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Turning
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1994-08-31
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@If a person wanted to loosen this nut, where would be the best place and distance to apply a force?
#tur1
At x
At w
At z
@The same force is applied to w and y. The turning force at y is:
#tur1
Smaller than at w
Bigger than the turning force at w
The same size as the turning force at w
@Turning forces depend on:
The force & distance from the pivot
Forces only
Distances only
@The units of a turning force are:
Nm
Nm²
Pa
@Which one of the following ideas would not help to make an object more stable?
Putting extra mass on top of it
Making the base wider
Making the centre of gravity lower
@The turning effect of a force is called:
A moment
Equilibrium
Pivot
@When forces balance exactly this is called:
Equilibrium
Reaction
Inertia
@For equilibrium to occur in turning forces, which one of the following must be true?
The clockwise moment equals the anticlockwise moment
The clockwise moment is just larger than
The clockwise moment must be zero
@A racing car is stable because:
It has a low centre of gravity
It is very light
It is shaped to go through the air easily
@Twice as much force is applied at point z then at point w. No force is applied at points x or y. What happens?
#tur1
Nothing
The nut turns clockwise
The nut will move anticlockwise
@A turning force depends on two things. These are:
Force and distance from fulcrum
Mass and weight
Gravity and friction
@If the centre of gravity of an object is raised, then the object will:
tend to topple over
become more stable
remain exactly as it was before
@A wine glass is less stabe when it is full because:
the centre of gravity (mass) has been raised
the liquid occupies a large surface area
the mass os the glass has increased
@If you only had one mass to place on the right hand side, where would you put it to balance?
#turn2
Position Z
Position W
Position Y
@If you placed a single mass at position Y then:
#turn2
The balance would turn anticlockwise
Nothing would happen as it would be perfectly balanced
Clockwise movement would occur