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
