Motion Flashcards
Equation for acceleration
Change of velocity / total time
Distinguish between mass and weight
Mass: How much material is present in it Unit) Kg
Weight: Force on the object due to gravity
Equation for Weight
Mass x gravity
Equation for Density
Mass / volume
Equation for Hookes law
Force = constant x extension
What is the term ‘limit of proportionality’
The point when the extension is no longer proportional to the load.
What is friction
A force between two surfaces which impedes motion and results in heating
Balanced forces
If two forces are balanced
- the object is stationary
- the object is moving at a constant speed
- There is no resultant force when balanced
When does forces balance
When their magnitude is the same, but they act in opposite directions
Unbalanced forces
An objects speed or direction of movement changes
- You can find the resultant force by adding them up
Examples of the turning effect
Tightening a nut, pushing a door handle, A child sitting on the end of the seesaw
Equation for moment
Force x distance from pivot
What is the principle of moments?
If an object is not turning, the sum of the clockwise and the sums of the anti-clockwise moments equals
Equation for pressure
Force / Area
