Tag: physics

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Questions Related to physics

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 dynamics - explaining motion concept of inertia galileo's law and inertia mass and inertia

When a running horse suddenly stops, the rider falls forwards.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

the statement is true and the reason is Newton's law of inertia or First law of motion. 

As body tends to be in its original state when the horse suddenly stops, the lower part of rider stops with it but upper part remains in motion. So, rider falls forward.

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.