NCERT Physics Class 11 Exemplar Ch 5 Laws Of Motion Part 2

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Q.8. A body with mass 5 kg is acted upon by a force If its initial velocity at the time at which it will just have a velocity along the y-axis is

(a) never

(b) 10 s

(c) 2 s

(d) 15 s

Answer: b

Q.9. A car of mass starts from rest and acquires a velocity along east in two seconds. Assuming the car moves with uniform acceleration, the force exerted on the car is

(a) eastward and is exerted by the car engine.

(b) eastward and is due to the friction on the tyres exerted by the road.

(c) more than eastward exerted due to the engine and overcomes the friction of the road.

(d) exerted by the engine.

Answer: b

One and More then Answer

Q.10. The motion of a particle of mass m is given by r . Which of the following statements is true?

(a) The force at on the particle is

(b) The particle is acted upon by on impulse of magnitude

(c) The particle is not acted upon by any force.

(d) The particle is not acted upon by a constant force.

(e) There is no impulse acting on the particle.

Answer: (a), (b) and (d)

Q. 11. In Fig. the co-efficient of friction between the floor and the body The co-efficient of friction between the bodies B and A is 0.2. A force F is applied as shown on B. The mass of and of B is m. Which of the following statements are true?

Contact friction

Contact Friction

Contact friction

(a) The bodies will move together if

(b) The body A will slip with respect to B if

(c) The bodies will move together if

(d) The bodies will be at rest if

(e) The maximum value of F for which the two bodies will move together is

Answer: (a), (b), (d), (e)

Q. 12. Mass moves on a slope making an angle with the horizontal and is attached to mass by a string passing over a frictionless pulley as shown in Figure. The co-efficient of friction between and the sloping surface is

Which of the following statements are true?

Mass on ramp and pulley

Mass on Ramp and Pulley

Mass on ramp and pulley

(a) If , the body will move up the plane.

(b) If body will move up the plane.

(c) If body will move up the plane.

(d) If ), the body will move down the plane.

Answer: (b), (d)

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