Newton’s laws worksheet with answers

Free printable Newton’s laws 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
m = 36 kgF = 120 Nμ = 0.2a = ?

A 36 kg crate is pushed across a floor with a horizontal force of 120 N. The coefficient of kinetic friction is 0.2. Use g = 9.81 m/s². Find the acceleration a of the crate.

m = 36 kgF = 120 Nμ = 0.2g = 9.81 m/s²
a = m/s²
2.Easy
m = 12 kgF = 80 Nμ = 0.2a = ?

A 12 kg crate is pushed across a floor with a horizontal force of 80 N. The coefficient of kinetic friction is 0.2. Use g = 9.81 m/s². Find the acceleration a of the crate.

m = 12 kgF = 80 Nμ = 0.2g = 9.81 m/s²
a = m/s²
3.Medium
25 kg40°F = 110 Nμ = 0.1

A 25 kg sled is pulled across level snow by a rope at 40° above the horizontal with a force of 110 N. The coefficient of kinetic friction is 0.1. Use g = 9.81 m/s². Find the acceleration a of the sled.

m = 25 kgF = 110 Nθ = 40°μ = 0.1g = 9.81 m/s²
a = m/s²
4.Medium
θ = 25°a = ?m = 13 kg

A 13 kg block slides down a slope at 25° to the horizontal. The coefficient of kinetic friction is 0.15. Use g = 9.81 m/s². Find the acceleration a of the block along the slope.

m = 13 kgθ = 25°μ = 0.15g = 9.81 m/s²
a = m/s²
5.Hard
m1​ = 8.5 kg3 kgμ = 0.1

An 8.5 kg block on a horizontal table is connected by a light string over a frictionless pulley to a hanging 3 kg mass. The coefficient of kinetic friction between block and table is 0.1. Use g = 9.81 m/s². Find the tension T in the string.

m1 = 8.5 kgm2 = 3 kgμ = 0.1g = 9.81 m/s²
T = N
6.Hard
m1​ = 9.5 kg5.5 kgμ = 0.25

A 9.5 kg block on a horizontal table is connected by a light string over a frictionless pulley to a hanging 5.5 kg mass. The coefficient of kinetic friction between block and table is 0.25. Use g = 9.81 m/s². Find the acceleration a of the system.

m1 = 9.5 kgm2 = 5.5 kgμ = 0.25g = 9.81 m/s²
a = m/s²

Answer key

  1. 1. a = 1.371 m/s²
  2. 2. a = 4.705 m/s²
  3. 3. a = 2.672 m/s²
  4. 4. a = 2.812 m/s²
  5. 5. T = 23.93 N
  6. 6. a = 2.044 m/s²

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