Speed - Resistance

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Speed - Resistance - Presentation Transcript

Speed
Never forget, when working out a speed, from a given set of figures and digits, this is your formula.
DISTANCE
SPEED =
TIME
So if I ran 200m in 29 seconds my average speed would have been:
200m ÷ 29 = 6.8 m/s (metres per second or MPS)
Try these out!
PersonDistanceTime (seconds)Speed (m/s)A200m296.8m/sB500m130C1500m320D100m12E1000m280F3565.8m/s
440055017780Some tests use graph form Accelerating (Going faster) Decelerating (Slowing down) -8572527305
Resistance
Air Resistance (drag) : This is caused by friction, when an object moves through the air. E.g. - A race car.
1895475369570Tiny particles hit the surface of the moving object and cause it to slow down.
Air resistance
Air resistance is force acting against the force moving the object forward. So if the racing car is moving forward, air resistance is pushing it back.
31432586360
If the air resistance was stronger, the car would not move very fast.
92392557150
Water resistance –
The water particles slow down the object as it moves across or through the water. It is very similar to water resistance. That is why you run slower in water. Water resistance is acting against the force moving forward.
Facts you must know about Air resistance:
Air resistance gets greater when an object moves faster
Air resistance can be reduced by using (streamlined) aerodynamic shapes.
Streamlining also works when travelling through water.

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