Tag: inertia and mass

Questions Related to inertia and mass

State whether given statement is True or False.
An object experiences a net zero external unbalanced force. Is it possible for the object to be travelling with a non-zero velocity?

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

  1. True

  2. False

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Correct Option: B
Explanation:

Yes, when external unbalanced force on an object is zero, the object can travel with a non-zero velocity. Such a motion will be a uniform motion. The conditions for this are:
(i) Magnitude of velocity must be constant.
(ii) Direction of velocity must be constant i.e., it travels in a straight line without change in direction.

The inertia of a moving body makes it:

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

  1. stop due to friction

  2. increase its speed

  3. decrease its speed

  4. resist a change in its state of motion

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Correct Option: D
Explanation:

Inertia is a physical property that offers resistance to change in the state of motion of an object i.e an object tends to remain in its initial state of motion when no external force is applied to it.

The inertial force acts in a 

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

  1. Opposite direction to that of acceleration force

  2. Same direction as that of accelerating force

  3. Perpendicular direction to that accelerating force

  4. None of the above

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Correct Option: A
Explanation:

The concept of Inertial force is mainly used as a pseudo force in case of accelerating frames of reference.

The inertial force hence will act in a direction opposite to the direction of acceleration of the frame of reference.

The mass of object A is 5 kg,that of object B is 40 kg,that of object C is 38 kg,and that of object D is 56 kg. Which object has the greatest inertia?

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

  1. A

  2. B

  3. C

  4. D

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Correct Option: D
Explanation:

The object having the greatest mass has the greatest inertia because more force is required to change the initial state of the object.

Thus object D has the greatest inertia.

Inertia of a body has direct dependence on:

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

  1. velocity

  2. mass

  3. area

  4. volume

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Correct Option: B
Explanation:

Inertia has direct dependence on mass.

Inertia depends solely on mass and more the inertia more will be the mass or vice versa.

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

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

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Correct Option: B
Explanation:

Mass of body is translation inertia. So, more mass means more inertia. (heavier body difficult to move)

So, option B is correct.

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

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

  1. P has more inertia than Q

  2. Q has more inertia than P

  3. P and Q have the same inertia

  4. Neither P nor Q has any inertia

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Correct Option: B
Explanation:

Mass is a translation inertia of body.

More mass means more inertia.
So, $ Q$ has more inertia than $P$.
Option B is correct.

Passengers standing in a bus are thrown outwards when the bus takes a sudden turn, Because of:

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

  1. Outward pull on them

  2. Inertia

  3. Change in momentum

  4. Change in acceleration

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Correct Option: B
Explanation:

It’s because of inertia, which is simply the tendency of any body to continue on whatever path it’s travelling unless acted on by an external force. For a standing passenger, his/her body will tend to continue along the straight line route the bus was travelling before the sharp turn. As the passenger’s feet are fairly firmly located to the floor of the bus when it turns, a force will act upon the passenger’s feet accelerating them towards the centre of the turn. 

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

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

Mass is the count of inertia. 

More is the mass, more is the inertia 

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

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

  1. $P$ has more inertia than $Q$

  2. $Q$ has more 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 is the quality in matter (matter is anything you can touch) that lets it stay still if it is still, or keeps it moving if it is moving.

Since Q has more mass it has more inertia than P.