Question

If a force of 5N is applied parallel to moment arm 5m , then torque is:
a) 0N
b) 5N
c) 10N
d) 15N

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Answer 1

Answer:

Given that moment of force is 5 N-m about a point O when we apply a force of 10 N. We know that moment of force is given by formula rXF.

5=r×5

r=1m.

Hence we apply a force at a perpendicular distance of 1 m.

Answer 2

Concept:

Torque: Torque is defined as the product of the applied force and the perpendicular distance from the axis. Mathematically, it can be expressed as,

τ = F×r          

τ = Fr sin θ           ------------------------ (i)

where τ = Torque

F = Force

r = Perpendicular distance or moment arm

θ = Angle between force and perpendicular distance

Answer:

The correct answer is option a) 0 Nm

Solution:

Given that force applied, F = 5 N

Moment arm, r = 5 m

Force is parallel to the moment arm which means that the angle between the force and perpendicular distance is 0.

θ = 0°

Putting the values of F and r in (i), we get

τ = Fr sin θ

τ = (5)(5) sin 0°

τ = 25 × 0

τ = 0 Nm

Hence, the torque is 0 Nm.

So, the correct answer is option a).

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