Tag: physics

Questions Related to physics

A football has lesser inertia than a stone of the same size because:

physics force and newton's laws of motion concept of inertia galileo's law and inertia mass and inertia

  1. Football has more air inside than the stone.

  2. Football has less air inside than the stone.

  3. Football has less mass than the stone.

  4. Football has more mass than the stone.

Show answer
Correct Option: C
Explanation:

Inertia is the property of mass. Mass of stone $>$ mass of football.

When a tree with a flexible stem is shaken vigorously,its fruits and leaves fall  own.This phenomenon can be explained by making use of

physics force and newton's laws of motion concept of inertia galileo's law and inertia mass and inertia

  1. Newton's first law of motion

  2. Newton's second law of motion

  3. Newton's third law of motion

  4. Law of conservation of momentum

Show answer
Correct Option: A
Explanation:

 

There are three types of inertia:
1. Inertia of rest: This is the resistance offered by the body to remain in rest unless an external force is not applied on the body. Eg. : If a carpet is beaten with a stick then the dust particles due to inertia of rest tends to remain in rest while the fibres of carpet becomes in motion.


2. Inertia of direction: This is the resistance offered by the body to change its direction unless an ext. force is not applied on the body. Eg : If a bus takes a turn then passengers sitting in tends to remain in the same direction in which the bus was travelling before.


3. Inertia of motion: The resistance offered by the body to change its uniform motion. Eg : If a bus stops suddenly then the passengers fall forward due to inertia of motion

So when we shake a tree, due to inertia of motion the fruit tries to remain in motion. Due to which it gets detached from the branch and falls.

A and B are two objects with mass 6 kg and 34 kg respectively. Then

physics force and newton's laws of motion concept of inertia galileo's law and inertia mass and inertia

  1. A has more inertia than B

  2. B has more inertia than A

  3. A and B both have same inertia

  4. none of the above is true

Show answer
Correct Option: B
Explanation:

Inertia has direct dependence on $mass$. More is the mass of the body, more is the inertia.

Since, B has more mass, thus B has more inertia than A. 

P and Q are two objects with masses 5 kg and 30 kg respectively. Then

physics force and newton's laws of motion concept of inertia galileo's law and inertia mass and inertia

  1. P has more inertia than Q

  2. Q has move inertia than P

  3. P and Q have the same inertia

  4. neither P nor Q has any inertia

Show answer
Correct Option: B
Explanation:

Inertia has direct dependence on $mass$ of the body. More the mass of the body, more will be its inertia.

Since Q has more mass, thus Q has more inertia than P.

Why can dust be removed from a carpet by shaking it, or by beating it with a stick?

physics force and newton's laws of motion concept of inertia galileo's law and inertia mass and inertia

  1. Because of inertia of rest

  2. Because of inertia of motion

  3. Because of inertia of direction

  4. Because of momentum

Show answer
Correct Option: A
Explanation:

When the carpet is shaken or beaten by a stick, then the carpet moves back but the dust remains still due to inertia of rest and hence the dust particles get separated out.

Which will have move inertia?

physics force and newton's laws of motion concept of inertia galileo's law and inertia mass and inertia

  1. A plastic eraser

  2. Pencil

  3. A book

  4. A table

Show answer
Correct Option: D
Explanation:

The object having the greatest mass has the greatest inertia.

As the the table is the heaviest object among the given options, thus table will have more inertia.

Why athletes stop themselves before the line marked for javelin throw

physics force and newton's laws of motion concept of inertia galileo's law and inertia mass and inertia

  1. Due to inertia of rest

  2. Due to inertia of motion

  3. Due to inertia of direction

  4. All

Show answer
Correct Option: B
Explanation:

Due to inertia of motion, an object do not stop all of a sudden rather it continues to move over some distance. Hence the athletes stop themselves much before line marked so that they come to rest before crossing that line, otherwise it is said to be a foul.

The sparks produced during sharpening of a knife against a grinding wheel leaves the rim of the wheel tangentially. This is due to which of the following?

physics force and newton's laws of motion concept of inertia galileo's law and inertia mass and inertia

  1. Inertia of rest

  2. Inertia of motion

  3. Inertia of direction

  4. Force applied

Show answer
Correct Option: C
Explanation:

Just after the sparks are produced, the force acting on the sparks becomes zero and due to inertia of direction, they start to move in their initial direction of motion which is tangential to the rim of the grinding wheel.

When a bus starts suddenly, the person falls backwards because of

physics force and newton's laws of motion concept of inertia galileo's law and inertia mass and inertia

  1. Inertia of rest of the passenger

  2. Inertia of motion of the passenger

  3. Inertia of rest of the bus

  4. None of the above

Show answer
Correct Option: A
Explanation:

When a bus starts suddenly,the person falls backwards because of inertia of rest of passenger.This is due to the fact that because of their inertia ,the passengers tend to remain in their state of rest when the bus starts suddenly.

Which of the following statement is true when a magician pulls a tablecloth from under a table full of dishes without disturbing the dishes?

physics force and newton's laws of motion concept of inertia galileo's law and inertia mass and inertia

  1. Gravity holds the dishes still

  2. The weight of the dishes is reduced

  3. Action-reaction forces are in operation

  4. The dishes have inertia

  5. The dishes have no acceleration

Show answer
Correct Option: D
Explanation:

The dishes have the inertia at rest, thus they tend to remain at rest even when the tablecloth is pulled of suddenly from the table and hence the dishes do not get disturbed.