Forces in motion

Cards (7)

  • Newton's first law:
    • an object will remain in the same state of motion unless acted on by an external force.
  • This tendency for objects to continue in the same state of motion is called inertia.
  • Distance-Time Graphs
    If an object is accelerating, the distance-time graph will be a curve.
    For an accelerating object, its speed at a particular time is found by:
    • drawing a tangent to the curve at the point in time
    • working out the gradient of the tangent.
  • Velocity = speed of an object in a given direction.
  • Velocity:
    • When travelling in a straight line, an object with constant speed also has constant velocity.
  • Velocity:
    If the object is not travelling in a straight line, e.g. it is turning
    a corner:
    • the speed can still be constant
    • the velocity will change, because the direction has changed.
  • Velocity-
    An object moving in a circle:
    • is constantly changing direction, so it is constantly changing velocity
    • is accelerating even if it is travelling at constant speed.