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Y7 Revision F
Revisions of Forces
| Question | Answer |
|---|---|
| What 2 things can a force be? | Push or Pull |
| Can you see forces? | No |
| What instrument do you use to measure forces? | Force Meter |
| What is the symbol and unit of a force? | Newtons N |
| How much is 1kg in newtons? | 10N |
| Does mass or weight change when you go to the moon? | Weight |
| What is Mass measured in? | Kg |
| What is weight measured in? | N |
| Mass | The amount of stuff or matter the thing contains.This never changes |
| Weight | The gravitational force between the object and Earth |
| Gravity | All objects have a force that attracts them towards each other |
| What 2 times does gravitational force increase? | 1)The masses are bigger2)The objects are closer |
| What 2 things do you need to know to work out pressure? | 1)Force or weight applied2)The area other which the force or weight is applied |
| What is the equation for pressure? | Pressure=Force/area/means divided |
| Give 2 examples of pressure | 1)Chair legs2)Drawing pins |
| How do we show forces in a force diagram? | 1)Longer or thicker arrow shows how big the force is2)The direction in which the arrow is pointing |
| What is a balanced force? | When 2 forces of equal size are working on an object |
| What happens with a balanced force on a stationary object? | It stays where it is |
| What happens with a balanced force on a moving object? | It stays the same speed |
| What is an unbalanced force? | When 2 forces working on a n object are not of equal size |
| What happens with an unbalanced force on a stationary object? | It starts to move |
| What happens to an unbalanced force on a moving object? | It changes direction or speed |
| How do you work ot the resultant force? | The biger force minus the smaller forcee.g.100N-20N=80N |
| What is friction? | When 1 object moves by another object.Friction makes it harder to move |
| Give 3 useful friction forces? | 1)Friction between our shoes and the floor stop us slipping2)Friction between tyres and roads to stop us from skidding3)Friction between brakes and wheels to slow down the cars and bikes |
| What is air resistance? | Air resistance is like friction but in the air.It slows you down |
| What do you need to know to work out a moment? | 1)Distance from pivot2)Force |
| What is the equation of a moment? | Moment=Distance*Force* means multiply |
| Pivot | Like in the middle of a see saw.The middle of a turn. |
| What is a moment measured in? | Nm Newton metre( Dont get confused by Newton meter) |
| Give 4 examples of moments | 1)Spanner2)See Saw3)Scissors4)Door |
| What 5 things can forces make an object do? | 1)Speed up2)Slow down3)Change direction4)Turn5)Change shape |
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