Motion and it’s types | Newton’s law of motion

Motion and it’s types | Newton’s law of motion

Definition of Motion:-

Motion :- Change in position of an object with respect to time is called motion. Generally it is classified into to types – Linear motion and non linear motion.

1. Linear Motion:- In this type of motion body travels along a straight line.
2. Non-linear Motion:– In this type of motion body travels along the non-straight line.

Further classification of motion on the basis of uniformity:-

1. Uniform motion :- In this type of motion velocity of body does not change with respect to time.
2. Non-uniform motion:- In this velocity changes with respect to time.

Velocity: It is displacement per unit time. Velocity = Displacement / Time Unit of velocity: m/s

Acceleration: It is the rate of change of velocity. Acceleration = Velocity / Time Unit of acceleration: m/s2 Note– Negative acceleration is called retardation or deceleration.

Newton’s laws of motion:-

Newton’s First law of motion:

In the universe, every body that is in rest or in uniform motion will be unchanged until or unless applied an external force. It gives the qualitative definition of force.

Examples of Newton’s first law of motion:

• a moving car stops only when brakes are applied.
• When a train starts suddenly, the passengers receive a backward jerk.
• If a horse suddenly starts galloping, the rider receives a backward jerk.
• An apple falls down from the tree when its branch is shaken.
• When a rotating fan is switched off it continues to rotate.

Newton’s Second law of motion:

it is defined as the rate of change of momentum is directly proportional to the applied force and the change takes place in the direction of the applied force. It gives the quantitative definition of force. It is written as

Force = rate of change of momentum F = ma Units of force: SI unit is Newton. CGS unit is Dyne.

Newton’s Third law of motion:-

This law states that every action has an equal and opposite reaction.

Examples of Newton’s third law of motion:

• An automobile moves forward because of the force exerted on it by the ground which is the reaction to the force exerted on the ground by the tyres.
• The upward thrust of a rocket.
• Hitting off a ball by a bat.
• When you run on a carpet, it moves backward.
• Pushing someone or pushing something we tend to move backward.
• The recoil of a gun.

Frequently Asked Questions:

 

1. Newton’s first law of motion is also known as:

A) Law of inertia
B) Law of force
C) Action-reaction law
D) None of these

ANSWER= (A) Law of inertia
Explain:-
Check Answer

 

2. When a bus starts suddenly, the passengers are pushed back. this is an example of:

A) Newton’s second law
B) Newton’s first law
C) Newton’s third law
D) none of these

ANSWER= (B) Newton’s first law
Explain:-
Check Answer

 

3. Newton’s second law of motion states that

A) Every action has an equal and opposite reaction
B) Force is equal to the product of mass and velocity
C) Force is equal to the product of mass and acceleration
D) None of these

ANSWER= (C) Force is equal to the product of mass and acceleration
Explain:-
Check Answer

 

4. Which among the following is an application of Newton’s third law of motion?

A) Bouncing of ball
B) Rowing a boat
C) A man walking on the ground
D) All of the above

ANSWER= (D) All of the above
Explain:-
Check Answer

 

5. Who is the first person to define speed?

A) Galileo
B) Newton
C) Kepler
D) Ptolemy

ANSWER= (A) Galileo
Explain:-
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6. In a uniform circular motion:

A) Velocity is constant
B) Distance is constant
C) Speed is constant
D) None of these

ANSWER= (C) Speed is constant
Explain:-
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7. Dirt can be removed from a carpet by shaking it vigorously for some time in a process that is based on:

A) First law of motion
B) Second law of motion
C) third law of motion
D) all law applicable

ANSWER= (A) First law of motion
Explain:-
Check Answer

 

8. Newton’s second law of motion is:

A) Law of gravitation
B) Law of inertia
C) Law of acceleration
D) none of these

ANSWER= (C) Law of acceleration
Explain:-
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9. The rate of change of momentum is equal to________.

A) work
B) pressure
C) impulse
D) Applied force

ANSWER= (D) Applied force
Explain:-
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10. Swimming is is an example of:

A) First law of motion
B) Second law of motion
C) Third law of motion
D) Newton’s law of gravitation

ANSWER= (C) Third law of motion
Explain:-
Check Answer

Read Also-

• Fundamental quantities and its units
• Force, its types and its units
• Surface Tension and it’s applications
• Explanations of elasticity and Hooke’s law
• Heat transfer and Modes of heat transfer

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Motion and it’s types