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# Need help with a simple a level physics question watch

1. someone pls
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2. ignore the ads, they are annoying ik
3. Think about what's happening. The conker is moving with a linear speed of 2.2, and at a given point in time it acts in a single direction. However, since this is circular motion there is a force pulling it back towards the centre that counters the momentum of the conker. So how much work is the string doing to counter that movement?
4. (Original post by Radioactivedecay)
Think about what's happening. The conker is moving with a linear speed of 2.2, and at a given point in time it acts in a single direction. However, since this is circular motion there is a force pulling it back towards the centre that counters the momentum of the conker. So how much work is the string doing to counter that movement?
Actually completely disregard everything I said. Pretty sure its zero since the ball moves in a direction perpendicular to the cetripetal force.
5. (Original post by Radioactivedecay)
Actually completely disregard everything I said. Pretty sure its zero since the ball moves in a direction perpendicular to the cetripetal force.
wow, that was right!

i still dont get why its 0 tho
6. (Original post by Sanjith Hegde123)
wow, that was right!

i still dont get why its 0 tho
When the force is perpindicular to the direction of motion of a object the work done is 0. In circular motion, the centripetal force and the linear velocity are always 90 degrees to each other.
7. (Original post by Radioactivedecay)
When the force is perpindicular to the direction of motion of a object the work done is 0. In circular motion, the centripetal force and the linear velocity are always 90 degrees to each other.
ah, haven't done that in class yet. Cheers tho

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