3. Centripetal force is a force that acts on a body in ____________ and acts at a direction ________ the centre of the circle.

4. Which of the following laws states that the orbits of the planets are ellipses with the Sun at one of its focus ?

2. Kepler's Second Law states that a line joining the planet with sun sweeps over _______ areas in _______ intervals of time as planet moves in orbit.

3. Kepler's Third Law states that the square of the orbital period of any planet is __________ to the cube of the radius of its orbit.

7. Escape velocity is the __________ velocity needed by an object on the surface of the Earth to overcome the gravitational force and escape to outer space.

8. Choose the correct satellite based on described definition : A satellite that revolve around the Earth at the same speed as the Earth’s orbit.

Velocity is the rate of change of ________.

Acceleration is the rate of change of ________ .

Weight is the _________ acting on the object.

Temperature is the measure of the __________ of an object.

Heat is a form of ________ that transferred from a hot object to a cold object.

Thermal equilibrium occurs when net heat flow is ______.

Thermal equilibrium occurs when temperature is ______ .

Heat capacity is the amount of _______ required to _________ the temperature of a material by 1 degree celcius.

Specific heat capacity is the amount of heat required to increase the temperature __________ of the substance by 1 ℃

Latent heat is the amount of heat required to change the _______ of 1kg of a substance at a _________ temperature.

Specific latent heat of fusion is the amount of heat required to change 1kg of the substance from _______ to ______ phase without a change in temperature.