Momentum and Collisions Practice 2
10 problems · instant feedback · full explanations
In an isolated system total momentum is always conserved. Classify the collision first (elastic, inelastic, perfectly inelastic), then write the momentum equation.
Q1.
In a perfectly elastic collision, what is conserved?
Multiple choice · Easy
Q2.
A 2 kg ball moving at 3 m/s hits an identical stationary ball in a perfectly elastic head-on collision. What is the second ball's velocity afterward?
Numerical answer (m/s) · Medium
Q3.
A 1200 kg car at 10 m/s rear-ends a stationary 1500 kg car and they stick together. What is their joint speed?
Numerical answer (m/s) · Medium
Q4.
Impulse is defined as:
Multiple choice · Easy
Q5.
A 200 N force acts on a 0.5 kg ball for 0.05 s. By how much does the ball's speed change?
Numerical answer (m/s) · Medium
Q6.
Gun recoil is best explained by:
Multiple choice · Easy
Q7.
Total momentum is conserved in all collisions of an isolated system.
True / False · Medium
Q8.
Kinetic energy is conserved in an inelastic collision.
True / False · Easy
Q9.
A 3 kg object moving east at 4 m/s collides with a 2 kg object moving west at 6 m/s and they stick. What is the final velocity? (East positive, m/s.)
Numerical answer (m/s) · Hard
Q10.
Airbags reduce injury mainly by:
Multiple choice · Medium