Question

A body of mass 60kg is pushed with just enough force to start it moving on a rough surface with us=0.5 and uk=0.4 and the force continues to act afterwards. The acceleration of the body is? Since us and uk are static as well as kinetic friction

1) 0.98. 2)3.92

Answer 1

The acceleration of the body is a =  1 m/s^2

Explanation:

The Uniting friction = μs R

μs mg = 0.5 × 60 × 10 = 300 N

Kinetic friction = μk R = μ k mg  = 0.4 x 60 x 10 = 240 N

Force applied = 300 N

Net accelerating force = Applied force - kinetic friction

ma = 300 - 240 = 60

a =  60  / 60  = 1 m/s^2

Thus the acceleration of the body is a =  1 m/s^2

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If the mass of a moving object is 50 kg, what force will be required to speed up the object at a rate of 2 ms^-2 ?

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Answer 2

Answer:

0.98m/s²

Explanation:

acceleration=(us-uk)g

=(0.5-0.4)9.8m/s

=0.1*9.8

=0.98m/s²