Chapter 1

Question 1

What is mechanics

Answer 1

The branch of physical sciences concerned with the study of motion of objects subjected to the action of forces

Question 2

3 branches of Mechanics

Answer 2

Rigid-body mechanics, deformable-body mechanics, fluid mechanics

Question 3

Branches of rigid-body mechanics

Answer 3

Statics, dynamics

Question 4

Rigid body

Answer 4

A body containing large quantity of particles that remain at fixed distances apart before and after the action of a force

Question 5

Statics

Answer 5

Study of bodies in equilibrium…study of bodies at rest or moving with constant velocity

Question 6

Dynamics

Answer 6

Study of accelerated motion of bodies

Question 7

Length

Answer 7

Locates the specific position of an object in space, and used to quantify the size of a physical system

Question 8

Time

Answer 8

Conceived as a succession of events from past through present to future

Question 9

Mass

Answer 9

A measure of the quantity of matter used to compare the action of one body to that of another

Question 10

Force

Answer 10

A pull or push exerted by one body on another

Question 11

Particle

Answer 11

Any object with mass but a negligible size

Question 12

Conc force

Answer 12

The effect of loading which is assumed to act at a point on a body

Question 13

Newton’s first law of motion

Answer 13

A particle originally at rest or moving along a straight line with a constant velocity tends to remain in this state unless subjected to an external unbalanced force

Question 14

Newton’s 2nd

Answer 14

The time rate of change of linear momentum of a particle subjected to an unbalanced force is directly proportional to the mag of the force and acts in the direction of the force

Question 15

Newton’s 3rd

Answer 15

The mutual forces of action and reaction b/n two bodies are equal, opposite and collinear

Question 16

Newton’s law of universal grav

Answer 16

Any two particles in universe attract each other with a force proportional to the product of their masses and inversely proportional to the square of distance b/n their centres

Question 17

What is a dimensionally homogenous equation

Answer 17

One that has each term expressed in the same units

Question 18

Weight

Answer 18

Gravitational attraction of the earth on a body

Question 19

Scalar

Answer 19

A positive or negative physical quantity that can be completely specified by its magnitude

Question 20

Vector

Answer 20

A physical quantity that requires both magnitude and direction for complete description