Advertisements
Advertisements
प्रश्न
Which of the following quantity remains constant in uniform circular motion:
पर्याय
Velocity
Speed
Acceleration
Both velocity and speed
Advertisements
उत्तर
Speed
Speed is scalar but velocity and acceleration are vector quantities. So, speed remains constant but velocity and acceleration change with the change in direction, and in the circular motion the direction of motion changes at every point.
संबंधित प्रश्न
Earth moves around the sun with uniform velocity.
Draw a neat labelled diagram for a particle moving in a circular path with a constant speed. In you diagram show the direction of velocity at any instant.
A piece of stone tied at the end of a thread is whirled in a horizontal circle with uniform speed by hand. Answer the following questions:
- Is the velocity of stone uniform or variable?
- Is the acceleration of stone uniform or variable?
- What is the direction of acceleration of stone at any instant?
- Which force provides the centripetal force required for circular motion?
- Name the force and its direction which acts on the hand.
| A small pebble tied at one end of a string is placed near the periphery of a circular disc, at the centre of which the other end of the string is tied to a peg. The disc is rotating about an axis passing through its centre. |
- What will be your observation when you are standing outside the disc? Explain.
- What will be your observation when you are standing at the centre of the disc? Explain.
Solve the following problem.
A car moves in a circle at a constant speed of 50 m/s and completes one revolution in 40 s. Determine the magnitude of the acceleration of the car.
Which one of the following is most likely not a case of uniform circular motion?
What is meant by uniform circular motion? Give two examples of uniform circular motion.
The ratio of the angular speed of minute hand and hour hand of a watch is ____________.
If a body is moving in a circle of radius r with a constant speed v, its angular velocity is ______.
In uniform circular motion, although the speed is constant, why does acceleration occur?
