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 = 8 kgF = 60 Nμ = 0.4a = ?

An 8 kg crate is pushed across a floor with a horizontal force of 60 N. The coefficient of kinetic friction is 0.4. Use g = 9.81 m/s². Find the acceleration a of the crate.

m = 8 kgF = 60 Nμ = 0.4g = 9.81 m/s²
a = m/s²
2.Easy
7 kg12 kgF = 25 N

Two blocks of 7 kg and 12 kg sit side by side on a frictionless floor. A horizontal force of 25 N pushes on the 7 kg block, which pushes the other one. Find the acceleration a of the blocks.

m1 = 7 kgm2 = 12 kgF = 25 N
a = m/s²
3.Medium
θ = 20°a = ?m = 4 kg

A 4 kg block slides down a slope at 20° 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 = 4 kgθ = 20°μ = 0.15g = 9.81 m/s²
a = m/s²
4.Medium
15 kg25°F = 70 Nμ = 0.25

A 15 kg sled is pulled across level snow by a rope at 25° above the horizontal with a force of 70 N. The coefficient of kinetic friction is 0.25. Use g = 9.81 m/s². Find the acceleration a of the sled.

m = 15 kgF = 70 Nθ = 25°μ = 0.25g = 9.81 m/s²
a = m/s²
5.Hard
m1​ = 5 kg6 kgμ = 0.25

A 5 kg block on a horizontal table is connected by a light string over a frictionless pulley to a hanging 6 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 = 5 kgm2 = 6 kgμ = 0.25g = 9.81 m/s²
a = m/s²
6.Hard
m1​ = 10 kg3 kgno friction

A 10 kg block on a horizontal table is connected by a light string over a frictionless pulley to a hanging 3 kg mass. The table is frictionless. Use g = 9.81 m/s². Find the tension T in the string.

m1 = 10 kgm2 = 3 kgμ = 0g = 9.81 m/s²
T = N

Answer key

  1. 1. a = 3.576 m/s²
  2. 2. a = 1.316 m/s²
  3. 3. a = 1.972 m/s²
  4. 4. a = 2.27 m/s²
  5. 5. a = 4.236 m/s²
  6. 6. T = 22.64 N

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