Flashcards
Physics: Uniform Circular Motion
Cards in this deck (6)
- 1Q: Explain how the banking angle enables the car to travel around the curved section of the ramp without relying on frictionA: the horizontal component of the normal force points towards the centre of the circle, causing centripetal acceleration, thus the car undergoes Uniform Circular Motion.
ALTERNATIVELY: there are two forces acting on the car, the normal force from the surface of the road and the weight of the car. The vector sum of these two forces is a horizontal force towards the centre of the circular path and provides the necessary centripetal force to make the car round the bend. - 2Q: Explain why it is harder for a car to make a given turn at high speeds than low speedsA: A higher speed means that to follow a curve a larger velocity per unit time (thus larger acceleration) is needed, thus a larger force is needed.
Since F=ma=v^2/r - 3Q: Explain why a car can travel faster around a banked curve than it can around a level curve of the same radiusA: A banked curve allows a second force (horizontal component of normal force) to add to the frictional force provided by the road on the tyres. thus a larger force is available and hence a higher speed is possible.
Since F=ma=v^2/r - 4Q: State the cause of the centripetal acceleration of the carA: As the tyres push outwards no the road, the road pushed back on the tyres, perpendicular to the velocity
- 5Q: Explain, in terms of acting forces, what would happen if the road were wet and greasyA: the frictional force perpendicular to the velocity would decrease hence less force would be available to change the direction and the car may slide rather than follow the road.
- 6Q: Describe and explain what would happen if the car travelled around the curve at a speed of less than 10 metres per secondA: with the wheel turned at the same angle the car would move towards the centre of the curve (further down the bank) as the force provided is greater than the force needed to maintain the radius of the path
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- Flashcards on Physics: Uniform Circular Motion, created by nicola.mathews14 on 20/10/2015.
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