Choose the correct option, If all of the forces acting on a block balance so that the net force is zero.

the block speed will decrease

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the block must be at rest

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the block direction of motion can change, but its speed cannot

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the block will follow a parabolic trajectory

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None of the above

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Solution

The correct option is E None of the above
If all the forces acting on a block balance each other, it means that net acceleration of the block in any direction is zero. Thus the speed of the block remains the same.
Option A is incorrect since the speed does not change.
Option B is incorrect since the block may continue to move with some finite speed.
Option C is incorrect since any change in direction would mean change in velocity, which would mean acceleration of the block which cannot occur.
Option D is incorrect since the block will tend to follow a linear path.

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Similar questions

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In the above figure, the arrows indicate the direction of forces $F_{1}$ and $F_{2}$ and the magnitudes of the respective force are given above the arrows.

Towards which direction will the block move?

Q. A

3 kg

block of wood is on a very large level surface where

μ_{s} = 0.25

and

μ_{k} = 0.2

. A force of

7 N

is being applied horizontally to the block. Mark the correct statement(s) regarding this situation.

Q. Multiple correct answers type
A 3-kg block of wood is on a level surface where

μ_{s} = 0.25

and

μ_{k} = 0.2

. A force of 7 N is being applied horizontally to the block. Mark the correct statement(s) regarding this situation.
a. If the block is initially at rest, it will remain at rest and friction force will be about 7 N.
b. If the block is initially moving, then it will continue its motion forever if the force applied is in the direction of the motion of the block.
c. If the block is initially moving and the direction of applied force is same as that of motion of block, then block moves with an acceleration of

1 / 3 m s^{- 2}

along its initial direction of motion.
d. If the block is initially moving and direction of applied force is opposite to that of initial motion of the block, then the block decelerates, comes to a stop, and starts moving in the opposite direction.

A horizontal force of $10 N$ is acting on the block which doesn't change its motion. Static friction acting on the block is ___newtons.

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