when a man walks on a surface horizontally with constant velocity, work done by a- friction is zero b- constant force is zero c- gravity is zero d- all of these
Answer:Since no relative sliding occurs during walking, static friction comes into play. Hence the point of application of static frictional force does not move. Therefore no work is done by frictional force.
When a man walks on a surface horizontally with constant velocity, the work done by the following forces is:
a) Friction: The work done by friction is indeed zero because the displacement is in the same direction as the force of friction, and the velocity remains constant. In this case, the frictional force does not result in any net displacement, so no work is done.
b) Constant force: If there is a constant force acting horizontally, and the displacement is also horizontal, then the work done by the constant force is zero.
c) Gravity:Gravity acts vertically, perpendicular to the horizontal motion of the man. Since the displacement and the force of gravity are perpendicular to each other, the work done by gravity is also zero.
Answers & Comments
Answer:Since no relative sliding occurs during walking, static friction comes into play. Hence the point of application of static frictional force does not move. Therefore no work is done by frictional force.
Explanation:
Verified answer
Answer:
When a man walks on a surface horizontally with constant velocity, the work done by the following forces is:
a) Friction: The work done by friction is indeed zero because the displacement is in the same direction as the force of friction, and the velocity remains constant. In this case, the frictional force does not result in any net displacement, so no work is done.
b) Constant force: If there is a constant force acting horizontally, and the displacement is also horizontal, then the work done by the constant force is zero.
c) Gravity: Gravity acts vertically, perpendicular to the horizontal motion of the man. Since the displacement and the force of gravity are perpendicular to each other, the work done by gravity is also zero.
Therefore, the correct option is:
d) All of these.