# Physics 2

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- Created by: Katewood31
- Created on: 13-09-15 14:33

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- Motion,Energy,Electricty
- Velocity and Distance-Time Gaphs
- Speed and velocity are both measured in m/s
- speed is just how fast you are going with no direction. But velocity must have direction specified (30mph north)
- Its how fast you are going
- speed= distance/tim-e
- Acceleration
- is how quickly the velocity is chaning
- something speeds up
- this change in velocity can be changed in speed or a change in direction or both
- formula= change in velocity/time taken
- Example: A cat accelerates from 2 m/s to 6m/s in 5.6 seconds. Find its acceleration? A= 6-2=4/5.6=0.71M/S2
- units of acceleration is m/s2 (little two)

- Distance-time graphs
- Important Notes
- Gradient=speed
- flat sections are where its stationary (stopped)

- straight uphill or downhill section means steady speed
- the steeper the graph the faster its going
- downhill section means its going back towards the starting point
- curves represent acceleration or deceleration
- a steepening curve means its speeding up
- A levelling off curve means its slowing down

- Gradient=speed

- Important Notes

- Speed and velocity are both measured in m/s
- Physics 2
- Acceleration and velocity-time graphs
- Velocity-time graphs
- Important notes
- Gradient=acceleration
- flat sections represent steady speed
- steeper the graph the greater the acceleration or deceleration
- uphill section are acceleration
- downhill sections are decelerations
- the area under any section of the graph is equal to the distance travelled in the time interval
- a curve means changing acceleration

- Important notes

- Velocity-time graphs
- Weight,Mass and Gravity
- Gravational force is the force of attraction between all masses
- on the surface of a plant it makes all things accelerate towards the ground (10m/s2)
- it gives everything a weight

- Weight and mass aren't the same thing
- Mass is the just the amount of "stuff" in a object
- weight is caused by gravitational force( pull force)
- an object has the same mass whether its on earth or the moon, but weight will be different (less gravitational force on moon)
- Weight is a force measured in newtons. Mass is not a force-its measured in KG.

- Weight=mass X gravitational field strengh
- Example: what is the weight in newtons of a 5g mass, both on earth and moon? A"W=MXG" E=5x10=50N M=5X1.6=8N
- Gravity on earth=10n/kg Gravity on moon=1.6n/kg

- Gravational force is the force of attraction between all masses

- Velocity and Distance-Time Gaphs

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