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OCR GCSE physics > P2.3 > Flashcards

P2.3 Flashcards

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1
Q

What are plastic materials

A

Materials that stretch but don’t return to their original shape they are deformed when you apply forces and stay that way when u remove them.

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2
Q

What are elastic materials

A

Return to their original shape when you remove the forces

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3
Q

What is an elastic material shown as on a graph

A

A straight line

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4
Q

What is the limit of proportionality

A

The point where the graph of force against extension is no longer straight and then curved.

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5
Q

What is the elastic limit

A

The point where it stops behaving elastic and after this point won’t return to it’s original shape.

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6
Q

Equation for force exerted by a spring

A

Force exerted by a spring = spring constant x extension

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7
Q

What is the gradient of the force extension graph

A

The spring constant

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8
Q

When is force and extension proportional

A

Up to the limit of proportionality

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9
Q

Formula for extension

A

extension = final length - original length

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10
Q

equation for energy transferred by the spring

A

energy transferred in stretching = 1/2 x spring constant x extension squared

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11
Q

What is a gravitational field

A

A region where a mass experiences an attractive force

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12
Q

Formula for gravity force

A

gravity force = mass x gravitational field strength

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13
Q

What is gravitational field strength

A

A measure of the force on 1kg of mass when it is in the gravitational field of another mass

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14
Q

Weight formula

A

Weight = mass x gravitational field strength

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15
Q

what is the acceleration due to gravity

A

10 m/s squared

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16
Q

Formula for gravitational potential energy

A

gravitational potential energy = mass x height x gravitational field strength

17
Q

What is a moment

A

A turning effect

18
Q

What does a moment depend upon

A

It depends on the size of the force and the distance from the pivot where the force acts, where the direction of the force and the distance measures are at 90 degrees to eachother

19
Q

Moment formula

A

Moment = force x distance

20
Q

When is an object balanced

A

An object is balanced when the anticlockwise moments = the clockwise moments

21
Q

What is a lever

A

A lever is a force multiplier as it transmits force by rotating around a pivot

22
Q

What is the effort

A

the force exerted on the lever

23
Q

What is the load

A

the force the lever exerts on the load

24
Q

mechanical advantage formula

A

mechanical advantage = load/effort

25
Q

Formula for force output

A

effort x distance from pivot to effort = load x distance from load to pivot

26
Q

What does the ratios of cogs tell you

A

The ratio of diameters of the cogs gives you the force multiplication of it

27
Q

What is essential for hydraulics

A

Pressure is conserved in liquids

28
Q

When a larger cog feeds into a smaller cog what happens

A

speed multiplication

OCR GCSE physics (21 decks)

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