Physics Unit 2

First two subjects forces and motion. From the AQA revision guide, physics.

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  • Created on: 09-12-12 18:07
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  • Physics Unit 2
    • Motion
      • Distance Time Graphs
        • Graphs can help describe the motion of an object.
        • A distance Time Graph shows the distance of an object from a starting point against the time taken.
        • The speed of an object is the distance travelled each second.
        • The gradient of a line on a distance time graph represents speed.
          • The steeper the gradient, the greater the speed.
        • If an object is stationary on a distance time graph, the line is horizontal.
        • If an object is moving at a constant speed the line on a distance time graph is straight that slopes upwards.
        • The speed of an object can be calculated.
          • Speed=  Distance travelled/ time taken
      • Velocity and Accelaration
        • The velocity of an object is its speed in a given direction.
          • if an object changes direction, it changes velocity even if the speed stays the same.
            • If the velocity of an object changes we say it accelerates.
        • Acceleration= (final velocity - initial velocity)/time taken for the change
        • If the value for acceleration is negative the object is decelerating.
          • Deceleration is  the same as slowing down.
            • It is the same as negative acceleration.
      • Velocity Time Graphs
        • Velocity Time Graphs shows the velocity of an object against the time taken.
        • The gradient of the line on a velocity time graph represents acceleration.
          • The steeper the gradient the greater the acceleration.
        • If the line on a velocity time graph is horizontal, acceleration is zero meaning the object is travelling at a steady speed.
        • if the gradient of the line is negative then the object is decelerating.
        • The area under the line on a velocity time graph represents the distance travelled in a given time.
          • The bigger the area the greater the distance travelled.

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