Newton's Second Law and Momentum Video Lessons

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Problem: Two toy cars of mass 1110 g and 1550 g are stationary, lined up at the start line of a race. (Figure 1) in each part of this question, you will be asked to consider different quantities associated with the motion of the cars. The correct answer might be a car A, car B, or both cars might have the same value of that particular quantity.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?a. Car A winsb. Car B winsc. Both cars cross the finish line at the same time.Part BWhich car has the larger kinetic energy when it crosses the finish line 1.0 m away?a. Car Ab. Car Bc. Both cars have the same kinetic energyPart CWhich car has a larger momentum when it crosses the finish line 1.0 m away?a. Car Ab. Car Bc. Both cars have the same kinetic energy

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Problem Details

Two toy cars of mass 1110 g and 1550 g are stationary, lined up at the start line of a race. (Figure 1) in each part of this question, you will be asked to consider different quantities associated with the motion of the cars. The correct answer might be a car A, car B, or both cars might have the same value of that particular quantity.


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?

a. Car A wins

b. Car B wins

c. Both cars cross the finish line at the same time.


Part B

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

a. Car A

b. Car B

c. Both cars have the same kinetic energy


Part C

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

a. Car A

b. Car B

c. Both cars have the same kinetic energy

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Newton's Second Law and Momentum concept. You can view video lessons to learn Newton's Second Law and Momentum. Or if you need more Newton's Second Law and Momentum practice, you can also practice Newton's Second Law and Momentum practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Dubson's class at UCB.