First slide

Kinetic friction

Question

A box is placed on the floor of a truck moving with an acceleration of 7 ms^-2 . If the coefficient of kinetic friction between the box and surface of the truck is 0.5,find the acceleration of the box relative to the truck

Moderate

A

1.7ms^-2
B

2.1ms^-2
C

3.5ms^-2
D

4.5ms^-2

Solution

$f_{k} = μ_{k} N, N = mg; a^{1} = μ_{k} g, a_{rel} = a - a^{1}$

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