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 = 32 kgF = 80 Nμ = 0.2a = ?

A 32 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 = 32 kgF = 80 Nμ = 0.2g = 9.81 m/s²
a = m/s²
2.Easy
m = 18 kgF = 40 Nμ = 0.1a = ?

An 18 kg crate is pushed across a floor with a horizontal force of 40 N. The coefficient of kinetic friction is 0.1. Use g = 9.81 m/s². Find the acceleration a of the crate.

m = 18 kgF = 40 Nμ = 0.1g = 9.81 m/s²
a = m/s²
3.Medium
boxv₀ = 2 m/sμ = ?

A box slides across a level floor with an initial speed of 2 m/s and comes to rest after 0.82 m. Use g = 9.81 m/s². Find the coefficient of kinetic friction μ.

v₀ = 2 m/sd = 0.82 mg = 9.81 m/s²
μ =
4.Medium
15 kg20°F = 100 Nμ = 0.4

A 15 kg sled is pulled across level snow by a rope at 20° above the horizontal with a force of 100 N. The coefficient of kinetic friction is 0.4. Use g = 9.81 m/s². Find the acceleration a of the sled.

m = 15 kgF = 100 Nθ = 20°μ = 0.4g = 9.81 m/s²
a = m/s²
5.Hard
7 kg1 kgTF = 145 Nμ = 0.15

Two blocks on a level floor are joined by a light horizontal string. A horizontal force of 145 N pulls the front 1 kg block; the 7 kg block is towed behind. The coefficient of kinetic friction is 0.15 for both blocks. Use g = 9.81 m/s². Find the tension T in the connecting string.

m1 = 7 kgm2 = 1 kgF = 145 Nμ = 0.15g = 9.81 m/s²
T = N
6.Hard
m1​ = 9 kg2.5 kgno friction

A 9 kg block on a horizontal table is connected by a light string over a frictionless pulley to a hanging 2.5 kg mass. The table is frictionless. Use g = 9.81 m/s². Find the tension T in the string.

m1 = 9 kgm2 = 2.5 kgμ = 0g = 9.81 m/s²
T = N

Answer key

  1. 1. a = 0.538 m/s²
  2. 2. a = 1.241 m/s²
  3. 3. μ = 0.2486
  4. 4. a = 3.253 m/s²
  5. 5. T = 126.9 N
  6. 6. T = 19.19 N

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