A.2 Forces and momentum Quiz
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5 questions, one answer each
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1. A tennis ball of mass 0.058 kg arrives at 30 m s⁻¹ and leaves the racket at 40 m s⁻¹ in the opposite direction. The contact time is 5.0 ms. What is the average force on the ball?
- A. 116 N
- B. 580 N
- C. 812 N
- D. 4.1 N
2. A spring of spring constant 250 N m⁻¹ is stretched by 0.040 m. What is the magnitude of the restoring force?
- A. 6250 N
- B. 10 N
- C. 0.20 N
- D. 0.16 N
3. Two trolleys collide and stick together. Which statement is correct?
- A. Momentum and kinetic energy are both conserved
- B. Momentum is conserved but kinetic energy decreases
- C. Kinetic energy is conserved but momentum decreases
- D. Neither is conserved
4. A 0.20 kg stone on a string moves in a horizontal circle of radius 0.50 m at 3.0 m s⁻¹. What is the centripetal force?
- A. 1.2 N
- B. 3.6 N
- C. 0.30 N
- D. 18 N
5. A book rests on a table. What is the Newton's third law partner of the Earth's gravitational pull on the book?
- A. The normal force of the table on the book
- B. The book's gravitational pull on the Earth
- C. The book's push on the table
- D. Friction on the book