Physics AS Mechanics
- Created by: branerz_96
- Created on: 04-01-13 14:06
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- Physics AS Mechanics
- Motion
- Motion graphs
- average speed=distance/time
- Displacement in a specific direction
- Gradient of displacement/time graph
- Displacement in a specific direction
- Velocity/time graph
- Gradient= acceleration
- Area= displacement
- average speed=distance/time
- Vectors
- Represented by arrows
- Trig to work out resultant force
- If only have resultant force find compnents
- Represented by arrows
- Scalars
- Vector Quatitys
- Magnitude and direction
- Displacement
- Acceleration
- Force
- Velocity
- Momentum
- Magnitude and direction
- Scalar Quatitys
- Magnitude only
- Tempurature
- Density
- Distance
- Pressure
- Speed
- Magnitude only
- Vector Quatitys
- Motion graphs
- Work and Energy
- Efficiency
- efficiency=useful energy/total input energy
- x 100 to make it percentage efficiency
- Sankey diagrams
- shows out put of an appliance. Useful and not useful
- efficiency=useful energy/total input energy
- Conservation of energy
- Energy cannot be created or destroyed
- Only transformed
- Sankey diagrams
- shows out put of an appliance. Useful and not useful
- Energy cannot be created or destroyed
- Forms of energy
- Chemical,Electrical, Gravitational potential, Nuclear, Sound, Knetic
- Only transformed
- Gravitational potential energy
- The energy a body has by virtue of its position in a gravitational field
- Ep=mgh
- Knetic energy
- The energy a body has by virtue of its motion
- Ek=1/2 mv^2
- Chemical,Electrical, Gravitational potential, Nuclear, Sound, Knetic
- Power
- Watt(w)
- 1 watt is the power when i joule is done in 1 second
- 1W=1Js^-1
- 1 watt is the power when i joule is done in 1 second
- Power=work done/time taken
- Power= transferred / time
- Watt(w)
- 1 watt is the power when i joule is done in 1 second
- 1W=1Js^-1
- 1 watt is the power when i joule is done in 1 second
- Watt(w)
- W=fx in direction of the force
- Power= transferred / time
- Watt(w)
- Materials
- Elastic
- material stretches and follows hookes
- A material follows hookes law when the extention producedis proportional to the force providing it
- only when the elastic limit has not been exceeded
- When elastic limit has been reached object is permanently deformed
- only when the elastic limit has not been exceeded
- A material follows hookes law when the extention producedis proportional to the force providing it
- material stretches and follows hookes
- Young Moduls= stress/ strain
- Stress=force/ cross sectional area
- Strain= Extension/ Length
- Elastic
- Work Done
- W=fxcos0 is the force is at an angle to the direction of the force
- W=fx in direction of the force
- 1 Joule= 1 Newton metre, when a force of 1N moves an object over a distance of 1M
- W=fxcos0 is the force is at an angle to the direction of the force
- Efficiency
- Forces
- Resultant forces
- F=ma
- Resultant force= massx acceleration
- The newton= force that causes 1KG to accelerate at 1ms^-1
- Does not work for high speeds as mass increases
- Resultant force= massx acceleration
- Balanced forces
- Terminal velocity
- Drag= weight and acting forces
- Opposes motion
- Drag= weight and acting forces
- Terminal velocity
- Weight=mg
- F=ma
- Centre of gravity
- Where all the WEIGHT is considered to act as 1 force
- Find COG hang from 1 point, draw along plumb line, do with 2 more different points
- Turning forces
- Couple
- 2 equal and opposite forces acting the opposite direction producing rotation
- Torque describes the turning effect of the couple
- Torque= force x perpendicular distance
- Couple
- Pressure
- Pressure= force/ area
- 1Pa= 1N spread evenly over 1m^2
- Force per unit area
- 1Pa= 1N spread evenly over 1m^2
- Pressure= force/ area
- Density
- Mass per unit volume
- Kgm^-3
- Density= mass/ volume
- Makes things float or sink
- Mass per unit volume
- Car Safety
- Crumple zones increase time of deceleration
- seat belts and airs bags do the same
- Thinking distance= speedx thinking time
- Breaking distance UVAST
- Stopping distance= Breaking + Thinking
- Breaking distance UVAST
- Crumple zones increase time of deceleration
- Resultant forces
- Motion
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