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By which two ways can objects be made more stable?
- a wider base
- a lower centre of mass
How can you find the centre of mass of a symmetrical object?
- Find where the lines of symmetry intersect
How can you find the centre of mass of an asymmetrical object?
- Suspend it from any two points and draw vertical lines from the suspension points. The centre of mass will be where the drawn lines intersect.
What is the turning effect of a force called?
What does the turning effect of a force depend upon?
- The size of the force
- The perpendicular distance of the force from the pivot
- (M = F x d)
If an object is not rotating, what does it say about the total anticlockwise moment and the total clockwise moment?
They are balanced
In a liquid, which is transmitted equally in all directions: pressure or force?
What is the Pascal (Pa) the unit of?
In the equation
what does A represent?
The cross-sectional area (in metres squared)
In which direction does centripetal force act?
- Towards the centre of the circle
What is the force called that keeps objects moving in a circle?
- Centripetal force
What 3 things increase the size of the centripetal force required to keep objects moving in circular motion?
- Increased mass
- Increased speed
- Reduced radius
What are the two conditions for a system to be in equilibrium?
No resultant force AND no resultant turning effect
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