| What are the units of density? | Kilograms per metres cubed (kg/ m3 |
| What is Density? | Density is the amount of mass in a volume (mass/volume) |
| Which state of matter is usually the densest? | Solid |
| What is the name of the equipment you would use to measure the volume of a solid by using water? | A displacement can |
| Describe mass? | Mass is the measurement of the amount of matter, measured in Kg |
| Describe Weight? | Weight is a Force caused by a Mass in a Gravitational Field |
| State how to calculate weight? | Weight (N) = Mass (Kg) x Gravitational Field Strength (N/Kg) |
| Why must there be a resultant force acting an object moving in a circle? | 1) The object is constantly changing direction so its velocity is changing
2) Velocity is changing so its accelerating
3) Acceleration can only be caused by a resultant force |
| What is the name of the force acting on an object moving in a circle? | Centripetal Force |
| Describe the velocity of an object moving in a circle? | The object is constantly changing direction so its velocity is changing |
| State Newton's second law in terms of momentum? | Force(N) = Change of momentum (Kg m/s) / time taken (s) |
| What is Newton's third law? | When two objects interact, the forces they exert on each other are equal and opposite |
| What is equilibrium? | The forces are balances so the resultant force is zero |
| When two bodies interact, what can you say about the size and direction of the action and reaction force? | Equal and Oppersite |
| State the conservation of momentum? | The momentum before the collision will be the same as the momentum after the collision |
| State calculation to find momentum? | Momentum (Kg m/s) = Mass (Kg) x Velocity (m/s) |
| State three factors that will increase the thinking distance of a car? | High speed, tiredness, alcohol, drugs |
| State three factors that will increase the braking distance of a car? | High speed, worn brakes, worn tyres, poor conditions (ice/ water) of road |
| What two factors make up the overall stopping distance of a car? | Thinking distance + Braking distance |
| Explain how air bags, a crumple zone, seatbelts reduce injury: | Increase the time taken for the object to stop reducing the rate of change of momentum so, reducing force |
