Mechanics

Question 1

Normal Force

Answer 1

The force or the component of a force which a surface exerts on an object with which it is in contact and which is perpendicular to the surface

Question 2

Frictional force

Answer 2

The force that opposes the tendency of motion of an object and which acts parallel to the surface

Question 3

Static frictional force

Answer 3

The force that opposes the tendency of motion of a stationary object relative to a surface

Question 4

Kinetic frictional force

Answer 4

The force that opposes the motion of a moving object relative to a surface

Question 5

Newton’s first law of motion

Answer 5

A body will remain in its state of rest or motion at constant velocity unless a non- zero resultant/net force acts on it

Question 6

Newton’s second law of motion

Answer 6

When a net force acts on an object, the object will accelerate in the direction of the force at an acceleration directly proportional to the force and inversely proportional to the mass of the object

Question 7

Newton’s third law of motion

Answer 7

When object A exerts a force on object B, object B Simultaneously exerts an oppositely directed force of equal magnitude on object A

Question 8

Newton’s law of universal Gravitational

Answer 8

Each body in the universe attracts every other body with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres

Question 9

Weight

Answer 9

The gravitational force the Earth exerts on any object on or near its surface

Question 10

Acceleration

Answer 10

Rate of change of velocity

Question 11

Isolated system

Answer 11

A system on which the resultant/ net external force is zero