Speeding Up

Speeding Up

Definition
1. Speed is how fast something moves.
  1. Speed tells you distance traveled in a certain time.
  2. average speed= distance (divided by) time
Units
1. Units of speed include: m/s, mph, and km/h.
  1. Ways to measure speed
    1. miles per hour
      1. mph
        Most common unit
        used for measuring car speeds or horses e.t.c
    2. Mach number
      1. speed divided by speed of sound
        Used to compare how fast something is going to the speed of sound
    3. kilometres per hour
      1. km/h
        Used for cars
    4. metres per second
      1. m/s
        Used for sprinting races
    5. feet per second
      1. ft/s
        Used for sprinting races sometimes
    6. knots (nautical miles per hour)
      1. kn or kt
        Used for aeroplanes
Balanced Forces
1. When all forces acting on an object balance then it can be:
  1. Moving at a constant speed in a straight line.
  2. Stationary.
Unbalanced Forces
1. An unbalanced force in the direction of motion causes something to speed up.
  1. When something speeds up we say it accelerates.
  2. An unbalanced force acting in the opposite direction to motion causes something to slow down.
    1. When something slows down we say it decelerates.
Drag
1. When something moves through air or water there are drag (friction) forces.
  1. The size of the drag in air or water depends on the speed.
  2. Streamlining can be used to reduce the drag in air or water.

Resource summary

	Created by lillycherriman about 9 years ago

	Copied by Luke Fields about 9 years ago