Mechanics 1

displacement

distance travelled in a particular direction measured in meters (m)

terminal velocity

upwards force equals force of gravity, acceleration stops and object travels at a fixed velocity

acceleration due to gravity exp. graph

x=2d y=t(squared)

acceleration due to gravity formula

2s/t(squared)

Slope of acceleration due to gravity graph

value of g

Newton's First Law

a body continues in a state of rest or uniform motion in a straight line unless a resultant external force acts on it

Inertia

Object's refusal to change their state of motion

Momentum (p)

mass x velocity

Momentum unit

kgm/s (kilogram meter per second)

Newton's Second Law

F is proportional to mass x acceleration

Force Units

N or kgm/s^2

Mass

the mass of a body is a measure of it's inertia

Weight

mass x gravity

Newton's Third Law

To every action there is an equal and opposite reaction, action and reaction do not happen on the same body

Law of Conservation of Momentum

(m1 x u1) + (m2 x u2) = (m1 x v1) + (m2 x v2)

work

force x displacement

work units

Joules (J)

Energy

the ability to do work

Energy Units

Joules (J)

Energy Rule

Energy cannot be created or destroyed but may be changed from one form to another

kinetic energy

the energy an object has due to its motion

Ek

1/2 x M x V^2

Potential Energy

The energy an object has due to it's position, state or shape

Ep

Mass x Gravity x Height

Engery (E)

Mass (M) x C^2 (speed of light^2)

Power

The rate at which work is done

Power (P)

W (work done) / T (time taken)

Efficiency

when machines convert energy from one form to another usually there is a loss of some of the energy, the energy given out is usually less than the energy put in

Percentage Efficiency

Po (Power Output) x 100 / Pi (Power Input)