Page 1 - Home Assignment

SAI INTERNATIONAL SCHOOL

CLASS-IX PHYSICS HOME ASSIGNMENT-5

Q1) Fill in the blanks
a) When an object moves in a circular path at a constant speed then motion of the

object is called as_____________

b) In uniform circular motion speed of the particle is ______ but its velocity is_____

c) Uniform circular motion is an ________ motion.

Q2) State True/False

a) When a body moves in circular path with uniform speed , it's motion is called uniform

circular motion.

b) Uniform circular motion is not an accelerated motion.

c) Motion of artificial satellites around the earth is an example of uniform circular motion.

SUBJECTIVE

1. An artificial satellite is moving in a circular orbit of radius 36,000 km. Calculate its

speed if it takes 24 hours to revolve around the earth.

2. An artificial satellite is moving in a circular orbit of radius 42250 km (approx).
Calculate its linear velocity if takes 24 hour to revolve around earth.?

3. Find the linear speed of the tip of a minute hand clock, if the hand is 7 cm long.
4. The tip of seconds’ hand of a dock takes 60 seconds to move once on the circular

dial of the clock. If the radius of the dial of the clock be 10.5 cm, calculate the speed of

the tip of the seconds’ hand of the clock. (Given ).
5. What is meant by uniform circular motion ? Give two examples of uniform circular

motion.

LAB ACTIVITY