M2.2 Moments

An object will not accelerate unless a resultant force acts on it. Which of Newton's Laws is this?

• 1st

• 2nd

• 3rd

• Gravitation

What are the units of moments?

• J/s

• Nm

• W/m

• N/m

What is meant by the moment of a force?

• the instant a force acts

• the effect that a force has

• the turning effect of a force about a pivot

• the acceleration of a force about a pivot

What happens to the moment of a force if the distance to the pivot is doubled?

• The moment is halved

• The moment remains the same

• The moment is doubled

• The moment is quadrupled

Which of the following conditions is necessary for an object to be in static equilibrium?

• The object must be accelerating

• There must be no forces acting on the object

• The net force and net moment must both be zero

• The object must be moving at a constant speed

Which condition must be met for an object to be in rotational equilibrium?

• There must be no forces acting

• The object must be stationary

• The net moment must be zero

• The net force must be zero

• A

• B

• C

• D

What happens to an object if the net force acting on it is zero?

• It must be accelerating

• It could be either stationary or moving at a constant speed

• It must be stationary

• It must be moving at a constant speed

What is the correct formula for the moment of a force?

• Moment = force x distance

• moment = force x distance to pivot

• moment = force x perpendicular distance to pivot

• moment = force / distance

What does it mean if an object is in equilibrium?

• There is no movment

• The object is stationary

• The resultant force on the object is zero

• There are no forces acting on the object