26. Kinetic energy is the energy a body has due to its motion. 27. Potential energy is the energy a body has due to its position or condition. 28. Power is the rate at which work is done. 29. Angle, measured in radians, is equal to the arc length divided by the radius. 30. Angular velocity is the rate of change of angle.
31. Linear velocity is the speed of the particle in a direction perpendicular to the radius at that point.
32. Periodic time is the time taken for one complete revolution, cycle or oscillation.
33. Centripetal acceleration is the acceleration of an object travelling in uniform circular motion; it is directed toward the centre of the circle.
34. Centripetal force is the force required to maintain uniform circular motion; it is directed toward the centre of the circle.
35. The elastic constant is the constant of proportionality between the applied force and the resulting displacement of a given spring.
36. Elasticity is the ability of a body to resist a distorting influence or stress and to return to its original size and shape when the stress is removed.
37. Simple harmonic motion is where the acceleration of a body towards a particular point is proportional to displacement from that point.
38. Amplitude is the maximum distance that an object moves from its equilibrium position.
39. Frequency is the number of cycles (or oscillations) the object completes per unit time.
40. The period of a particle executing SHM is the time taken for one complete oscillation.
Heat 1. Temperature is a measure of the hotness or coldness of a body. 2. Heat is the energy due to the movement of the molecules within the body.
3. A thermometric property is a physical property that changes measurably with temperature.
4. The Heat Capacity of a body is the amount of heat required to raise the temper- ature of the body by 1 K.
5. The Specific Heat Capacity of a substance is the amount of heat required to raise the temperature of 1 kg of the substance by 1 K.
6. The Latent Heat of a body is the amount of heat required to change its state without a change in temperature.
7. The specific latent heat of a substance is the amount of heat required to change the state of 1 kg of the substance without a change in temperature.
