4 years ago

Which forces always push in the opposite direction of motion slow stuff down.

2 answers:

8 0

Friction- the external force that acts on objects and causes them to slow down when no other external force acts upon them.

ella [17]4 years ago

8 0

The force that always pushes in the opposite direction of morion is friction.

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If you have to apply 40n of force on a crowbar to lift a rock that weights 400n, what is the actual mechanical advantage of the

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The mechanical advantage is defined as the ratio between the force produced by a machine and the force applied in input:
$MA= \frac{F_{out}}{F_{in}}$
For the crowbar of the problem, the force applied in input is 40 N, while the force produced in output is equal to the weight of the rock that is lifted, so 400 N. Therefore, the mechanical advantage is
$MA= \frac{400 N}{40 N}=10$

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