Tag: force and newton's laws of motion

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Questions Related to force and newton's laws of motion

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

While dusting a carpet, we give a sudden jerk or beat with a stick because :

  1. Inertia of rest keeps the dust in its position and the dust is removed by movement of carpet away.

  2. Inertia of motion removes dust.

  3. No inertia involved in process.

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When carpet is given sudden jerk, due to inertia dust particles does not change position, while carpet moves.

Thus dust particles gets separated from carpet.
So, Option A is correct. 

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

Which of the following has more inertia ___

  1. 5Rp coin and 2Rp coin

  2. 2Rp coin and 3Rp coin

  3. 10Kg iron

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Inertia depends upon the mass of the body. If the mass is more, inertia is more and vice versa. 10kg iron has more mass than 5Rp coin and 2 Rp coin thus its inertia is also more.
So, the correct answer is '10kg iron'.
Multiple choice physics force and newton's laws of motion concept of inertia galileo's law and inertia mass and inertia

A water tanker filled up to $\dfrac {2}{3}$rd of its height is moving with a uniform speed. On sudden application of the brake, the water in the tank would

  1. move backward

  2. move forward

  3. be unaffected

  4. rise upwards
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Basically, the law of motion is that an object at rest stays at rest and an object continues in motion until an external force acts on it.
Inertia is the resistance of any physical object to any change in its state of motion, including changes to its speed and direction. It is the tendency of objects to keep moving in a straight line at constant velocity.


So, on sudden application of brakes on the water tank, the water tank decelerates or may even stop but the water in the tank still has a tendency to move forward due to inertia. Hence the water in the tank would move forward.
A water tanker filled up to two-thirds of its height moving with a uniform speed, on sudden application of the brake, the water in the tank would move forward.

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

If a train is retarding and at same time coin is thrown upwards, then you will observe that:

  1. the coin reaches again in your hand

  2. the coin falls behind you

  3. the coin falls in front of you

  4. the coin follows a circular path
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

At t$=$0
Velocity of train$=$v
Velocity of coin$=$v(horizontal velocity in the direction of velocity of train)
at t$=$t
Velocity of train$=$v-$\Delta$ v
Velocity of coin$=$v
Distance travelled by train after retarding$=$(v-$\Delta$v)t
Distance travelled by coin$=$v$\times$t   which is greater than distance travelled by train.
So,the coin will fall infront of you.


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

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

  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.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

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

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

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

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
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. 

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

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

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  1. Because of inertia of rest

  2. Because of inertia of motion

  3. Because of inertia of direction

  4. Because of momentum
Reveal answer Fill a bubble to check yourself
A Correct answer
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.