# Mechanics

- Created by: Alex
- Created on: 23-02-14 09:57

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- Mechanics
- Constant Acceleration Equations
- SUVAT
- v = u + at
- s = ut + 1/2 at^2
- s = 1/2 (u + v)t
- v^2 = u^2 + 2as
- s = vt - 1/2 at^2

- Acceleration due to gravity is when a = g
- g = 9.8 m/s^2
- up? a = g down a = -g

- SUVAT
- Motion Graphs
- Displacement Time
- Gradient = velocity
- the maximum displacement is the highest point on the graph.

- Velocity Time
- Area = Distance
- Gradient = Acceleration

- Displacement Time
- Displacement, Velocity and Acceleration
- displacement --> velocity --> acceleration differentiate!
- Acceleration --> velocity --> displacement integrate!

- Vectors
- vectors have magnitude and direction, scalars only have size.
- scalars
- speed, distance

- velocity, displacement, accceleration and force.
- the length of the arrow shows the magnitude of the vectore

- Forces and Modelling
- weight = mg
- Reaction is 90 degrees to the surface
- Friction opposes motion
- Tension opposes weight
- The 'model' is the forces diagram

- Forces and Vectors
- forces have components
- Horisontal = Fcos*
- Vertical = Fsin*

- R^2 = a^2 + b^2

- forces have components
- Friction
- F is less than or equal to the fristion force.
- Limiting friction is when F = mew R

- Newtons Laws
- A body will stay at rest unless a resultant force acts on it.
- The overall resultant force is equal to mass x acceleration
- For each force has an equal and oposite reaction force

- Friction and inclined planees
- Use F = ma in 2 directions in inclined plane questions.
- Resolve forces parallel and perpendicular

- Connected Particles
- Think friction!

- Momentum
- Momentum = mass x velocity
- Ft = mv - mu
- momentum before = momentum after
- Masses joined together have the same velocity

- Constant Acceleration Equations

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