oaquin and Susanna are pushing a cart containing sports equipment along one side of their local sports field.

Question

In section A, the cart is speeding up.
In section B, the cart is rolling at a constant speed.
In section C, the cart is speeding up again.
In section D, the cart is rolling at a new constant speed.
Then they think about how this data relates to what they learned in class about kinetic energy.

Study the graph and then answer the questions.

Question 1
a. In which section or sections is the cart's kinetic energy increasing?

You might need to choose more than one answer.

(1 point)
Responses

section A
section A

section B
section B

section C
section C

section D
section D

section E
section E
Question 2
b. How would you describe the cart's kinetic energy in section B?(1 point)
Responses

The cart has a constant kinetic energy.
The cart has a constant kinetic energy.

The cart has an increasing kinetic energy.
The cart has an increasing kinetic energy.

The cart has a decreasing kinetic energy.
The cart has a decreasing kinetic energy.

The cart has no kinetic energy.
The cart has no kinetic energy.
Question 3
c. Describe the cart's motion in section E.(1 point)
Responses

The cart is getting slower.
The cart is getting slower.

The cart is getting faster.
The cart is getting faster.

The cart is moving at a constant speed.
The cart is moving at a constant speed.

The cart is not moving.
The cart is not moving.
Question 4
d. What is happening to the cart's kinetic energy is section E?(1 point)
Responses

The kinetic energy is increasing.
The kinetic energy is increasing.

The kinetic energy is decreasing.
The kinetic energy is decreasing.

The kinetic energy is staying the same.
The kinetic energy is staying the same.

The kinetic energy goes down and then up.
The kinetic energy goes down and then up.
Question 5
e. In sections A, B, C, and D, what causes the cart to move?(1 point)
Responses

Gravity makes the cart move.
Gravity makes the cart move.

Joaquin and Susanna transfer energy to the cart.
Joaquin and Susanna transfer energy to the cart.

The ground transfers energy to the cart.
The ground transfers energy to the cart.

Joaquin and Susanna stop pushing the cart.
Joaquin and Susanna stop pushing the cart.
Question 6
f. What is the most likely explanation for the motion of the cart in section E?(1 point)
Responses

Someone else helped Joaquin and Susanna push faster.
Someone else helped Joaquin and Susanna push faster.

The sports equipment fell out of the cart.
The sports equipment fell out of the cart.

Joaquin and Susanna stopped pushing the cart and let it roll to a stop.
Joaquin and Susanna stopped pushing the cart and let it roll to a stop.

The cart started going downhill.
The cart started going downhill.
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Answer 1

Based on the description provided, here are the answers to the questions:

Question 1
a. In which section or sections is the cart's kinetic energy increasing?
Responses:

• section A
• section C

Question 2
b. How would you describe the cart's kinetic energy in section B?
Responses:

• The cart has a constant kinetic energy.

Question 3
c. Describe the cart's motion in section E.
Responses:

• The cart is getting slower.

Question 4
d. What is happening to the cart's kinetic energy in section E?
Responses:

• The kinetic energy is decreasing.

Question 5
e. In sections A, B, C, and D, what causes the cart to move?
Responses:

• Joaquin and Susanna transfer energy to the cart.

Question 6
f. What is the most likely explanation for the motion of the cart in section E?
Responses:

• Joaquin and Susanna stopped pushing the cart and let it roll to a stop.

Feel free to ask if you have any further questions!