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- 1. Multiple Choice1. A _________is a simple machine with a fulcrum and a rigid bar.PivotLeverWedge
- 2. Multiple Choice
What is the anticlockwise moment acting on this crane?80,000Nm100,000Nm120,000Nm140,000Nm - 3. Multiple ChoiceUnit of force.MeterCentimeterNewton
- 4. Multiple Choicethis cupboard is filled with boxes. will it topple over ?it willit will notit will if the weight remains inside the base
- 5. Multiple ChoiceWhat is the centre of mass ?it is a single point at which the object can balance.The mass is distributed equally around it.the centre of gravity of the objectAll of the above
- 6. Multiple Choice
The diagrams show four solid cones. The centre of mass of each cone is marked by a point labelled M.
Which cone is the most stable
A
B
C
D
- 7. Multiple Choice
A
B
C
D
- 8. Multiple Choice
The diagram shows a uniform, flat metal sheet hanging freely from a nail at point A. One of the labelled points is at the centre of mass of the metal sheet.
Which point is at the centre of mass?
A
B
C
D
- 9. Multiple Choice
Which one is the measure of how much matter an object has?
weight
gravity
mass
volume
- 10. Multiple Choice
Where the center of mass of a circle lies?
At its centre
Anywhere on its radius
Anywhere on its circumference
Anywhere on its diameter
- 11. Multiple Choice
A simple method to find centre of mass of a body is usage of
stop watch
plumbline
pendulum
gauge
- 12. Multiple Choice
What is the unit of moment of force?
N
m
Nm
N/m
- 13. Multiple ChoiceMoment is a quantity that tells turning effect of a force about turning point.TRUEFALSE
- 14. Multiple Choice
State the principle of moments.
When a system is in equilibrium, the sum of the total clockwise moment is equal to the sum of the total anti-clockwise moment about the same pivot.
When a system is in equilibrium, the sum of the total clockwise moment is greater the sum of the total anti-clockwise moment about the same pivot.
When a system is in equilibrium, the sum of the total clockwise moment is less than the sum of the total anti-clockwise moment about the same pivot.
When a system is in equilibrium, the sum of the total clockwise moment is equal to the sum of the total anti-clockwise moment about the different pivot.
- 15. Multiple Choice
The relationship between the numbers of teeth on two meshing gears used to transmit motion. It reflects the change in mechanical advantage resulting from the gears.
Gear pitch
Tooth decay
Gear ratio
aspect pitch
- 16. Multiple Choice
True or False: Two meshed gears always rotate in opposite directions
True
False
- 17. Multiple Choice
Ratio of moments = ratio of the number of teeth = ratio of radii
True
False
- 18. Multiple Choice
A larger wheel of radius 40cm has a moment of 160Nm and is being driven by a smaller wheel of 20cm radius. What is the moment about the smaller wheel?
20 Nm
40 Nm
80 Nm
10 Nm
- Answer choicesTagsAnswer choicesTags