Second Law of Motion

Assertion: We should always wear a seat belt while travelling in a car.

Reason: Seat belt prevents us from falling forward due to inertia when sudden brakes are applied.

A man throws a ball weighing $500 \mathrm{g}$ vertically upwards with a speed of $10 \mathrm{m}/\mathrm{s}$. What will be its initial momentum?

A car rolls down a hill with an acceleration of $1.5 \mathrm{m}/{\mathrm{s}}^2$. If the mass of the car is $900 \mathrm{kg}$, calculate the unbalanced force that acts on the car.

What is the mass of a body weighing $98 \mathrm{N}$ on the earth surface?

What is the momentum of a $6.0 \mathrm{kg}$ bowling ball in $\mathrm{kg} \mathrm{m} {\mathrm{s}}^{-1}$ with a velocity of $2.2 \mathrm{m} {\mathrm{s}}^{-1}$?

Linear momentum is defined as the quantity of _____ contained in a body.

Which of the following is the correct relation?

The momentum is the product of mass and _____.

Force is inversely proportional to the acceleration of the body.

The SI unit of weight is _____.

Two balls $\mathrm{A}$ and $\mathrm{B}$ of masses $\mathrm{m}$ and $3\mathrm{m}$ are in motion with velocities $3\mathrm{v}$ and $\mathrm{v}$ respectively. Their momenta are in the ratio

The CGS unit of force is dyne.

Which of the following is the unit of force?

When a body travels at uniform velocity, its momentum changes by _____ $\mathrm{kg} \mathrm{m} {\mathrm{s}}^{-1}$.

In the equation $F=kma$, $k$ will become one for one unit of force. One unit of force is also equal to one _____.

Consider the equation $F=kma$. The unit of force is so chosen that the value of the constant, $k$ becomes _____.

Define one unit of force.

Force is measured in terms of _____.

$1 \mathrm{kg} \mathrm{m} {\mathrm{s}}^{-1}=$ ${10}^k \mathrm{g} \mathrm{cm} {\mathrm{s}}^{-1}$. The value of $k$ is _____.

Force is _____ proportional to change in momentum.