# IGCSE Forces

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 Author: SilcoatesScience ID: 298275 Filename: IGCSE Forces Updated: 2015-04-08 10:11:17 Tags: Forces Folders: Description: Forces Show Answers:

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1. By which two ways can objects be made more stable?
• a wider base
• a lower centre of mass
2. How can you find the centre of mass of a symmetrical object?
• Find where the lines of symmetry intersect
3. 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.
4. What is the turning effect of a force called?
The moment
5. 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)
6. If an object is not rotating, what does it say about the total anticlockwise moment and the total clockwise moment?
They are balanced
7. In a liquid, which is transmitted equally in all directions: pressure or force?
Pressure
8. What is the Pascal (Pa) the unit of?
Pressure
9. In the equation

what does A represent?
The cross-sectional area (in metres squared)
10. In which direction does centripetal force act?
• Towards the centre of the circle
11. What is the force called that keeps objects moving in a circle?
• Centripetal force
12. What 3 things increase the size of the centripetal force required to keep objects moving in circular motion?
• Increased mass
• Increased speed