Chapter Test

1. A 10 kg box is pushed 5 m at 30° to horizontal with force 50 N. Compute work done.
2. A 3 kg object slides down a frictionless ramp of 4 m height. Find speed at bottom.
3. Explain the difference between positive and negative work with examples.
4. A force of 20 N acts along 6 m; friction resists with 5 N. Find net work done and final speed of a 2 kg block starting from rest.
5. Discuss energy transformations in a pendulum from highest to lowest point.
6. A 5 kg box slides down a ramp with µk = 0.2. Ramp height = 3 m, length = 5 m. Find speed at bottom.
7. Why is work a scalar quantity? Provide examples from daily life.
8. Compute power delivered if the 50 N force in problem 1 acts over 2 seconds.
9. A roller coaster car of 400 kg starts at 10 m height. Friction does 500 J of work. Find speed at 2 m height.
10. Describe a real-life scenario where work is zero but forces act on an object.