Galileo's experiments show that a constant unbalanced force is re3quired to keep a body moving in uniform motion.

Fill in the blanks: An __ force is required to keep a body in uniform circular motion.

Name a physical quantity which remains constant when a body moves in a uniform circular motion.

If a body is moving with a constant angular velocity ,is it alo moving with a uniform linear velocity?

Name the physical quantities which remains constant for a particle moving along a circular path in a horizontal plane in uniform motion.

The sign of work done by a force on a body is important to understand. State carefully if the following quantities are positive or negative:- work done by an applied force on a body moving on a rough horizontal plane with uniform velocity.

The displacement x of a body of mass 10 kg moving in one dimension under the action of a constant force is related to time by the equation t = sqrtx + 3 . Find the work done by the force in first 5 seconds.

A wheel in uniform motion about an axis passing through its centre and perpendicular to its plane is considered to be in mechanical (translational plus rotational equilibrium because no net external force or torque is required to sustain its motion. However, the particles that constitute the wheel do experience a centripetal acceleration directed towards the centre. How do you reconcile this fact with the wheel being in equilibrium? How would you set a half - wheel into uniform motion about an axis passing through the centre of mass of the wheel and perpendicular to its plane? Wil you require external forces to sustain the motion?