First slide

Kinetic friction

Question

A 500 kg horse pulls a cart of mass 1500 kg along a level road with an acceleration of 1 m/s². If coefficient of sliding friction is 0.2, then force exerted by the earth on horse is

Moderate

A

3000N
B

4000N
C

5000 N
D

6000N

Solution

Force of friction $F_{1} = μ (m_{1} + m_{2}) g$
force producing acceleration
F₂ = (m₁ + m₂)a
Total force applied by the horse = F₁ + F₂

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