Which of the following statements is correct? 1) force is a relative quantity and not an absolute quantity that is its direction and magnitude can change from observer to observer. 2) force can either be relative or absolute depending on the context. 3) frictional force is a relative force that is its direction depends on the observer. 4)the magnitude and direction of force depends on the frame of reference of the observer and changes with change in frame of reference.

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Q. Two trolleys 1 and 2 are moving with accelerations

a_{1}

and

a_{2}

, respectively, in the same direction. A block of mass m on trolley 1 is in equilibrium from the frame of observer stationary with respect to trolley

2

. The magnitude of friction force on block due to trolley is (assume that no horizontal force other than friction force is acting on block).

Q. Choose the correct option.
i. There is nothing like "Absolute rest" or "Absolute motion".
ii. Frame of reference is attached with observer.
iii. Time does not depends on the frame of reference.
iv. To know the complete information about any event, there is no requirement of observer.

Q. Which of the following statements are true?
i. There is nothing like "Absolute rest" or "Absolute motion".
ii. Frame of reference is attached with observer.
iii. Time does not depend on the frame of reference.
iv. To know the complete information about any event, there is no requirement of observer.

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 this case apply the force of the same magnitude but in the same direction of the motion of the ball.

In observation 1, the 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 the effect of a force can be experienced by a change in its direction as well as magnitude. The above statement is:-

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 :-

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