In the figure shown a block of weight 10 N is resting on a horizontal surface (figure). The coefficient of static friction between the block and surface is force of 3.5 N will keep the block in uniform motion, once it has been set in motion. A horizontal force of 3 N is applied to the block then:
- First it will move with a constant velocity for some time and then will have accelerated motion
- the block move having accelerated motion over the surface
- The block move over the surface with a constant velocity
- The block will not move
The Correct Option is D
Solution and Explanation
Since, the force of 3.5 N will keep the block in uniform motion it means no net force will act on the body as the applied force of 3.5 N is just sufficient to overcome the force of friction. If the force applied is less than 3.5 N the block will not move. Hence, when 3N is applied, block will not move.
So, the correct option is (D): The block will not move.
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Concepts Used:
Laws of Motion
The laws of motion, which are the keystone of classical mechanics, are three statements that defined the relationships between the forces acting on a body and its motion. They were first disclosed by English physicist and mathematician Isaac Newton.
Newton’s First Law of Motion
Newton’s 1st law states that a body at rest or uniform motion will continue to be at rest or uniform motion until and unless a net external force acts on it.
Newton’s Second Law of Motion
Newton's 2nd law of motion deals with the relation between force and acceleration. According to the second law of motion, the acceleration of an object as built by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.
Newton’s Third Law of Motion
Newton's 3rd law of motion states when a body applies a force on another body that there is an equal and opposite reaction for every action.