If a body is at rest and the forces acting on it are balanced then the body will remain at rest, However if the body is moving and the forces acting on it are unbalanced then the body will keep moving at a constant speed in a straight line.
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what is newtons 2nd law?
F=M x A
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what is newtons 3rd law?
For every action there is an equal and opposite reaction.
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what is a scalar?
Just a number
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What is a vector?
A number and a direction
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Weight=
Weight=M x G
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Work=
work=FxD
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What is the equation in Hooks law?
Force=K x E (Force= spring constant X extension)
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Kinetic energy=
Kinetic energy= 0.5 x M x V(squared)
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Pressure=
Pressure=H x P x g (pressure= height X density X gravity)
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Acceleration=
a= change in velocity/time
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resultant Force=
F=M x A
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2 Things that effect thinking distance
Drinking, Drugs, Tiredness
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2 things that effect breaking distance
Condition of tyres, weight of car, condition of the road
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Momentum (P)=
P=m X v
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Time period(T) =
T= 1/F
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what do we use to measure the frequency of a wave
a ripple tank
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wave speed (V) =
V= Frequency X wavelength
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2 things that change the strength of an electromagnet
Change the current, change the coil around the iron core
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2 characteristics of a good absorber
Dark surfaces and matte surfaces
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2 characteristics of a good emitter
Dark surfaces and matte surfaces
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a characteristic of a good reflector
shiny surface
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when does DIFFRACTION happen
when a wave passes through a gap
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When does REFRACTION happen
when a medium passes through another medium
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what are the waves in the electromagnetic spectrum?
Radio waves, Microwaves, infrared waves, visible light, ultraviolet, x rays, gamma rays
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P waves are....
Primary waves, longitudinal waves, solids and liquids
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