Understanding Moments in Physics

How is the moment calculated?

• M=rxF

• M=Fd

• M=Fxr

• M=F*r

Definition of a moment

• a force that perpendicular to the line of action

• tendency of a body to rotate due to applied forced

• tendency to oppose motion

• a type of movement that requires no force

When calculating a moment, where is the r vector measured from?

• from the line of action to the point of rotation

• form the axis of rotation to the point at which the force is applied

• from the moment center to anywhere on the line of action of the force.

• from point A to point B

What is the unit of torque in the International System of Units (SI)?

• Newton (N)

• Joule (J)

• Newton-meter (Nm)

• Watt (W)

Which of the following tools uses the principle of moments?

• A hinged door opening

• A thermometer measuring body temperature

• A stopwatch timing a race

• A ruler measuring length

In the context of moments, what does it mean for a system to be in equilibrium?

• The system is moving at a constant velocity.

• The net force and net moment acting on the system are zero.

• The system is accelerating.

• The system is at rest.

If a beam is in equilibrium, what can be said about the sum of the clockwise and counterclockwise moments?

• The sum of clockwise moments is greater.

• The sum of counterclockwise moments is greater.

• The sum of clockwise and counterclockwise moments are equal.

• The moments do not affect equilibrium.

When in a moment negative?

• Counterclockwise (CCW)

• to the left

• Clockwise (CW)

• to the right

Which of the following is NOT a factor that affects the magnitude of a moment?

• The magnitude of the force applied

• The distance from the pivot point

• The angle at which the force is applied

• The weight of the object

What is the effect of increasing the distance from the pivot point on the moment of a force?

• It decreases the moment.

• It has no effect on the moment.

• It increases the moment.

• It reverses the direction of the moment.