Which of following is correct, when a person walks on a rough surface

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4-2.Friction

easy

Which of the following is correct, when a person walks on a rough surface

The frictional force exerted by the surface keeps him moving

The force which the man exerts on the floor keeps him moving

The reaction of the force which the man exerts on floor keeps him moving

None of the above

(IIT-1981)

Solution

(c) By Newton's third law of motion, the ground exerts back an equal and opposite force along the line of action of the force we exert on the ground. The vertical component of this reaction force balances our weight (so we do not have any motion perpendicular to the ground), and the horizontal component pushes us forward. So we move

Hence $C$ option is correct

Standard 11

Physics

Consider a car moving on a straight road with a speed of $100\, m/s$. The distance at which car can be stopped, is …….. $m$. $[\mu_k = 0.5]$

medium

A small body slips, subject to the force of friction, from point $A$ to point $B$ along two curved surfaces of equal radius, first along route $1,$ then along route $2$. Friction does not depend on the speed and the coefficient of friction on both routes is the same. In which case will the body’s speed at $B$ be greater?

medium

A wooden block of mass $M$ resting on a rough horizontal surface is pulled with a force $F$ at an angle $\phi $ with the horizontal. If $\mu $ is the coefficient of kinetic friction between the block and the surface, then acceleration of the block is

hard

A block is placed on a rough horizontal plane. A time dependent horizontal force $F = kt$ acts on the block, where $k$ is a positive constant. The acceleration – time graph of the block is

medium

(JEE MAIN-2013)

For a given mass rolling friction is how many times static friction and kinetic friction?

medium

Which of the following is correct, when a person walks on a rough surface

Solution

Similar Questions

Consider a car moving on a straight road with a speed of $100\, m/s$. The distance at which car can be stopped, is …….. $m$. $[\mu_k = 0.5]$

A wooden block of mass $M$ resting on a rough horizontal surface is pulled with a force $F$ at an angle $\phi $ with the horizontal. If $\mu $ is the coefficient of kinetic friction between the block and the surface, then acceleration of the block is

A block is placed on a rough horizontal plane. A time dependent horizontal force $F = kt$ acts on the block, where $k$ is a positive constant. The acceleration – time graph of the block is

For a given mass rolling friction is how many times static friction and kinetic friction?

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