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 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.

The momentum is the product of mass and _____.

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.

Newton-second is the SI unit of _____. (work/ impulse)

Momentum changes in the same direction as _____ of the object.

A ball of mass $4.5 \mathrm{kg}$ is accelerated at a rate of $10 \mathrm{m} {\mathrm{s}}^{-2}$. Calculate the force applied on the ball.

A car is moving with a velocity of $10 \mathrm{cm} {\mathrm{s}}^{-1}$ having a momentum $35 \mathrm{kg} \mathrm{m} {\mathrm{s}}^{-1}$. Calculate the mass of the car.

Why does a bowler run some distance before bowling?

Two balls of same size but unequal masses are moving with same velocity. Which one will have more momentum?

Define momentum. Give its SI unit.

Represent graphically: Momentum vs mass when velocity is constant.

Represent graphically: Momentum vs velocity when mass is fixed.

Identify the following as vector and scalar quantities, momentum, mass.