In which direction should force be applied, in order to stop a trolley moving downward on the frictionless staircase?

Along the direction of motion

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Opposite to the direction of motion

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Normal upward to the direction of motion

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Normal downward to the direction of motion

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Solution

The correct option is B
Opposite to the direction of motion

Force should be applied in the direction which is opposite to the direction of motion, in order to stop it. If you apply a force along the direction of motion, the trolley will further move down and will not stop. When we apply a normal force, we are not providing any restriction to the trolley along its motion and since the staircase is frictionless, the trolley will not stop and slip off the surface of staircase.

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Q. If a body is moving with a constant speed along a straight line; then in order to change its direction of motion, an external force has to be applied in a direction normal to the direction of motion.

In which direction should a boy apply the force, in order to stop a trolley sliding downward on a slope?

State whether true or false.

If a body is moving with a constant speed along a straight line, then in order to change its direction of motion, an external force or its component has to act in a direction normal to the direction of motion.

If the force is applied in the direction opposite to the direction of motion, then it results in a decrease in the speed of the object in the same direction of motion.

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