Observation 1: Try to stop a ball coming towards you,so as to save a boundary, by applying a force of some magnitude in the opposite direction of the motion of the ball.

Observation 2: In the same case, you apply the force of same magnitude but in same direction of the motion of the ball.

Observation 3: In the same case, you apply the force in the opposite direction of the motion of the ball but its magnitude is less.

In which case/cases will you be able to stop the boundary. Why is that?

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Solution

Only in the first case boundary will be saved. The rest two cases will fail to save the boundary.

In the second observation, there is a change in direction of force. The applied force being in the same direction as that of the motion of the ball, will make the ball move towards the boundary with even more speed.

Whereas in the third observation, force of less magnitude in the opposite direction is being applied, so it will be a case of unbalanced forces. The force applied will not be enough to stop the ball.
Hence, we will not be able to save the boundary.

So, either a change in direction or magnitude of a force causes a change in its effect.

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Similar questions

Observation 1: Try to stop a ball coming towards you,so as to save a boundary, by applying a force of some magnitude in the opposite direction of the motion of ball.

Observation 2: In the same case, you apply the force of same magnitude but in same direction of the motion of the ball.

Observation 3: In the same case, you apply the force in the opposite direction of the motion of the ball but its magnitude is less.

In which case/cases you will stop the boundary. Why is that? [3 MARKS]

Observation 1: Try to stop a ball coming towards you,so as to save a boundary, by applying a force of some magnitude in the opposite direction of the motion of ball.

Observation 2: In this case apply the force of same magnitude but in same direction of the motion of the ball.

In observation 1 boy saves a boundary by applying a force opposite to the direction of motion but in observation 2, the change in direction of force cost the team 4 runs as the change in direction of force pushed the ball further to the boundary.

So, the change in effect of a force can be experienced by a change in it's direction as well as magnitude. The above statement is :-

Man A takes 5 seconds to stop a 1 kg ball thrown at 10 m/s at him. Man B takes the same time to return the same ball coming at him at 5 m/s exactly in the opposite direction with same speed. Who applied more force?

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.

Neha is pushing a box having wheels with a force of 40N. Prashant joins in and starts pushing the box with a force of same magnitude and in the same direction.

a) What will be the net force on the box? What will be the direction of motion of object with respect to the applied force?

b) which type of force will be exerted on the wheels while the box is pushed?

c) What will happen to the motion of the box if Prashant exerts force of lesser magnitude and in the direction opposite to that of Neha?

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