the effect of forces

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  • Created by: Nadia
  • Created on: 20-12-12 18:19
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  • The effect of Forces
    • weight is the force of gravity acting on the mass of an object
      • on Earth's surface, 1kg of mass has a weight of 10N; this is the gravitational field strength (g)
    • Newton's first law of motion states that an object at rest stays at rest/ an object in motion stays in motion with the same speed + direction unless acted upon by an unbalanced force
      • this can be investigated experimentally e.g. air track + datalogger
    • the mass of an object affects how easy or difficult it is to change the movement of that object
      • massive bodies have a large amount of inertia, so require a large force to change their motion/ make them move when they're stationary
    • the momentum of an object is its mass (kg) multiplied by its velocity (m/s)
      • the units of momentum are kg m/s
    • Newton's second law of motion states that force = mass x acceleration
      • the acceleration of an object is directly proportional to the resultant force and inversely proportional to the object's mass
      • in terms of motion, this becomes: force = rate of change in momentum divided by time taken
    • when an object falls through the air, first it accelerates + increases in speed because the force of gravity is acting on it
      • however,then air resistance (force of friction) increases causing the object to decelerate
        • eventually the air resistance force equals the weight of the object and its falling at terminal velocity

Comments

Miss KHP


Designed for the WJEC exam board but can be used with other exam boards too (such as AQA Additional Science, OCR and Edexcel).

A nice and clear mind map to help you revise this topic and ensure you don't forget any of the key points.

Once you have completed revising the mind map, test yourself.

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