Which one of the following is most likely not a case of uniform circular motion?

A. motion of the earth around the sun

B. motion of a toy train on a circular track

C. motion of a racing car on a circular track

D. motion of hours’ hand on the dial of a clock

A student draws a distance-time graph for a moving object shown here, the part which indicates uniform deceleration of the object is :

A. ST B. QR

C. RS D. PQ

A student draws a distance-time graph for a moving scooter and finds that a section of the graph is a horizontal line parallel to the time axis. Which of the following conclusion is correct about this section of the graph?

A. the scooter has uniform speed in this section

B. the distance travelled by scooter is the maximum in this section

C. the distance travelled by the scooter is the minimum in this section

D. the distance travelled by the scooter is zero in this section

Fig 8.11 shows the distance-time graph of three objects A,B and C. Study the graph and answer the following questions:

(a) Which of the three is travelling the fastest?

(b) Are all three ever at the same point on the road?

(c) How far has C travelled when B passes A?

(d) How far has B travelled by the time it passes C?

The speed-time graph for a car is shown is Fig. 8.12.

(a) Find how far does the car travel in the first 4 seconds. Shade the area on the graph that represents the distance travelled by the car during the period.

(b) Which part of the graph represents uniform motion of the car?