# Newton’s Laws of Motion and Friction - Objective questions answers | Test series with solutions

Physics objective questions answers, MCQ Test Series with solutions for NEET, AIPMT, IIT JEE, other Medical and Engineering Entrance Exams; Admission Tests.

### Physics Objective Questions with Solutions | Newton’s Laws of Motion and Friction (Syllabus)

Force and Inertia; Law of Inertia; Newton’s First Law of Motion; Center of Mass; Momentum; Newton’s Second Law of Motion; Impulse; Newton’s Third Law of Motion; Law of Conservation of Linear Momentum and its applications; Variable Mass; Free Body Diagrams; Pulleys; Equilibrium of Concurrent Forces; Constraint Equations; Pseudo Force; Static and Kinetic Friction; Laws of Friction; Rolling Friction; Centripetal Force and its applications; Impulse; Collision
Newton’s Laws of Motion and Friction
Solved Multiple Choice Questions Test Series (MCQ) – Set 3 (Q. No 21-30)

Question 21: Two weights W1 and W2 are suspended from the ends of a light string passing over a smooth fixed pulley. If the pulley is pulled up at an acceleration g. The tension in the string will be:

Question 22: A body of mass 3 kg hits a wall at an angle of 600 and with speed of 10 m/s and returns at the same angle. The impact time is 0.2 sec. Calculate force exerted on the wall:

a. 150√3 N
b. 100 N
c. 50√3 N
d. 75√3 N

Question 23: Ten coins each of mass 10 gm are placed one above the other. The reaction force exerted by 7th coin from the bottom on the 8th coin is –
a. 0.3 N
b. 0.2 N
c. 0.4 N
d. 0.7 N

Question 24: Consider the situation shown in fig. The wall is smooth but the surface of A and B in contact are rough. The friction on B due to A in equilibrium –
a. Is upward
b. Is downward
c. Is zero
d. The system cannot remain in equilibrium

Question 25: A particle moves in the xy plane under the action of a force F such that the value of its linear momentum (P) at any time t is, Px = 2 cos t, Py = 2 sin t. The angle θ between P and F at that time t will be:
a. 00
b. 300
c. 900
d. 1800

Question 26: A rocket of mass 6000 kg is set for vertical firing. If the exhaust speed is 1000m/sec. The rate of mass of gas ejected to supply a thrust needed to give the rocket an initial upward acceleration of 20.2 m/s2 is –
a. 150 kg/sec
b. 160 kg/sec
c. 28 kg/sec
d. 180 kg/sec

Question 27: If the coefficient of friction of a surface is √3, then the angle of inclination of the plane to make a body on it just to slide, is –
a. 300
b. 450
c. 600
d. 7500

Question 28: In the shown in the figure, the pulley has a mass 3m. Neglecting friction on the contact surface, the force exerted by the supporting rope AB on the ceiling is:
a. 6 mg
b. 3 mg
c. 4 mg
d. None of the above

Question 29: Two bodies of masses 4 kg and 16 kg at rest to act upon by same force. The ratio of times required to attain the same speed is –
a. 1: 1
b. 4: 1
c. 1: 4
d. 1: 2

Question 30: Two masses A and B 0f 10 kg and 5 kg respectively are connected with a string passing over a frictionless pulley fixed at the corner of a table as shown in the figure. The coefficient of friction of A with the table is 0.2. The minimum mass of C that may be placed on A to prevent it from moving is equal to:
a. 15 kg
b. 10 kg
c. 5 kg
d. 20 kg

Newton's Laws of Motion, Friction - More Practice Questions