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NEET • PHYSICS • LAWS OF MOTION

Laws of motion practice · Medium

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Showing 151-161 of 161 questions

151 Medium

151 of 161

Understanding +4 | -1

In case of uniform circular motion which of the following physical quantity do not remain constant

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Correct option: B

Momentum

Option B is correct because in uniform circular motion, the speed is constant, but the velocity (and therefore momentum) changes direction, meaning momentum is not constant.

152 Medium

152 of 161

Application +4 | -1

Sand is being dropped on a conveyor belt at the rate of M kg/s . The force necessary to keep the belt moving with a constant velocity of V m/s will be [newton]

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Correct option: C

Option C (MV) is correct because the force required is equal to the rate of change of momentum of the sand being dropped onto the belt.

153 Medium

153 of 161

Application +4 | -1

Two balls each of mass 1 kg moving in opposite directions with speed 15 m/s collides and rebounds with the same speed. The magnitude of impulse imparted to each ball due to other is

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Correct option: C

30\,kg\,m\,{s^{ - 1}}

Option C (

30\,kg\,m\,{s^{ - 1}}

) is correct because the impulse is the change in momentum, which is twice the initial momentum since the balls rebound with the same speed.

154 Medium

154 of 161

Application +4 | -1

The momentum of a particle is

\mathrm{\vec P}\,2cos\,\mathrm{t\hat i} + 2\mathrm{sint}\,\mathrm{\hat j}

. What is the angle between the force

\mathrm{\vec F}

acting on the particle and the momentum

\mathrm{\vec P}

View answer and explanation

Correct option: B

\mathrm{9}{\mathrm{0}^0}

Option B (

\mathrm{9}{\mathrm{0}^0}

) is correct because the force is the time derivative of momentum, and in this case, the force and momentum are perpendicular.

155 Medium

155 of 161

Application +4 | -1

A constant force (F) is applied on a stationary particle of mass

'm'

. The velocity attained by the particle in a certain displacement will be proportional to

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Correct option: D

\frac{1}{{\sqrt m }}

Option D (

\frac{1}{{\sqrt m }}

) is correct. Using the equations of motion and Newton's second law, we can relate the velocity to the mass and find that the velocity is inversely proportional to the square root of the mass.

156 Medium

156 of 161

Understanding +4 | -1

A ball hits a vertical wall horizontally at 10 m/s bounces back at 10 m/s

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Correct option: C

There is an acceleration because there is a momentum change

Option C (There is an acceleration because there is a momentum change) is correct because acceleration is defined as the rate of change of velocity, and a change in direction implies a change in velocity, hence a change in momentum.

157 Medium

157 of 161

Application +4 | -1

A 100 kg car is moving with a maximum velocity of 9 m/s across a circular track of radius 30 m. The maximum force of friction between the road and the car is

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Correct option: C

270 N

Option C (270 N) is correct because the maximum force of friction is equal to the centripetal force required for the car to move in a circle.

158 Medium

158 of 161

Application +4 | -1

A body sliding on a smooth inclined plane required 4s to reach the bottom, starting from rest at the top. How much time does it takes to cover one-fourth the distance starting from rest at top?

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Correct option: B

Option B (2s) is correct because the time taken is proportional to the square root of the distance covered in uniformly accelerated motion.

159 Medium

159 of 161

Analyzing +4 | -1

Statement-I: When a person walks on a rough surface, the frictional force exerted by surface on the person is opposite to the direction of his motion.
Statement-II: It is the force exerted by the road on the person that causes the motion.

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Correct option: C

Statement-I is false and statement-II is true

Option C is correct because the frictional force exerted by the surface on the person is in the direction of motion, and the force exerted by the road causes the motion.

160 Medium

160 of 161

Remembering +4 | -1

A force produces an acceleration of 1 m/s in a body of mass 1 kg. This form is defined as?

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Correct option: A

Newton

Option A is correct. A Newton is defined as the force required to accelerate a 1 kg mass at 1 m/s².

161 Medium

161 of 161

Application +4 | -1

A mass of 1 kg is suspended by a thread. It is lifted up with an acceleration of

4.9\mathrm{ }m/{s^{ - 2}}

and then lowered with an acceleration of

4.9\mathrm{ }m/{s^{ - 2}}

. The ratio of tensions in first case to second cases is

\left( {g = 9.8\mathrm{ }m{s^{ - 2}}} \right)

View answer and explanation

Correct option: C

3\mathrm{ }:\mathrm{ }1

Option C (

3\mathrm{ }:\mathrm{ }1

) is correct because the tension is greater when lifting up with acceleration than when lowering with the same acceleration.

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