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9L: Pressure and Moments
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Pressure =
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force/area
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force x area
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area x force
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area/force
Which of the following is not a unit of pressure?
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N
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N/cm2
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Pa
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N/m2
Which of the following shoes would exert the least pressure?
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Snow shoes
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Trainers
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High heels
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Wellington boots
A man weighs 600N and the area of both his shoes is 150 cm2. What is the pressure on the ground?
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4 N/cm2
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750 N/cm2
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3 N/cm2
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0.4 N/cm2
We can use the pressure of liquids to work machines. This is called
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hydraulics
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pneumatics
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mechanics
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molecules
A lever which turns a small movement near the centre to a large movement at the outside is called
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distance magnifier
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force magnifier
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movement maker
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distance increaser
A lever which makes a small force able to lift a large load is called a
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force magnifier
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load magnifier
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distance magnifier
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load lifter
A system of ……………can be used to make lifting loads easier
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pulleys
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stairs
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loads
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levers
The turning effect of a force is called a
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moment
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spin
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load
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rotation
Moment =
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force x distance
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force/distance
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distance/force
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force x rotation
A person is trying to undo the nut on a lorry wheel. Which length of spanner will make life easiest?
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400cm
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40cm
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4cm
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12cm
If we apply a load of 20N to a 30cm spanner what will the turning force be?
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6 Nm
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1.5 Nm
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600 Nm
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15 Nm
In equilibrium
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the anticlockwise moment = the clockwise moment
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the anticlockwise moment > than the clockwise moment
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the anticlockwise moment < than the clockwise moment
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there is only a clockwise moment
A long spanner is
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easier to use than a short spanner
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harder to use than a short spanner
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just the same as using a short spanner
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only harder to use if the nut is wet
Weight is a force, it is caused by
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the pull of gravity
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the size of an object
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the resistance of the air
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how streamlined an object is
Which of the following will create the least pressure
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camels foot
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point of a drawing pin
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edge of a knife
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pastry cutter
Which of the following is a unit of area?
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square metres
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cm cubed
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ml
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mph
Air pressure is caused by
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the collisions of millions of tiny molecules with the surface of an object
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the air trying to push the surface down
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the molecules of air trying to attract each other
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the molecules of air reacting with the surface of an object
Levers and pulleys are both simple
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machines
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ideas
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forces
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types of energy transfers
When trying to close a door it will be easier if you
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push on the edge furthest away from the hinges
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push on the edge closest to the hinges
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push in the middle of the door
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push along the bottom of the door in the middle
Energy that is transferred into a from that is not useful is called
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wasted energy
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heat energy
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light energy
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destroyed energy
If an object is stable then it will have
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a low centre of gravity
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a large mass
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a small base
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a large span
We can balance a crane lifting a load using a
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counter-weight
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counter top
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back weight
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a top pan balance
When we pump up a bicycle tyre the friction caused by the air molecules rubbing against the tyre valve causes
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heat to build up
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limescale to build up
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the tyre to wobble
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the wheel to bend
We can use the pressure of gases to work machines. This is called
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pneumatics
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hydraulics
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mechanics
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molecules
Which of these is a unit of volume
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cm3
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m2
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mph
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J
Which of the following wheel barrows will be the best on soft ground?
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Large, wide tyre pumped up but not too hard
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Very hard tyre with a small area
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Small solid rubber wheel
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Large, narrow soid rubber wheel
A large force pressing on a small area gives
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a high pressure
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a low pressure
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a greater resistance
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a small resistance
Energy cannot be created nor destroyed, it can only be ……………………from one form into another
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transferred
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transported
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transposed
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transcended
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