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 |