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 0.4 kg ball at rest is kicked. The foot pushes it with an average force of 800 N for 15 ms. Find the speed v of the ball just after the kick.

m = 0.4 kgF_avg = 800 NΔt = 15 ms

v = m/s

2.Easy

A 0.45 kg ball at rest is kicked. The foot pushes it with an average force of 600 N for 5 ms. Find the speed v of the ball just after the kick.

m = 0.45 kgF_avg = 600 NΔt = 5 ms

v = m/s

3.Medium

A 3.5 kg glider moving at 6 m/s makes a perfectly elastic head-on collision with a 2.5 kg glider at rest on a frictionless track. Find the velocity v′₂ of the second glider after the collision.

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

v′₂ = m/s

4.Medium

A 1000 kg car moving at 7 m/s runs into a stationary 1600 kg car and the two lock together. How much kinetic energy ΔK is lost in the collision?

m₁ = 1000 kgv₁ = 7 m/sm₂ = 1600 kgv₂ = 0

ΔK = J

5.Hard

A 1600 kg car runs into a parked 800 kg car. The wrecks lock together and skid 24.5 m before stopping. The coefficient of kinetic friction between tyres and road is 0.75. Use g = 9.81 m/s². Find the speed v₁ of the first car just before the collision.

m₁ = 1600 kgm₂ = 800 kgd = 24.5 mμ = 0.75g = 9.81 m/s²

v₁ = m/s

6.Hard

A 0.1 kg ball hits a wall at 26 m/s and bounces straight back at 11 m/s. The contact lasts 20 ms. Find the average force F_avg of the wall on the ball.

m = 0.1 kgv_in = 26 m/sv_out = 11 m/sΔt = 20 ms

F_avg = N

Answer key

1. v = 30 m/s
2. v = 6.667 m/s
3. v′₂ = 7 m/s
4. ΔK = 15077 J
5. v₁ = 28.48 m/s
6. F_avg = 185 N

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