1. The SI unit of force is

2. In scalar, there is only addition and subtraction of

3. If two forces of 20 N towards the north and 12 N towards the south are acting on an object, the resultant force will be

4. Density is a

5. The gravitational field strength of the moon is

6. Exertion of pull or push on an object is termed as

7. The mass of a car is 500 kg and it is lifted up by a crane to a height of 200 m. Given that gravity is 10 $Nkg^{-1}$, the gravitational kinetic energy $(E_{k})$ of the car is

8. Work is defined as

9. A girl accidentally dropped her mobile phone from the balcony. If the mass of the mobile phone is 0.6 kg and the height from where it was dropped is 120 m, keeping in mind the gravitational pull of the earth, the potential energy $(E_{p})$ of the mobile phone is

10. Electromagnetic waves obey the law of