Torque

In the figure, A is the ______ of the wheel.

• line of action

• pivot point

• torque

• axis

The figure shows a force acting on the wheel. The dashed line is ______

• the line of action

• the line of torque

• the axis of rotation

• the axis of translation

A, B, and C are three forces having the same magnitude. Which force creates the largest torque on the wheel?

• A

• B

• C

• They are equal

When the line of action of a force passes through the pivot point, the torque of the force is maximum.

• True

• False

The perpendicular distance between the pivot point and the line of action of the force is called the _____

Torque is a vector quantity.

• True

• False

The SI unit of torque is _____

The formula for calculating the magnitude of the torque is

•  $\tau=F.r.\sin\theta$  

•  $\tau=F.r.\cosθ$  

•  $\tau=F.r$  

•  $\tau=\frac{F.r}{\sin\theta}$  

A student uses a 42.0 cm long adjustable spanner to loosen a nut on her bike. She applies a force of 65.0 N at an angle of 68.0° to the spanner. What is the force arm?

• 42 cm

• 38.9 cm

• 45.3 cm

• 21 cm.

A student uses a 42.0 cm long adjustable spanner to loosen a nut on her bike. She applies a force of 65.0 N at an angle of 68.0° to the spanner. What is the torque applying to the nut?

• 25.3 N.m anti-clockwise

• 27. 3 N.m anti-clockwise

• 45.3 N.m anti-clockwise

• 68 N.m anti-clockwise