# Physics Paper 2 - Forces - AQA

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- Created on: 27-05-18 12:51

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- Forces - Paper 2 GCSE Physics (AQA)
- Contact and Non-Contact Forces
- Vectors have Magnitude and Direction
- A Vector is something like: Force, Velocity, Displacement, acceleration, momentum etc...

- Scalar have Magnitude but no Direction
- Contact and Non-Contact Forces are pretty self explanatory
- Something physical such as Friction, Air resistance, tension etc are all Contact
- Something non-physical or not touching such as magnetism, gravity, electrostatic forces. Are all Non-Contact

- Vectors have Magnitude and Direction
- Weight, Mass and Gravity
- Gravity attracts all masses. This gives everything a weight.Untitled
- Weight =
- Mass x
- Gravitational Field Strength

- Mass x
- Weight is measured in Newtons
- Mass is measured in Kilograms
- GFS is measured in N/Kg

- Weight =
- Mass is the amount of 'stuff' something has

- Gravity attracts all masses. This gives everything a weight.Untitled
- Resultant Force and Work Done.
- Free Body Diagrams show all the forces acting on an object
- For example, a skydiver will have his weight pulling him down and air resistance acting in the opposite direction

- A resultant force is the Overall Force on a Point or Object
- When a force moves an object through a distance, ENERGY IS TRANSFERRED and WORK IS DONE

- Free Body Diagrams show all the forces acting on an object
- Elasticity and Springs
- F=KE
- Force(N) = constant(N/m) x extension (m)

- 1/2 KE^2
- 0.5 x Constant x Extension (SQUARED)

- An object is inelastically de-formed if it does not return to its original shape

- F=KE
- Moments and Newton's Laws
- M = FD
- Moment (Nm) = Force (N) x Distance(m)

- Levers make it easier for us to do work
- Levers increase the distance from the pivot at which the force is applied
- Gears however transmit rotational Effects
- The gears have teeth which interlock and turn eachother
- Gears however transmit rotational Effects

- Newton's Laws (MEMORISE)
- NEWTON'S FIRST LAW
- If the force on an object is zero than the object will remain at the same velocity

- NEWTON'S SECOND LAW
- F = ma
- Force(N) = Mass(Kg) x acceleration(m/s^2)

- F = ma
- NEWTON'S THIRD LAW
- Every action has an equal and opposite reaction

- NEWTON'S FIRST LAW

- M = FD
- Pressure and Density
- P = F/A
- Pressure(Pascal's) = Force(N) / Area(m^2)

- D = M/V
- Density is the 'compactness' of a substance

- P = F/A
- Distance, Speed and Velocity
- a= change in v/t
- Acceleration = Change in Velocity / Time

- v^2 - u^2 = 2as
- You can show a vehicles journey on a distance-time graph where positive gradient is acceleration
- Terminal Velocity is the maximum velocity an object can face when falling from a certain height
- It occurs when an objects weight and air resistance are equal

- P=mv
- Momentum = mass x velocity
- F= m(change)v / (CHANGE) t

- a= change in v/t

- Contact and Non-Contact Forces

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