P. Newton's Laws

Question 1

State Newton’s first law

Answer 1

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

Question 2

State Newton’s second law

Answer 2

When a non-zero net force acts on an object, the object will accelerate in the direction of the force and the acceleration is directly proportional to the force and inversely proportional to the mass of the object.

Question 3

State Newton’s third law

Answer 3

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

Question 4

State Newton’s Law of Universal Gravitation

Answer 4

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 5

Describe weight

Answer 5

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

Question 6

Define Normal force

Answer 6

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

Question 7

Define Frictional force

Answer 7

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

Question 8

Define Static Frictional force

Answer 8

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

Question 9

Define Kinetic Frictional force

Answer 9

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