Tag: physics

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Questions Related to physics

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

A bullet of mass 40 g moving with a speed of $90 ms^{-1}$ enters a heavy wooden block and is stopped after a distance of 60 cm. The average resistance force exerted by the block on the bullet is

  1. 180 N

  2. 220 N

  3. 270 N

  4. 320 N
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Using the work-energy theorem: Work = Change in Kinetic Energy. F * d = 1/2 * m * v^2. F * 0.6 = 1/2 * 0.04 * (90)^2. F * 0.6 = 0.02 * 8100 = 162. F = 162 / 0.6 = 270 N.

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

Momentum is a measure of 

  1. Weight

  2. Mass

  3. Quantity of motion

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

Momentum is mass* velocity.

For motion two questions are important, " How much is moving? " and "How fast is it moving?'
For change in state, inertia is necessary. Inertia is mass for translational motion. 
So, Quantity of motion is momentum.

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

A long-jumper runs before jumping to 

  1. Cover greater distance

  2. Maintain momentum conservation

  3. Gain energy by running

  4. Gain momentum
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

While running a long distance, jumper tries to gain more velocity that increases his momentum. When he jumps, due this momentum, his body covers longer distance.

So, Option D is correct.

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

If the same force is applied on two bodies of different masses for the same time, then the change produced in the momentum of the two bodies is also same .

  1. True

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

According to Newton's second law,

F = ma = m (v - u)/ t
Ft = mv - mu = Change in momentum
Now, for two bodies, if Ft is same, change in momentum is also same.
So, given statement is true.