Energy of Motion Unit Test

Question

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Question
An athlete is practicing shotput using a 16-pound shot, and he throws it 40 feet. He then uses a 12-pound shot and throws it 50 feet. In three to four sentences, explain why there is a difference in these throws using the ideas of mass and speed and how each relates to kinetic energy.(4 points)

Short Answer Rubric (4 points)
Points Awarded Criteria
4
The answer is very clear.

The answer is fully supported by details.

There may be a few errors in grammar, usage, or mechanics. Errors do not interfere with meaning.

3
The answer is mostly clear.

The answer is supported by mostly relevant details.

There are a few errors in grammar, usage, or mechanics. Errors do not interfere with meaning.

2
The answer is somewhat clear.

Details are weak or not related.

There are some errors in grammar, usage, and mechanics. Errors interfere with meaning.

1
The answer is not clear.

There are few or no supporting details.

There are many errors in grammar, usage, and mechanics. Errors interfere with meaning.

0 The question is not answered.
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Answer 1

In these throws, the difference lies in the combination of mass and speed. The athlete is using a heavier shot in the first throw, which means it has more mass. The athlete is also throwing the shot a shorter distance. In the second throw, the athlete is using a lighter shot, so it has less mass. However, the athlete is throwing it a longer distance. The kinetic energy of an object is calculated using the formula KE = 1/2mv^2, where m is the mass and v is the velocity. In the first throw, the shot has more mass but a lower velocity, resulting in a lower kinetic energy. In the second throw, the shot has less mass but a higher velocity, resulting in a higher kinetic energy.