An introduction to levers Featuring Wile e Coyote.

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Presentation transcript:

An introduction to levers Featuring Wile e Coyote

pivot Moment Force

Where is the pivot?

5N Force 3. Which direction will the .What does see-saw turn? this number Mean? 2. What is this? A pivot Anti-clockwise Force

How can we increase the size of the moment (the turning effect)? Pivot Distance from force to pivot Force (effort)

How are force, distance and moment related? moment F x d

10cm 5N 50Ncm pivot Calculate the moment (turning effect) of the force applied to the see-saw. Give the units.

5cm 5N 25Ncm pivot Calculate the moment (turning effect) of the force applied to the see-saw. Give the units.

10cm 100Ncm 10N pivot Calculate the moment (turning effect) of the force applied to the see-saw. Give the units.

2m Moment = 500Nm pivot 250N Force

That's all folks

To use calculations to explain why objects can be balanced. 2. To calculate how to balance moments Objectives: Level 7

10m 10m 10N 10N pivot The moments of the forces are balanced. Left Moment Right Moment 100Nm 100Nm 10N 10N pivot The moments of the forces are balanced. The see-saw is BALANCED. But why?

10m 7m 10N 10N pivot The moment of force on the left is bigger Right Moment 100Nm 70Nm 10N 10N pivot But what happens if the blue dragon moves in a little? The moment of force on the left is bigger

10m 10m 20N 10N pivot The see-saw is BALANCED. But why? Left Moment Right Moment 100Nm 200Nm 20N 10N pivot The moment of the force is greater on the right The see-saw is BALANCED. But why?

But can we balance them both again? How? Left Moment Right Moment 100Nm 100Nm 20N 10N pivot But can we balance them both again? How?

4m 10m 200N 500N

4m 2.5m 640N 400N

Where should the loading platform be on the loading arm to carry each load safely?

Moments and Levers Answer these :- 1. What is the moment of this force ? 2. What is the moment of this force? 3. What is the length of this lever if the moment is 8 Nm ?

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8m 14Kg 3Kg 60m All of these see-saws are balanced. Work out the missing number for each one. 8m 14Kg 3Kg 60m