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32 Cards in this Set
- Front
- Back
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Define a moment |
Turning effect of a force |
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Give 2 examples of Levers and a brief purpose for each linking to moments |
- Hammer: Can be used to remove a nail - Crowbar: Can be used to lift a plank |
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If the moment on the right side of an scale is 20Nm then the less has to also be 20Nm True or false |
True |
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Define what a lever can do to the force of object and how 4 marks |
Levers are force multiplers: - Levers allow us to lift a heavy object by applying a relatively small amount of force - This changes/decreases the perpendicular distance from the pivot the the force of action - This then alters/increases the force in order to maintain the moment as both sides have the same moment |
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The moment on the right side is 10Nm what is the moment on the left side |
10Nm |
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What has the lever done to the force on the left side and by how much |
Multipled the force by X5 |
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Name 2 things which can transmit the turning effect of a force |
-Levers -Gears |
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What do Gears and Levers transmit |
Turning effect of a force |
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Name one place we can find gears |
Cars |
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In gears state what the turning effect depends on |
- The distance between the edge of the gear and centre |
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Random Question:
2 gears are interlocking starting with A then to B
GEAR A: Is connected directly to the turning force of the engine
GEAR B: Is connected to the wheels
Describe what this gear system will do with the turning force and briefly what will happen to Gear B when the gear system is in use |
- This gear system will transmit the turning force from the engine to the wheels - Gear A will turn and it will apply a force onto Gear B
- This will make Gear B turn as long as Gear A turns
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What does it mean for the turning effect if Gear A has twice the radius of Gear B |
- The distance between the centre and the edge is double Gear A - This means that the turning effect is twice as large as Gear A for Gear B as it is transmitted |
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If Gear A has half the radius of Gear B and they are both interlocking is the work done the same or not: explain why |
The work done is the same - Gear A rotates twice every time Gear B rotates once - The turning effect is doubled for Gear B as the radius is twice of Gear A This shows that the work done will be balanced therfore the same |
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If there are 2 gears which why do each turn 2 marks |
- They each turn in opposite directions - so clockwise and anticlockwise |
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How do gears turn |
- Turning force applied to 1 wheel - Because they are interlocked the other gear will turn |
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How do the gears stay intelocked and not slip 1 mark |
The teeth prevent wheels from slipping |
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How many wheels need to have power for all gears to turn. 1 mark |
1 |
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The gear that has the power is called 2 things 1 mark |
The driver or effort gear |
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The larger the radius of the gear the larger the....... |
Moment |
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What is the radius in the gear |
The distance from the pivot |
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What happens to the moment when a small gear drives a big gear 1 mark |
The moment increases |
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What happens to the moment when a big gear drives a small gear1 mark |
The momrnt decreases |
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What is the radius in the gear |
The distance from the pivot |
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Which gear will move faster The larger gear The smaller gear |
Smaller gear |
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The force applied on all gears are different or the same |
The same |
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Which 2 things are force multipliers |
Gears and levers |
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Which gear is easier to turn The smaller or larger gear |
Smaller |
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A driver gear has 20 teeth and the driven gear has 80 teeth. When the driver gear turns once how much has the driven gear turned 2 marks |
1/4 turned because its 4 times bigger than driver |
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What is the names of the gears that are turned 2 marks |
Driven or load |
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3 things that a force can do to a object |
- Shape - Direction - Speed |
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If going uphill which gear would be the driver and why. 2 marks |
- It takes less turning force to turn the gear
- which makes it easier when going uphill againest gravity |
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If traveling normally on a bike which gear would be the driver and why. 2 marks |
- Driver gear would be larger - More turning force needed - makes bike go faster |
