Unit 1 - Laws of Motion

Unit 1        -         Laws of Motion

One word answers

1.       Mechanics is the branch of physics that deals with effect of force on bodies.

2.       Statics deals with the bodies, which are at rest under the action of forces.

3.        Dynamics is the study of moving bodies under the action of forces.

4.        Kinematics deals with the motion of bodies without considering the cause of motion.

5.        Linear momentum = mass x velocity.

6.        Unit of momentum in SI system is km m/s.

7.        Unit of momentum in C.G.S. system is g cm/s.

8.       Based on the direction in forces can be classified into like and unlike parallel forces.

9.        Unit of torque in SI system is N m.

10.    Unit of moment of couple in SI system is N m.

11.    Unit of moment of couple in C.G.S. system is Dyne cm.

12.    Unit of force in SI system is Newton.

13.    Unit of force in C.G.S. system is Dyne.

14.    Weight = mass x acceleration due to gravity.

15.    Surface of the moon is 1.625 m seconds square