• Created by: Sagaana
  • Created on: 07-01-19 16:42
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  • Mechanics
    • On the Move
      • Speed and Velocity
        • Displacement is the distance in a given direction where as distance is how far something has travelled
        • displacement is a vector where as distance is just a scalar.
        • Instantaneous speed is the  exact speed that a body is moving at a given instant in time.It is the true measure of the body's motion for that point in time .
        • Average speed-it tells you how much distance a body covers over a certain amount of time.It doesn't tell u about the actual motion of the body.
        • Velocity is more useful in the sense that it is necessary to calculate forces, acceleration and more.This is because it also take direction into account.
      • Acceleration
        • It is defined as the rate of change of velocity per unit time.
        • deceleration is the rate of which object at which an object slows down.
        • Uniform acceleration is where the velocity of an object moving along a straight line changes at a constant rate.
        • Acceleration is a vector as it has both magnitude and direction.
      • Free Fall
        • Free falling is falling under the sole influence of gravity.It is any object that is acted upon only by the force of gravity.
        • Due to gravitational Acceleration is acting on the object .This mean that velocity of the object will also increase
        • object with different masses or size will fall with the same acceleration Galileo's reasoning was that it any number  of identical object fall at the same rate as rest put together so he concluded that any two objects must fall at the same rate no matter what it weigh or size of the object is.
      • Motion Graphs
        • Distance time graph show how far an object has travelled. Whereas a displacement time graph shows where the object it.
        • The Gradient of the velocity time graph represents acceleration.
        • The area under the velocity time graph shows the displacement of an object from its starting point.
      • Projectile motion
        • A projectile is any object acted upon only by the force of gravity. Therefore projectile is always vertically downwards.
        • The Horizontal velocity of the object is constant because acceleration of the object doesn't have a horizontal component
        • To find the Horizontal component of a vertical vector.???
        • We would see projectile motion in a path of a ball rolling across a inclined plane  and you would also be able to see it when a beam of electron is directed between two opposite charged parallel plates.
        • If we could turn off gravity an object that is projected in the air would travel in a straight line  with no changes to its velocity.
        • Air Resistance effects: The drag force acts in the opposite direction to the direction of motion it also has a horizontal component that reduces the horizontal speed of the projectile
          • It reduces the max height of the projectile if its initial direction is above the horizontal


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