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A revision quiz to prepare for LO3.

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A machine is a [[1]] that can change the magnitude or [[0]] of a force.

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Torque is a [[0]] of the rotational [[1]] applied to an object .

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Mechanical efficiency is the ratio of the [[0]] to the [[1]] .

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Mechanical advantage (MA) is the ratio of the force [[0]] by a machine to the force [[1]] applied to it.

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Velocity ratio (VR) is the ratio of the distance moved by the [[0]] to the distance moved by the [[1]] .

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A pulley system is shown in the diagram.

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Distance moved by effort

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Distance moved by load.

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Mass of load

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Effort in newtons.

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State the value of the machine velocity ratio if the effort moves {dE}mm and the load moves {dL}mm.

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If the mass being lifted by the pulley is {load}kg and the force required on the rope is {effort}N, calculate the percentage efficiency of the pulley system.

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A pulley system is shown in the diagram.

Distance moved by effort

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Distance moved by load.

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Mass of load

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Effort in newtons.

State the value of the machine velocity ratio if the effort moves {dE}mm and the load moves {dL}mm.

If the mass being lifted by the pulley is {load}kg and the force required on the rope is {effort}N, calculate the percentage efficiency of the pulley system.

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A pulley system is shown in the diagram.

Distance moved by effort

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Mass of load

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Effort in newtons.

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State the value of the machine velocity ratio if the effort moves {dE}mm and the load moves {dE}mm.

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If the mass being lifted by the pulley is {load}kg and the force required on the rope is {effort}N, calculate the percentage efficiency of the pulley system.

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A wheelbarrow is shown in the diagram below:

Distance moved by effort

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Distance moved by load.

", "templateType": "randrange", "can_override": false}, "load": {"name": "load", "group": "Forces", "definition": "random(20 .. 30#1)", "description": "

Mass of load

", "templateType": "randrange", "can_override": false}, "effort": {"name": "effort", "group": "Forces", "definition": "random(150 .. 180#2)", "description": "

Effort in newtons.

State the value of the velocity ratio if an upwards effort of {dE}cm lifts the load {dL}cm.

If the mass of the load is {load}kg and the effort required is {effort}N, calculate the percentage efficiency of the system.

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A bolt requires a torque of {torque}Nm to be securely fixed. The spanner used to secure the bolt has a working length of {len}cm.

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Torque to tighten bolt.

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Spanner turning radius

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Calculate how much force, in Newtons, would be required on the end of the spanner to secure the bolt.

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A nut requires a torque of {torque}Nm to be securely fixed. A force of {force}N is applied to the spanner to tighten it.

Torque to tighten bolt.

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How far, in millimetres, from the nut centre must the force have been applied if the required torque was reached?

A nut requires a torque of {torque}Nm to be securely fixed. A force of {force}N is applied to the spanner to tighten it.

Torque to tighten bolt.

How far, in millimetres, from the nut centre must the force have been applied if the required torque was reached?

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