Moments are measured in

1.   ?    Newton second (Ns)
2.   ?    Second (s)
3.   ?    Newton metre (Nm)
4.   ?    Kilogram metre per second (kg m/s)

A moment is

1.   ?    the turning effect of a force.
2.   ?    the time interval in which a force is applied.
3.   ?    the product of mass and velocity.
4.   ?    the work done by a force

Moment =

1.   ?    force × distance moved
2.   ?    force × perpendicular distance from pivot
3.   ?    force ÷ perpendicular distance from pivot
4.   ?    perpendicular distance from pivot ÷ force

If a seesaw is balanced, this means that

1.   ?    the clockwise moment is greater than the anticlockwise moment.
2.   ?    both moments are equal, and in the same direction.
3.   ?    the clockwise moment is less than the anticlockwise moment.
4.   ?    the clockwise moment is the same as the anticlockwise moment.

A spanner 0.25 m long is used to turn a nut to a moment of 100 Nm. The force than needs to be applied is.

1.   ?    25 N
2.   ?    100 N
3.   ?    250 N
4.   ?    400 N

Which one of these statements is correct about centre of mass?

1.   ?    It only occurs when the object has gravity acting on it.
2.   ?    It does not exist in reality; it's only a theoretical concept.
3.   ?    It is a point in the object which is not subject to the laws of physics.
4.   ?    It is a point through which all the mass is thought to act.

The centre of mass in a regular object is found:

1.   ?    at the centre of the object
2.   ?    towards the bottom of the object
3.   ?    towards the top of the object
4.   ?    outside the object

An regular object is tilted so that it topples over. Which one of these statements is correct?

1.   ?    The line of action of the weight is within the base of the object.
2.   ?    The line of action of the weight remains at 90 degrees to the base.
3.   ?    The line of action of the weight passes outside the base of the object.
4.   ?    The line of action of the weight disappears.

A rectangular object is hung so that it hangs freely from one point, then a second point. Vertical lines are drawn from the suspension points. Which one of these statements is the correct one about the centre of mass?

1.   ?    The centre of mass is half-way between the two lines of action
2.   ?    The centre of mass is halfway between the two points from which the object is hung
3.   ?    The centre of mass is where the two lines meet.
4.   ?    The centre of mass is at the hanging points.

Which one of these would result in the most stable vehicle?

1.   ?    Low centre of mass and wide track.
2.   ?    High centre of mass and narrow track
3.   ?    Low centre of mass and narrow track
4.   ?    High centre of mass and wide track.