Here are the answers to your questions:
8. Which of the following surfaces would have the lowest amount of friction?
- d. Ice (Ice generally has lower friction compared to glass, sand, or wood.)
9. A car engine provides 2500 N of force for a car that has a mass of 1000 kg. If an engineer develops a new chassis for a car that is half as massive, what is the acceleration of the car with the new chassis?
- The mass of the new car = 1000 kg / 2 = 500 kg.
- Using Newton's second law (F = ma), we can find the acceleration (a): \( a = \frac{F}{m} = \frac{2500 , N}{500 , kg} = 5 , m/s^2 \)
- b. 5 m/s^2
10. He’s riding his skateboard down a ramp. Assume that his acceleration is 0.8 m/s². How much force does it take for him to accelerate at this rate? Zeke has a mass of 50 kg.
- Using Newton's second law (F = ma): \( F = 50 , kg \times 0.8 , m/s² = 40 , N \)
- C) 40 N
11. According to Newton's Third Law, if a hammer puts a force of 200 N on a nail, how much force does the nail put back on the hammer?
- According to Newton's Third Law, every action has an equal and opposite reaction.
- Therefore, the nail puts back a force of a. 200 N.
12. Two bodies in contact experience forces in ________.
- b. Opposite directions (According to Newton’s Third Law, the forces are equal in magnitude and opposite in direction.)
13. Dansby Swanson hits a ball with a force of 5 N. What force does the bat experience?
- According to Newton's Third Law, the bat experiences the same force in the opposite direction.
- b. 5 N
Let me know if you need any further clarification!