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Class XI Physics Laws of Motion Quiz 4

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Question 1

A block rests on a rough plane whose inclination θ to the horizontal can be varied. Which of the following graphs indicates how the frictional force F between the block and the plane varies as θ is increases –

Question 2

A stationary body of mass m is slowly lowered onto a massive platform of mass M (M>>m) moving at a speed V₀ = 4 m/s as shown in fig. How far will the body slide along the platform? ( µ = 0.2 and g = 10 m/s²)

Question 3

A ball moving with a velocity u strikes a wall moving towards the ball with a velocity v as shown in the figure. An elastic impact occurs. Then work done by wall during collision is........... Consider the mass of the wall to be infinitely.

Question 4

A smooth sphere of mass m strikes a second sphere of mass 2m which is at rest. After the collision their directions of motion are at right angles. Then coefficient of restitution is-

Question 5

Two blocks A(3kg) and B(6kg) are connected by a spring of stiffness 512 N/m and placed on a smooth horizontal surface. Initially the spring has its equilibrium length. Velocities 1.8m/s and 2.2 m/s are imparted to A and B in opposite direction. The maximum extension in the spring will be –

Question 6

An impulse

changes the velocity of a particle from

. Kinetic energy gained by the particle is –

Question 7

A rod of length l slides down along the inclined wall as shown in figure. At the instant when the speed of end A is v, speed of B is-

Question 8

Two cars having masses m₁ and m₂ move in circles of radius r₁ and r₂. If they complete the circle in equal time. The ratio of their angular speeds ω₁/ω₂ is-

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Oct 9JEE & BITSAT