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
0.45 kgv = ?

A 0.45 kg ball at rest is kicked. The foot pushes it with an average force of 450 N for 8 ms. Find the speed v of the ball just after the kick.

m = 0.45 kgFavg = 450 NΔt = 8 ms
v = m/s
2.Easy
5 kg300 m/sV = ?

A 5 kg rifle, free to move, fires a 4 g bullet at 300 m/s. Both start at rest. Find the recoil speed V of the rifle.

M = 5 kgm = 4 gv = 300 m/s
V = m/s
3.Medium
3 kg8 m/s3.5 kg

A 3 kg glider moving at 8 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′2 of the second glider after the collision.

m1 = 3 kgm2 = 3.5 kgv1 = 8 m/sv2 = 0
v′2 = m/s
4.Medium
1.5 kg9 m/s3.5 kg

A 1.5 kg glider moving at 9 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′2 of the second glider after the collision.

m1 = 1.5 kgm2 = 3.5 kgv1 = 9 m/sv2 = 0
v′2 = m/s
5.Hard
22 m/s16 m/s

A 0.3 kg ball hits a wall at 22 m/s and bounces straight back at 16 m/s. The contact lasts 25 ms. Find the average force Favg of the wall on the ball.

m = 0.3 kgvin = 22 m/svout = 16 m/sΔt = 25 ms
Favg = N
6.Hard
21 m/s19 m/s

A 0.55 kg ball hits a wall at 21 m/s and bounces straight back at 19 m/s. The contact lasts 25 ms. Find the average force Favg of the wall on the ball.

m = 0.55 kgvin = 21 m/svout = 19 m/sΔt = 25 ms
Favg = N

Answer key

  1. 1. v = 8 m/s
  2. 2. V = 0.24 m/s
  3. 3. v′2 = 7.385 m/s
  4. 4. v′2 = 5.4 m/s
  5. 5. Favg = 456 N
  6. 6. Favg = 880 N

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