Tag: force and newton's laws of motion

Quizzes (10) Questions (223)

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

A hammer weighing $3  kg$, moving with a velocity of $10  {m}/{s}$, strikes against the head of a spike and drives it into a block of wood. If the hammer comes to rest in $0.025  s$, the impulse associated with the hammer will be

  1. $30 N s$

  2. $-30 N s$

  3. $15 N s$

  4. $-15 N s$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let J be the impulse associated with the hammer

then, $\dfrac{\Delta J}{\Delta t} = ma$ and a =$\dfrac{\Delta V}{\Delta t}$

Hence, j = m$\Delta V$

j= 3(0 - 10) Ns = -30 Ns

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

Momentum has the same units as that of 

  1. Impulse

  2. Torque

  3. Moment of momentum

  4. Couple
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Impulse applied to an object produces an equivalent vector change in its linear momentum, also in the same direction. The SI unit of impulse is the newton second $(N⋅s)$, and the dimensionally equivalent unit of momentum is the kilogram meter per second $(kg⋅m/s).$