Four forces act on Toni and the bike while she rides: weight, support, friction and push.

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Presentation transcript:

More misconceptions Friction and electrical resistance Catherine Low Rangi Ruru Girls’ School

Four forces act on Toni and the bike while she rides: weight, support, friction and push. On the diagram below, draw in arrows to show the directions of ALL FOUR forces acting on Toni and the bike. Label the forces.

SUPPORT FRICTION PUSH WEIGHT /GRAVITY

PUSH PUSH PUSH SUPPORT SUPPORT FRICTION WEIGHT /GRAVITY FRICTION

FRICTION Static Surface friction Kinetic Fluid friction/Drag

Common phrase: FRICTION OPPOSES MOTION More correct: (surface) FRICTION OPPOSES SLIDING Drag opposes the relative motion of the object through the air

KINETIC FRICTION STATIC FRICTION sliding Kinetic friction Direction object WOULD slide if there was no grip Static friction

SUPPORT STATIC FRICTION FRICTION DRAG PUSH WEIGHT /GRAVITY

Constant speed Accelerating braking

Rolling resistance Support force Direction of motion

Rolling resistance Direction of motion Overall support force

SUPPORT STATIC FRICTION DRAG WEIGHT /GRAVITY

SUPPORT STATIC FRICTION GRIP TRACTION DRAG RESISTANCE WEIGHT /GRAVITY

SUPPORT DRAG STATIC FRICTION WEIGHT /GRAVITY

Explain how the effect of the spikes on the sport shoes changes the effect of forces acting on the athlete and how this leads to an improvement in performance. Answer: Spikes on shoes increase the effect of friction. Resulting in a greater reaction/push/thrust force.

ELECTRICAL RESISTANCE R = Slope of the V vs I graph OR

Ohmic conductors – not an issue V I

The diagram below is a graph showing the voltage – current characteristics of a particular diode. State what physical quantity is represented by the gradient of the graph line. Answer: Resistance

Resistance = how hard it is to push charges through the device

V I V I V I

Halliday, Resnick, Walker

Serway

Direction you want to go STATIC FRICTION Direction of sliding