Collisions in two dimensions Quiz
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5 questions, one answer each
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1. A 2.0 kg trolley moving at 3.0 m s⁻¹ collides with a stationary 1.0 kg trolley and they stick together. What is their common speed?
- A. 3.0 m s⁻¹
- B. 1.5 m s⁻¹
- C. 2.0 m s⁻¹
- D. 4.5 m s⁻¹
2. A particle of mass 2.0 × 10⁻²⁶ kg has momentum 4.0 × 10⁻²⁰ kg m s⁻¹. What is its kinetic energy?
- A. 8.0 × 10⁻¹⁴ J
- B. 4.0 × 10⁻¹⁴ J
- C. 2.0 × 10⁻¹⁴ J
- D. 1.6 × 10⁻³⁹ J
3. In a two-dimensional collision, one object is initially at rest. Which statement about momentum perpendicular to the initial direction of the moving object is correct?
- A. It is conserved and the total is zero
- B. It increases after the collision
- C. It is lost
- D. It equals the parallel momentum
4. A collision between two objects is inelastic. Which quantity is not conserved?
- A. Total momentum
- B. Total kinetic energy
- C. Total energy
- D. Total mass
5. Two objects of different mass have the same momentum. Which has the greater kinetic energy?
- A. The one with the larger mass
- B. They have equal kinetic energy
- C. It depends on the direction
- D. The one with the smaller mass