Topic 1 Quiz

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.