What is the formula of potential energy?

What are the conditions needed for work to be done?

i. A force should act on an object.

ii. The object must be displaced.

iii. There should be a chemical energy applied.

Which of the following statements are true?

i. Work done by a force acting on an object is equal to the magnitude of the force multiplied by the distance moved in the direction of force.

ii. Work has only magnitude and no direction.

iii. Here the unit of work is $\mathrm{newton} \mathrm{metre}, \mathrm{joule}.$

iv.There are two conditions need to be satisfied for work to be done.

What is the unit of work?

i.$\text{Newton metre}$

ii.$\text{Joule}$

iii. $\text{Ampere}$

iv. $\text{Coulomb}$

Which statement is correct regarding energy?

i. The energy possessed by an object is measured in terms of its capacity of doing work.

ii. The unit of energy is $\text{Joule}$.

iii.  $1\text{ kJ=100 J}$

Which of the following are the examples of kinetic energy?

i.A falling coconut

ii.A speeding car

iii. A rolling stone

iv. A flying aircraft 

Which of the following are examples of potential energy?

i. Flowing water

ii. Blowing wind

iii. A coiled spring

iv.Wheels on a roller skates before someone skates

Which statement is correct?

i. Power is defined as the rate of doing work or the rate of transfer of energy.

ii. $Power=\frac{Work}{time}$

iii. Unit of power is $\text{watt}$.

iv. $1 \text{W}= 1 \frac{\text{J}}{\text{s}}$

Match column I with column II