Moments

moment of a force =

• force x distance between forces

• mass x acceleration

• force x perpendicular distance from pivot

• mass x perpendicular distance to pivot

The principle of moments states that for a body to be in rotational _________, the sum of the clockwise moments about any point must be equal to the sum of the anticlockwise moments about that same point.

The weight of an object is said to act from the _________

• centre of mass

• centre of gravity

• top

• bottom

Select the correct definition for the principle of moments

• Sum clockwise = sum anticlockwise

• For a system in equilibrium the sum of clockwise moments = the sum of anticlockwise moments.

• Moment = force x distance in the direction of the force.

What is a moment?

• A force

• The turning effect of a force

• A pair of forces

• A force caused by a pivot

What distance must be used when calculating a moment?

• The distance between the force and the pivot

• The perpendicular distance between the line of action of the force and the axis of rotation

• The perpendicular distance between the the force and the centre of mass

• The perpendicular distance between the two forces

What is the unit of a moment?

What is an object's centre of gravity?

• The single point through which the object's entire weight can be said to act

• The single point at the centre of the object

• The closest point to the ground

• mass x gravitational field strength

Calculate the tension in the cable.

• 40

• 40.5

• 45

• 35

Tags

NGSS.HS-PS2-1

What is the moment acting on the seesaw?

• 1.6Nm
• 15Nm
• 16N
• 4Nm