Newton's laws (Forces) Quiz 1

Question 1

If two different bodies of different masses $${{m}_{1}}$$ and $${{m}_{2}}$$ $$\left( {{m}_{2}} > {{m}_{1}} \right)$$ are being applied with same force then what will be the ratio between their accelerations?

Accepted Answer

$$\dfrac{{{a}_{1}}}{{{a}_{2}}} > 1$$

Answer

$$\dfrac{{{a}_{2}}}{{{a}_{1}}} > 1$$

Answer

$$\dfrac{{{a}_{1}}}{{{a}_{2}}}=1$$

Answer

$$\dfrac{{{a}_{1}}}{{{a}_{2}}}\le 1$$

Question 2

The derivation of Newton’s third law is using the concept of,

Accepted Answer

Rate of change of momentum

Answer

Inertia

Answer

Conservation of mass

Answer

None of these

Question 3

The magnitude of distance travelled with respect to time by a body of mass $$5\,kg$$ is found to be $$\left( 9{{t}^{2}}+6t+4 \right)\,m$$. What is the value of the impulse of the force exerted in a time interval of $$\Delta t=\dfrac{1}{10}\,s$$?

Accepted Answer

$$9\,kgm{{s}^{-1}}$$

Answer

$$900\,kgm{{s}^{-1}}$$

Answer

$$90\,kgm{{s}^{-1}}$$

Answer

$$18\,kgm{{s}^{-1}}$$

Question 4

The toy car having a mass $$1\,kg$$ was given a force in the forward direction with a magnitude $$(10t	ext{+1 })N$$. A kid pushed it backward with a force $$8t\,N$$. What will be the resultant velocity of the car?

Accepted Answer

$$t\left( t+1 \right)$$

Answer

$${{t}^{2}}$$

Answer

$$2{{t}^{2}}+1$$

Answer

$$2{{t}^{2}}+t$$

Question 5

The momentum of a body travelling in the x-axis is found to be having magnitude as $${{t}^{2}}$$. The magnitude of acceleration of the body has been measured as $$5t$$. Calculate the mass of the body.

Accepted Answer

$$\dfrac{2}{5}\,kg$$

Answer

$$10{{t}^{2}}\,kg$$

Answer

$$10\,kg$$

Answer

$$\dfrac{t}{5}\,kg$$