# physics

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- Created by: Finlay Poultney
- Created on: 07-12-15 18:40

resolution

the smallest measurement on the utencil

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uncertainty

percentage uncertainty = absolute uncertainty/ (mean) value x100

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displacement

the distance travelled in a particular direction

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acceleration

rate of change in velocity

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equation of motion without s

v=u+at

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equation of motion without v

s=ut+1/2at^2

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equation of motion without a

s=1/2(u+v)t

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equation of motion without t

v^2=u^2+2as

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density

mass per unit volume (kgm^-3)

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pressure

the force exerted per unit cross-sectional area (pascals)

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scalar quantity

has a magnitude only

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vector quantity

has a magnitude and direction

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average speed

distance/ time

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terminal velocity

the velocity at which the weight = drag

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work done

force X distance moved in the direction of force

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joule

the energy transferred when a force of 1 newton moves a distance of 1 metre in the direction of force

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kinetic energy

KE= 1/2mv^2

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gravity

9.81 ms^-2

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stopping distance

thinking distance + braking distance

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thinking distance

the distance travelled between the moment when you first see a reason to stop to the moment when you first apply the breaks

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braking distance

the distance from when the vehicles brakes is applied to when it fully comes to a halt

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centre of gravity

the point where the entire weight of an object appears to act

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moment

moment = force x perpendicular distance of the line of action of the force from the axes or point of rotation

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conditions for equilibrium

the net force on it must be zero and the net moment must be zero

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principle of moment

for a body in rotational equilibrium, the sum of the anticlockwise moments about any point is equal to the sum of the clockwise moments about the same point

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momentum

mass x velocity

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principle of conservation of momentum

for a closed system, in any specific direction, the total momentum before an interaction (collision) is equal to the total momentum after the interaction

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closed system

no external forces acting

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elastic collision

momentum and kinetic energy are conserved

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inelastic collision

momentum is conserved but kinetic energy is lost

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couple

a pair of equal, parallel but opposite forces which tend to produce rotation only

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torque of a couple

one of the forces x perpendicular separation of those forces

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conditions for a pair of forces to form a couple

equal in magnitude, parallel but opposite in direction, separated by a distance

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newtons 1st law

an object will remain at rest or keep travelling at a constant velocity unless it is acted upon by external forces

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newtons 2nd law

the net force acting on an object is directly proportional to the rate of change of the linear momentum of that object. The net force and the change in momentum are the same direction.

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newtons 3rd law

when two bodies interact, the forces they exert on each other are equal and opposite

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stretching forces

tensile forces

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squashing forces

compressive forces

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Hookes law

the extension of a spring is directly proportional to the force applied, as long as the elastic limits is not exceeded

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force constant of a spiring

the stiffness, obtained by the gradient

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elastic potential energy

the energy stored in an object because of its deformation

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tensile stress

the force applied per unit cross-sectional area of the wire (pascals)

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tensile strain

the fractional change in the original length of the wire (%)

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## Other cards in this set

### Card 2

#### Front

percentage uncertainty = absolute uncertainty/ (mean) value x100

#### Back

uncertainty

### Card 3

#### Front

the distance travelled in a particular direction

#### Back

### Card 4

#### Front

rate of change in velocity

#### Back

### Card 5

#### Front

v=u+at

#### Back

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