Newton’s Laws And Applications

Question 1

Weight (Fg)

Answer 1

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

Question 2

How do you calculate weight (Fg)?

Answer 2

Fg = m.g
g = 9,8 m.s^-2

Question 3

What is g?

Answer 3

The acceleration due to gravity.
Near the surface of the earth the value is 9,8m.s^-2.

Question 4

Normal Force (FN)

Answer 4

The perpendicular force exerted by a surface on an object in contact with it.

Question 5

Frictional force (Ff)

Answer 5

The force that opposes the motion of
an object.

Question 6

Which direction does frictional force due to a surface act if the object is in contact with the surface?

Answer 6

Frictional force due to a surface acts parallel to the surface with which the object is in contact.

Question 7

What is meant by maximum static friction?

Answer 7

Maximum static friction refers to the maximum force that can be exerted between two surfaces before they start sliding past each other.

Question 8

What is the difference between static frictional forces and kinetic frictional forces?

Answer 8

Condition: Static friction acts when there is no relative motion between the surfaces (object is at rest), while kinetic friction acts when the surfaces are sliding against each other.

Magnitude: The maximum static friction is typically greater than kinetic friction. Static friction can vary up to its maximum value, whereas kinetic friction is constant for a given pair of surfaces.

Application: Static friction is relevant in situations where motion is about to start, while kinetic friction is relevant when motion is already occurring.

Question 9

Newton’s First Law

Answer 9

An object continues in a state of rest or uniform (moving with constant) velocity unless it is acted upon by a net or resultant force.

Question 10

Inertia

Answer 10

The property of an object that causes it to resist a change in its state of rest or uniform motion.

Question 11

Newton’s Second Law

Answer 11

When a net force, Fnet, is applied to an object of mass, m, it accelerates in the direction of the net force. The acceleration, a, is directly proportional to the net force and inversely proportional to the mass. (Fnet = m.a)

Question 12

Newton’s Third Law

Answer 12

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