motion class 9 part 1

A particle is moving in a circular path of radius r. The displacement after half circle will be

• r

• 2r

• zero

• 2.ƛ r

Which 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

From the given υ – t graph, it can be inferred that the object is

• uniform motion

• at rest

• in non-uniform motion

• moving with uniform acceleration

Four cars A, B, C and D are moving on a levelled road. Their distance versus time graphs are shown in the adjacent figure. Choose the correct statement.

• Car A is faster than car D.

• Car B is the slowest.

• Car D is faster than car C.

• Car C is the slowest.

Which of the following figures correctly represents uniform motion of a moving object?

• a

• b

• c

• d

Velocity-time graph of an object is given below. The object has

• Uniform velocity

• Uniform speed

• Uniform retardation

• Variable acceleration

Which one of the following graphs shows the object to be stationary?

• a

• b

• c

• d

A worker covers a distance of 40 km from his house to his place of work, and 10 km towards his house back. Then the displacement covered by the worker in the whole trip is

• zero km

• 10 km

• 30 km

• 50 km

Rate of change of displacement is called

• Speed

• Deceleration

• Acceleration

• Velocity

SI Unit of measurement of acceleration is

• m/s

• m/s²

• m/hr

• M