Question

When does a machine act as (a) a force multiplier,
(b) a speed multiplier. Can a machine act as a force
multiplier and a speed multiplier simultaneously ?
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Answer 1

# WHEN LOAD ARM IS GREATER THAN EFFORT ARM
IT ACT AS A FORCE MULTIPLIER

#A machine acts a speed multiplier when the effort arm is shorter than the load arm. The mechanical advantage of such machines is less than 1.

# It is not possible for a machine to act as a force multiplier and speed multiplier simultaneously. This is because machines which are force multipliers cannot gain in speed and vice versa.

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Answer 2

Answer:

Mechanical advantage (MA) = Effort arm / Load arm

a) A force multiplier

• Multiply force by a constant factor.
• But divide the distance by the same factor.
• When Effort arm > Load arm, MA > 1 and such machine acts as a force multiplier.

b) A speed multiplier

• Multiply speed by a constant factor.
• Also acts as a force divider.
• When Effort arm < Load arm, MA < 1 and such machine acts as a speed multiplier.

No, a machine cannot act as a force multiplier as well as a speed multiplier at the same time.

We can either overcome a large resistive force or can obtain gain in speed.