If force is acting on a moving body perpendicular to the direction of motion, then what will be its effect on the speed and direction of the body ?

Calculate them impulse necessary to step 1500 kg car  travelling at 90 km/h.

Why is static friction called a self-adjusting force?

A body is moving in a circular path such that its speed always remains constant. Should there be a force action on the body?

The mountain road is generally made winding upwards rather than going straight up. Why?

The outer rail of a curved railway track is generally raised over the inner. Why?

A passenger of mass 72.2 kg is riding in an elevator while standing on a platform scale. What does the scale read when the elevator cab is 
(i) descending with constant velocity
(ii) ascending with constant acceleration, 3.5 m/s²?

Why does a child feel more pain when she falls down on a hard cament floor, than when she falls on the soft muddy ground in the garden ?

A body of mass 25 kg is moving with a constant velocity of 5 m /s on a horizontal frictionless surface in vacuum. What is the force acting on the body ?

A body of mass 10 kg is placed on an inclined plane of angle 30\(^0\) . If the coefficient of static friction is \(\frac { 1 }{ \sqrt { 3 } } \) . Find the force required to just push the body up the inclined surface.

A block of mass 2 kg is placed on the floor. The coefficient of limiting friction is 0.4 . If a force of 3.6 N is applied on the block parallel to the floor. Find the acceleration of the block. What is the force of friction between the block and floor ?

An artificial satellite of mass 2500 kg is orbiting around the earth with a speed of 4 kms^-1 at a distance of 10^-4 from the earth. Calculate the centripetal force action on it.