Physics

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What is direct proportion?
Straight line through the origin
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State Hooke's Law
The extension of a spring is directly proportional to the load on it
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What happens after a wire reaches its elastic limit?
Extends plastically, permanently deformed, stretches more than expected
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In 'F=Kx' what does the 'K' stand for? What is it measured in?
Spring Constant in N/cm
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Name the ten types of force
Weight, electrostatic, tension, compression, thrust, lift, upthrust, magnetic, friction, normal reaction
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What does normal reaction do?
'pushes back' from a solid surface
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How much is gravity on earth?
10 N/kg
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How do we find weight?
mass x gravity
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Where is an objects centre of gravity?
The point at which the weight seems to act
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What does the moment depend on?
The size of the force and the distance from the force to the pivot
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What is 'moment'? What is it measured in?
The turning effect of the force in Nm
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Complete: Moment= _ _
Force x distance between the force and the pivot
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Name the nine energy names
Kinetic, heat, light, gravitational, chemical, sound, electrical, elastic, nuclear
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State the first law of energy
It cannot be created or destroyed, only changed from one type to another.
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State the second law of energy
Every time energy is changed, some is lost.
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What is G.P.E measured in?
Joules
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How much G.P.E does a 70kg diver gain when he climbs to a 5m board?
G.P.E=mgh..... =70x10x5...... =3500J
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What does G.P.E stand for?
Gravitational Potential Energy
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What is the equation for Kinetic Energy?
K.E.=1/2m x v(squared)
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What is the KE of a 0.4kg cricket ball moving at 40m/s?
=1/2x0.4x1600...... =0.2x1600..... =320J
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What is the work done to an object?
The amount of energy transferred to it
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W.D=FD means?
Work done(J)=Force(N)xDistance moved(m)
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Power is a measure of the amount of work done each _______
Second
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What is the equation for power?
P=E/T
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Efficiency= ?
Useful Output/ Total Input
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What way can heat move around only in liquids and gases?
Convection
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What type of heat transfer occurs only in solids?
Conduction
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Other cards in this set

Card 2

Front

State Hooke's Law

Back

The extension of a spring is directly proportional to the load on it

Card 3

Front

What happens after a wire reaches its elastic limit?

Back

Preview of the front of card 3

Card 4

Front

In 'F=Kx' what does the 'K' stand for? What is it measured in?

Back

Preview of the front of card 4

Card 5

Front

Name the ten types of force

Back

Preview of the front of card 5
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