The two toy cars shown in the figure, with masses as given in the figure, (Figur

Question

The two toy cars shown in the figure, with masses as given in the figure, (Figure 1) are ready to race. Both cars begin from rest. For each question, state whether the correct answer is car A, car B, or whether the two cars have equal values for the parameter in question.

For the next three parts assume that the cars' motors supply the same force to each car over the course of a 1.0-meter race.

Part A

Which car crosses the finish line 1.0 m away first?

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Part B

Which car has the larger kinetic energy when it crosses the finish line 1.0 m away?

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Part C

Which car has a larger momentum when it crosses the finish line 1.0 m away?

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In the the next three parts we analyze a different type of race, in which the cars' motors supply the same force to each car over the course of a 10-second race.

The two toy cars shown in the figure, with masses as given in the figure, (Figure 1) are ready to race. Both cars begin from rest. For each question, state whether the correct answer is car A, car B, or whether the two cars have equal values for the parameter in question.

For the next three parts assume that the cars' motors supply the same force to each car over the course of a 1.0-meter race.

Part A

Which car crosses the finish line 1.0 m away first?

Which car crosses the finish line 1.0  away first? Car A wins Car B wins Both cars cross the finish line at the same time.

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Part B

Which car has the larger kinetic energy when it crosses the finish line 1.0 m away?

Which car has the larger kinetic energy when it crosses the finish line 1.0  away? Car A Car B Both cars have the same kinetic energy.

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Part C

Which car has a larger momentum when it crosses the finish line 1.0 m away?

Which car has a larger momentum when it crosses the finish line 1.0  away? Car A Car B Both cars have the same momentum.

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In the the next three parts we analyze a different type of race, in which the cars' motors supply the same force to each car over the course of a 10-second race.

Explanation / Answer

A) car B is crosses first because it has low mass.

B) by the work energy theorem W = change in kinetic energy, work done is same because same force and same disance travelled, so car A and car B have same kinetic energy.

(c) p??m so lager mass has a lager momentum, so car A has larger momentum.

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