Energy and Circular Motion Exercises
Complete the following exercises.
1. A rifle with a longer barrel can fire bullets with a larger velocity than a rifle with a shorter barrel.
a. Explain this using the impulse-momentum theorem.
b. Explain this using the work-energy theorem
2. Use physics terms to explain the benefits of crumple zones in modern cars.
3. When a gun is fired at the shooting range, the gun recoils (moves backward). Explain this using the law of conservation of momentum.
4. Rank the following in terms of increasing inertia:
A. A 10,000 kg train car at rest
B. A 100 kg person running at 5 m/s
C. A 1200 kg car going 15 m/s
D. A 15 kg meteor going at a speed of 1000 m/s
