Momentum & collisions worksheet with answers

Free printable Momentum & collisions worksheet: 6 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

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1.Easy

A 6 kg rifle, free to move, fires a 4 g bullet at 700 m/s. Both start at rest. Find the recoil speed V of the rifle.

M = 6 kgm = 4 gv = 700 m/s

V = m/s

2.Easy

A 4 kg rifle, free to move, fires a 4 g bullet at 600 m/s. Both start at rest. Find the recoil speed V of the rifle.

M = 4 kgm = 4 gv = 600 m/s

V = m/s

3.Medium

A 5 kg glider moving at 6 m/s makes a perfectly elastic head-on collision with a 1 kg glider at rest on a frictionless track. Find the velocity v′₁ of the first glider after the collision (positive in its original direction).

m₁ = 5 kgm₂ = 1 kgv₁ = 6 m/sv₂ = 0

v′₁ = m/s

4.Medium

A 2.5 kg glider moving at 6 m/s makes a perfectly elastic head-on collision with a 3.5 kg glider at rest on a frictionless track. Find the velocity v′₁ of the first glider after the collision (positive in its original direction).

m₁ = 2.5 kgm₂ = 3.5 kgv₁ = 6 m/sv₂ = 0

v′₁ = m/s

5.Hard

A 0.35 kg ball hits a wall at 15 m/s and bounces straight back at 7 m/s. The contact lasts 25 ms. Find the average force F_avg of the wall on the ball.

m = 0.35 kgv_in = 15 m/sv_out = 7 m/sΔt = 25 ms

F_avg = N

6.Hard

A 0.4 kg ball hits a wall at 19 m/s and bounces straight back at 8 m/s. The contact lasts 40 ms. Find the magnitude of the impulse J the wall gives the ball.

m = 0.4 kgv_in = 19 m/sv_out = 8 m/sΔt = 40 ms

J = N·s

Answer key

1. V = 0.4667 m/s
2. V = 0.6 m/s
3. v′₁ = 4 m/s
4. v′₁ = −1 m/s
5. F_avg = 308 N
6. J = 10.8 N·s

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