Ch 8 Motion

If the displacement of an object is proportional to square of time, then the object moves with:

• Uniform velocity

• Uniform acceleration

• Increasing acceleration

• Decreasing acceleration

From the given v-t graph, it can be inferred that the object is

• At rest

• In uniform motion

• Moving with uniform acceleration

• In non-uniform motion

Suppose a boy is enjoying a ride on a marry-go-round which is moving with a constant speed of 10 m/s. It implies that the boy is:

• At rest

• Moving with no acceleration

• In accelerated motion

• Moving with uniform velocity

A particle is moving in a circular path of radius r.

• Zero

• πr

• 2r

• 2πr

Which of the following can sometimes be ‘zero’ for a moving body?

i. Average velocity

ii. Distance travelled

iii. Average speed

iv. Displacement

• Only (i)

• (i) and (ii)

• (i) and (iv)

• Only (iv)

Which of the following statement is correct regarding velocity and speed of a moving body?

• Velocity of a moving body is always higher than its speed

• Speed of a moving body is always higher than its velocity

• Speed of a moving body is its velocity in a given direction

• Velocity of a moving body is its speed in a given direction

When a car driver travelling at a speed of 10 m/s applies brakes and brings the car to rest in 20 s, then the retardation will be:

• + 2 m/s²

• − 2 m/s²

• − 0.5 m/s²

• + 0.5 m/s²

The speed - time graph of a car is given here. Using the data in the graph calculate the total distance covered by the car.

• 1250 m

• 875 m

• 1500 m

• 870 m

A car of mass 1000 kg is moving with a velocity of 10 m/s. If the velocity-time graph for this car is a horizontal line parallel to the time axis, then the velocity of the car at the end of 25 s will be:

• 40 m/s

• 25 m/s

• 10 m/s

• 250 m/s

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

• Motion of the earth around the sun

• Motion of a toy train on a circular track

• Motion of a racing car on a circular track

• Motion of hours’ hand on the dial of a clock