Laws of Motion ...

Fig. shows two blocks A and B pushed against the wall with the force F. The wall is smooth but the surfaces in contact of A and B are rough. Which of the following is true for the system of blocks to be at rest against the wall ?

A cart of mass M has a block of mass m attached to it as shown in fig. The coefficient of friction between the block and the cart is μ. What is the minimum acceleration of the cart so that the block m does not fall ?

A block is kept on a frictionless inclined surface with angle of inclination ‘α’. The incline is given an acceleration ‘α’ to keep the block stationary. Then a is equal to

Two blocks of masses m₁ = 5 Kg and m₂ = 6 kg are connected by a light string passing over a light frictionless pulley as shown in fig. If the angle of incline is 300 . What is the magnitude and direction of the force of friction on the 5 Kg block (take g = 10 m/s²) which is at rest on the incline

A block of mass m rests on a rough horizontal surface as shown in Fig. Coefficient of friction between the block and the surface is μ. A force F = mg acting at angle θ with the vertical side of the block pulls it. In which of the following cases can the block be pulled along the surface ?

A block is dragged on a smooth plane with the help of a rope. Which moves with a velocity v as shown in Fig. The horizontal velocity of block is

The velocity of a body of mass 20 kg decreases from 20ms^–1 to 5ms^–1 in a distance of 100 m. Force on the body is

A ball of mass 0.2 kg is thrown vertically upwards by applying a force by hand. If the hand moves 0.2 m while applying the force and the ball goes upto 2 m height further, find the magnitude of the force. (Consider g = 10 ms^–2)

Formula for true force is