Answers to AQA GCSE Gears and moments
Practice questions
1.State the definition of a gear
A gear is used to change the moment of a turning effect.
2.Describe the relationship between size of gear cog and the magnitude of the moment produced
As the size of the gear cog increases the magnitude of the moment will also increase
3. A small gear cog is 5cm in diameter and is turned with a force of 40N. This small cog turns a larger cog which has a diamter of 20cm. Calculate the size of the output moment from the larger gear cog.
The force on the two gear wheels is equal in size, but opposite in direction. So, the large gear cog will experience a 40N force
20cm= 0.2m
Moment of large gear cog = 0.2m x 40N = 8Nm
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