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Physical Science Homework Problems
Richard Goode
PHSC P112
Chapter 2 Motion
1. What is the average speed of car that travels 184 km in 2.3 hours?
2. What is the average speed of a car that travels 35 km in 20 minutes?
3. How long will it take a canon ball traveling at 300 m/s to reach a target 1500 m away?
4. Light travels at a speed of 3 x 108 m/s in space. If on a given day it takes 3.2 minutes for a radio
signal to travel from Mars to the Earth, how far apart are the two planets at this time?
5. If the speed of sound is 340 m/s and you hear thunder 5.5 seconds after you see the flash, how
far away was the lightening?
6. A car travels for 3 hours at 75 km/h and then at 100 km/h for the next hour. What is the average
speed of the car for the entire trip?
7. What is the average acceleration of a truck that accelerates from rest to 25 m/s in 10 seconds?
8. How long will it take a car to accelerate from 5 m/s to 15 m/s with an acceleration of 2.5 m/s 2?
9. How far will a car travel if it accelerates from rest at 2.7 m/s2 for 25.7 seconds?
10. How far will a car travel if it accelerates from 4.5 m/s at 2.7 m/s 2 for 25.7 seconds?
11. What is the weight of a 65 kg person on earth?
12. What force is needed to accelerate a 3.7kg bicycle at 2.8 m/s2?
13. What would be the acceleration of a 2.0 kg toy car when an unbalanced force of 3.7 N is applied?
14. What is the acceleration of a car that slows from 28 m/s to 6 m/s in 4.2 s?
15. A ball travels straight up for 4s before falling. What was the original speed of the ball?
16. A rock is dropped into a well and you see it hit the water 6s later. How deep is the well? What
was the speed of the rock as it hit the water?
17. What is the momentum of a 120kg football player traveling at 9m/s?
18. An airplane weighing 27355N is traveling at 75m/s. What is the airplane’s momentum?
19. A 250 kg cannon fires a 2 kg cannonball at 300 m/s. What is recoil velocity of the cannon?
20. An astronaut and equipment weigh 4410N on earth. While weightless in space, the astronaut
throws a 25kg bag of tools at 5m/s. What is the resulting velocity of the astronaut?
21. A 2500kg airplane accelerates from 70 m/s to 110 m/s in 25s. What is the force on the airplane?
22. What is the centripetal acceleration of a 1.2kg ball on the end of a 1.3m string traveling at 2.4
m/s? What is the centripetal force?
Thought Questions
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Can gravity act in a vacuum? Explain
Is it possible for your car and a fully loaded truck to have the same momentum? Explain.
Can your weight change if your mass remains a constant? Explain.
Describe how a rocket blasting off from the earth works.
Describe the motion of a ball dropped from a moving car.
A father and his 8 year old son are on very slick ice. They face each other put their hands
together and push. Describe what happens.