A manufacturer tests a magnetic brake for a roller-coaster launch system. Fig. 1 shows a metal fin on the car passing between two strong permanent magnets. ...
Question 1 Report
A manufacturer tests a magnetic brake for a roller-coaster launch system. Fig. 1 shows a metal fin on the car passing between two strong permanent magnets. The fin does not touch the magnets. As the fin moves, currents are induced in it. These currents produce a magnetic effect that opposes the motion of the fin, slowing the car. The system is useful because there is no rubbing contact to wear away. The brake force is greatest when the car is moving quickly.
(a) What type of current is induced in the moving fin? [1]
(b) Which energy store of the moving car decreases as it slows? [1]
(c) When the car moves faster, what happens to the braking force? [1]
(d) Sketch why the brake can work without the fin touching the magnets. [1]
(e) What advantage does no contact give to the brake system? [1]
(f) Which change would reduce the braking force? [1]
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