Copy of Circular motion 3d for IGCSE Physics

Complete the sentences by selecting the correct ending : (i) When a mass moves in a circle at a steady speed the centripetal force is larger if the :

When a mass moves in a circle at a steady speed the centripetal force is larger if the :

An apple is whirled round in a horizontal circle on the end of a string which is tied to the stalk. It is whirled faster and faster and at a certain speed the apple is torn from the stalk. Suggest reasons why ? [1 Mark]

A car rounding a bend travels in an arc of a circle. a) What provides the centripetal force?

b) Is a larger or a smaller centripetal force required if

1. the car travels faster
2. the bend is less curved,
3. the car has more passengers?

a. Which force provides the centripetal force? [1 Mark]

b. In which direction does this force act? [1 Mark]

c. What is the direction of the acceleration of the object [1 Mark]

d. Describe the motion of the object if the rope is cut [2 Mark]

Which description of the forces acting on the car is correct? [1 Mark]

1. Draw an arrow on Fig. 7.1 to show the direction of this force. (Use the arrow tool ) [2 Marks]

(ii) The speed of the car increases. State what happens to the magnitude of this force. [1 Mark]

(i) - On Fig. 7.1, draw an arrow to show the direction of travel after it has left the track. [1 Mark]

(ii) In terms of the forces acting on the car, suggest why it left the track at P. [2 Mark]

Your answer:A