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 5.5 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 = 5.5 kgm = 4 gv = 600 m/s

V = m/s

2.Easy

A 0.3 kg ball at rest is kicked. The foot pushes it with an average force of 700 N for 2 ms. Find the speed v of the ball just after the kick.

m = 0.3 kgF_avg = 700 NΔt = 2 ms

v = m/s

3.Medium

A 3.5 kg glider moving at 3 m/s makes a perfectly elastic head-on collision with a 3 kg glider at rest on a frictionless track. Find the velocity v′₂ of the second glider after the collision.

m₁ = 3.5 kgm₂ = 3 kgv₁ = 3 m/sv₂ = 0

v′₂ = m/s

4.Medium

A 2 kg glider moving at 4 m/s makes a perfectly elastic head-on collision with a 3 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 kgm₂ = 3 kgv₁ = 4 m/sv₂ = 0

v′₁ = m/s

5.Hard

A 0.3 kg ball hits a wall at 17 m/s and bounces straight back at 20 m/s. The contact lasts 50 ms. Find the average force F_avg of the wall on the ball.

m = 0.3 kgv_in = 17 m/sv_out = 20 m/sΔt = 50 ms

F_avg = N

6.Hard

A 0.6 kg ball hits a wall at 14 m/s and bounces straight back at 15 m/s. The contact lasts 25 ms. Find the average force F_avg of the wall on the ball.

m = 0.6 kgv_in = 14 m/sv_out = 15 m/sΔt = 25 ms

F_avg = N

Answer key

1. V = 0.4364 m/s
2. v = 4.667 m/s
3. v′₂ = 3.231 m/s
4. v′₁ = −0.8 m/s
5. F_avg = 222 N
6. F_avg = 696 N

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