Flashcards
Exploring centripetal forces
Cards in this deck (9)
- 1How do you get the equation for centripetal forceCombine F=ma with a = v*2 / r to get F = mv*2/r
- 2When is force directly proportional to v*2When the mass and radius are constant
- 3How do yo derive an equation for centripetal acceleration with angular velocityV = wr,substitute this into F = mv*2/r to get F = mw*2 r
- 4Name one way to investigate circular motion practicallyA length of string with a bung at one and and a given mass on the other, threaded through a glass tube, with a paper lip attatched just under the tube
- 5What is a centrifugeA centrifuge is a machine with a rapidly rotating container that applies centrifugal force to its contents, typically to separate fluids of different densities.
- 6How do centrifuges workAs the liquids are spun at very high speeds, the particles seperate out as the tube holding them is spoon. When spinning the tubes swing out to be horizontal, so particles with a greater mass require greater centripetal force to follow the circular path, so move outwards to the bottom of the tube and vice versa
- 7Give 2 practical applications for centrifugesSeparating cream from milk, red blood cells from plasma, different uranium isotopes
- 8Why are velodrome tracks banked?On the banked part, a horizontal component of the normal contact force, together with the frictional force from the tyres provide the necessary centripetal force required for higher speeds
- 9Explain the changes in forces on a Ferris wheelWhen capsule is stationary, normal contact force (N) = weight (mg). When wheel rotates, a net force is required to Tavel in a circular path. At the top of the circle, centripetal force acts down, so mg>N, so centripetal force is mg-N, so feel lighter because normal reaction fore is smaller, and vice versa
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- physics A level (M5 Chapter 16 Circular motion ) Flashcards on Exploring centripetal forces, created by lizabeth rawson on 27/09/2021.
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- lizabeth rawson
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