Physics - Theory

Question 1

Define Newtons First Law

Answer 1

A body stays in the state of rest or a body continues to be in motion unless an external force is acted on it.

Question 2

What Newtons First law also called?

Answer 2

The Inertia Law

Question 3

Define the law of INERTIA.

Answer 3

Inertia is the tendency of an object to resist a sudden change in its state of motion.

Question 4

The law of Inertia states that……..The greater the _____ of the object, the greater the Inertia.

Answer 4

Mass
Meaning: The more difficult it is to move it when it is at rest and to stop it when it is in motion.

Question 5

A block of mass 2 kg has a constant velocity when it is pushed along a table by a force of 5 N. When the push is increased to 9 N what is:
1. The resultant force
2. The acceleration?

Answer 5

1. When the force is increased to 9 N, the resultant force is (9-5) N = 4 N.
2. F=MA, if substituted, A=F/M
   A=4/2 = 2 m/s^2

Question 6

Define Newtons Second Law in terms of Acceleration

Answer 6

The acceleration of an object is directly propotional to the net force in the same direction and inversely proportional to the Mass of the Object.

Question 7

Define Newtons Third Law

Answer 7

A body A exerts a unit force on object B, then object B exerts and equal but opposite force on object A

Question 8

What does Newtons Third Law of Motion also State?

Answer 8

It States that forces never occur Singly but always in pair ans a result of the action between two bodies.

Question 9

What is the SI Unit of ACCELERATION?

Answer 9

m/s^2 (M-Meters, S-Second)

Question 10

Define One NEWTON

Answer 10

Newton is a Unit of Force.
Newton is equal to the force that would give 1 Kilogram Mass a acceleration of 1 m/s^2.
1 N = 1 KG x 1 m/s^2

Question 11

What is the Unit of Force?

Answer 11

Newton (N)

Question 12

What is the unit and value of Gravity on Earth?

Answer 12

9.8 m/s^2

Question 13

Define Weight.

Answer 13

Weight is defined as the force of gravity acting on in which gives an acceleration when it is falling freely on the earths surface.

Question 14

What is MASS?

Answer 14

Th amount of Matter present in an Object.

Question 15

What is the formula for Weight?

Answer 15

W=M.g (W- Weight, m-Mass, g-Gravity)

Question 16

What is the SI Unit of MASS?

Answer 16

Kilogram (KG)

Question 17

What is the difference between MASS and WEIGHT?

Answer 17

The mass of an object always remains the same irrespective of gravity. Whereas, the weight of an object changes with respect to gravity.

Question 18

What is Terminal Velocity?

Answer 18

The constant velocity a freely falling object falls due to its size, weight and shape.

Question 19

What is the Resultant Force of a Freely Falling Object?

Answer 19

Zero.
The Resultant force of the object is Zero since the Gravitational Force balances the Frictional Force.

Question 20

What is the Difference between a Newton, Joule and Watt?

Answer 20

Newton is the measure of Force.
Joule is the measure of work and energy in the metric system.
Watt is the measure of Power.

Question 21

Define a Joule.

Answer 21

A Joule is at the Work done on an object when a Force of 1 Newton is applied through a Distance of 1 Meter.

Question 22

1 Joule is = ?

Answer 22

1 J = 1 N.m

Question 23

Work formula?

Answer 23

W = f . d

Question 24

How much is 1 Newton in grams?

Answer 24

102 grams