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 momentum (p) introduction to momentum linear momentum

Calculate the momentum of a bullet of $25\ g$ when it is fired from a gun with a velocity of $100\ m/s$:

  1. $20\ kg\ m/s$

  2. $2500\ kg\ m/s$

  3. $2.5\ kg\ m/s$

  4. None
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Given :    $m =25$ g $= 0.025$ kg                   $v =100$ m/s

Thus momentum of the bullet         $P = mv = 0.025\times 100 =2.5$  $kg$ $m/s$

Multiple choice physics force and newton's laws of motion momentum (p) introduction to momentum linear momentum

When a bullet is fired from a rifle its momentum become $20\ kg\ m/s$. If the velocity of the bullet is $1000\ m/s$ what will be its mass?

  1. $30\ g$

  2. $5\ kg$

  3. $20\ g$

  4. $500\ g$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Given :    $P = 20$  $kg$ $m/s$                    $v = 1000$  $m/s$

$\therefore$ Mass of bullet       $m = \dfrac{P}{v} = \dfrac{20}{1000} = 0.02$ kg  $ = 20$ g

Multiple choice physics force and newton's laws of motion momentum (p) introduction to momentum linear momentum

A car having mass of $1000\ kg$ is moving with a velocity of $0.5\ m/s$. What will be its momentum?

  1. $400\ kg\ m/s$

  2. $200\ kg\ m/s$

  3. $500\ kg\ m/s$

  4. $0.05\ kg\ m/s$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Given :    $m = 1000$ kg                   $v =0.5$ m/s

$\therefore$  Momentum of the car         $P = mv = 1000\times 0.5 =500$  $kg$ $m/s$

Multiple choice physics force and newton's laws of motion momentum (p) introduction to momentum linear momentum

A stone attains a momentum of $1\ kg\ m/s$ when it flies with a velocity of $2\ m/s$, then what will be the mass of the stone?

  1. $500\ g$

  2. $2\ kg$

  3. $2\ g$

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

Given :    $P = 1$ $kg$ $m/s$                  $v =2$ m/s

Momentum of the stone        $P = mv$
$\therefore$  Mass of stone     $m = \dfrac{P}{v} =\dfrac{1}{2} = 0.5$ kg  $=500$ g

Multiple choice physics force and newton's laws of motion momentum (p) introduction to momentum linear momentum

The mass of a goods lorry is $4000\ kg$ and the mass of goods loaded on it is $20000\ kg$. If the lorry is moving with a velocity of $2\ m/s$ what will be its momentum?

  1. $48000\ kg\ m/s$

  2. $48\ kg\ m/s$

  3. $4.8\ kg\ m/s$

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

Given :    $m _1 = 4000$ kg           $m _2  =20000$ kg             $v =2$ m/s

Total mass of the 'lorry + goods' system      $M = 4000+20000 =24000$ kg
$\therefore$ Total momentum of the system        $P = Mv = 24000\times 2 =48000$  $kg$ $m/s$

Multiple choice physics force and newton's laws of motion momentum (p) introduction to momentum linear momentum

What does the principle of conservation of linear momentum state?

  1. The linear momentum of a system cannot be changed.

  2. The linear momentum of a system cannot remain constant.

  3. The linear momentum of a system can be changed only if internal forces act.

  4. The linear momentum of a system can be changed only if external forces acts on it.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The principle of conservation of linear momentum states that the linear momentum of a system can be changed only if external forces acts on it.

Multiple choice physics force and newton's laws of motion momentum (p) introduction to momentum linear momentum

Which of the following balls is easier to catch even though all of them are moving with the same velocity?

  1. Tennis ball

  2. Cricket ball

  3. Basket ball

  4. Both cricket and basket ball
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Tennis ball is lighter in weight as compare to cricket ball and thus has momentum much less than the momentum of cricket ball and basket ball ( momentum is equal to mass × velocity)
body that has large momentum possesses large impact as well thus cricket ball,basket ball having more momentum than tennis ball even if they move with same velocities causes more impact on the hands of person that tends to catch it and might sometimes get hurt thus it is easy to catch a tennis ball because its momentum is less  so is its impact
Multiple choice physics force and newton's laws of motion momentum (p) introduction to momentum linear momentum

A force acts on a body of mass 3 kg such that its velocity changes from 4 m $s^{-1}$ to 10 m $s^{-1}$.Calculate the change in the momentum of the body.

  1. 2 kg m $s^{-1}$

  2. 14 kg m $s^{-1}$

  3. 18 kg m $s^{-1}$

  4. 42 kg m $s^{-1}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A force acts on a body of mass 3 kg such that its velocity changes from 4 m/s to 10 m/s

change in momentum 
$\Delta p=m(v _1-v _2)=3*(10-4)=18kg m/s$