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Machines Flashcards

(8 cards)

1
Q

What is a moment?

A

Turning force about a pivot. They will act in clockwise/anti-clockwise direction

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2
Q

When in equilibrium..

A

The anti-clockwise moments = the clockwise moments about a pivot

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3
Q

Calculation for a moment

A

Moment (Nm) = Force(N) x distance from pivot(m)

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4
Q

How do you find the effort in a pulley?

A

Effort = load/no. of ropes

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5
Q

How do you find a class 1 lever?

A

The pivot is in between the load and effort eg a bottle opener

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6
Q

How do you find a class 2 lever?

A

The pivot is on one end, closer to the load eg a wheel barrow

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7
Q

How do you find a class 3 lever?

A

The pivot is on one end, closer to the effort eg an arm lifting a ball

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8
Q

How do you find out the weight a pulley diagram is lifting?

A

Weight=effort x number of ropes

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