a pencil

Answer 7

The force required to lift an object is directly related to its weight, which depends on its mass. Among the options given:

• The force needed to lift a chair (which typically has a larger mass compared to the others) would generally be greater than the force required to lift a textbook, hairbrush, or pencil.

Therefore, the option with the greatest magnitude of force is:

the force needed to lift a chair.

Answer 8

A box is against a wall. A person pushes on the box, but the box does not move. Is this situation an example of a force?(1 point)
Responses

No, this is not an example of a force because the box did not move.
No, this is not an example of a force because the box did not move.

Yes, this is an example of a force because a force is a push or pull.
Yes, this is an example of a force because a force is a push or pull.

Yes, this is an example of a force because gravity is pulling the box down.
Yes, this is an example of a force because gravity is pulling the box down.

No, this is not an example of a force because a force pulls an object

Answer 9

The correct response is:

Yes, this is an example of a force because a force is a push or pull.

In this situation, even though the box does not move, the person is still exerting a force on it. The lack of movement indicates that there is another force (likely the normal force from the wall) counteracting the push, but that does not mean that a force was not applied.

Answer 10

Which situation describes a non-contact force changing the speed of an object?(1 point)
Responses

a bicycle accelerating as the rider pedals more quickly
a bicycle accelerating as the rider pedals more quickly

a gust of wind blowing a leaf away
a gust of wind blowing a leaf away

a ball accelerating as it rolls down a hill
a ball accelerating as it rolls down a hill

a drawer opening when a user pulls the handle

Answer 11

The situation that best describes a non-contact force changing the speed of an object is:

a gust of wind blowing a leaf away.

This is an example of a non-contact force (the wind is exerting a force on the leaf without physical contact), which causes the leaf to accelerate and change its speed. The other options involve forces that require contact (such as pedaling, gravity acting on the ball, and pulling the handle of the drawer).