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FORCES (Effects of forces (Start or stop the motion of an object, Change…

- - - - Definition
        
        Weight is the amount of gravitational force acting on an object.
        
        Mass is the amount of matter in an object
- - - - Help to do work
        
        Wind turns windmill
        
        Water turns water wheels
    - - Cause destruction
        
        Volcano eruption 🌋
        
        Tsunami or tidal waves
- - - - Exists between surfaces that are rubbing against each other
      - Reduces speed of moving objects
      - Produces heat
      - Opposes motion
        
        Rougher surfaces
        
        Greater friction
        
        Produces more heat
    - - Allows us to control movement
      - Reduces slipping
      - Produces heat
    - - Wear and tear
      - Machines work less efficiently
        
        Make things overheat
        
        Object move slowly
- - - - A pulling force
      - Causes magnets to attract magnetic materials
      - Causes magnets to attract unlike poles of other magnets
      - Can use for testing if an object is a magnetic material
      - Cannot use to test if an object is a magnet
    - - Can be used to test if an object is a magnet or a magnetic material
      - A pushing force
      - Causes magnets to repel like poles of other magnets