Question

If static friction between wood and concrete is 0.62, determine force required to make a wooden block of mass 4 kg start to slide

Answer 1

Given:

Static friction between wood and concrete is 0.62.

To find:

Force needed to make a wooden block of mass 4 kg start to slide?

Calculation:

Now, the minimum applied force has to be equal to the max static friction (i.e. limiting friction) for the slide to move.

$\sf \: F_{min} = f_{limiting}$

$\sf \implies\: F_{min} = \mu( N)$

$\sf \implies\: F_{min} = 0.62(mg)$

$\sf \implies\: F_{min} = 0.62(4 \times 10)$

$\sf \implies\: F_{min} = 0.62 \times 40$

$\sf \implies\: F_{min} = 24.8 \: N$

So, minimum force required is 24.8 N.

Answer 2

Given:

Static friction between wood and concrete is 0.62.

To Find:-

Force needed to make a wooden block of mass 4 kg start to slide?

Calculation:-

Now, the minimum applied force has to be equal to the max static friction (i.e. limiting friction) for the slide to move.

F-min=F-limiting

⇒F-min=μ(N)

⇒F-min=0.62(mg)

⇒F-min=0.62(4×10)

⇒F-min=0.62×40

⇒F-min=24.8N

So, minimum force required is 24.8 N.

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