Question

A truck moves at a steady speed on a horizontal road. What is the work done by the road on the truck?

Answer 1

Work and energy are inextricably linked. According to the work–energy principle, an increase in the kinetic energy of a rigid body is generated by an equivalent amount of positive work done on the body by the force acting on it. A reduction in kinetic energy is generated by the resulting force doing an equivalent amount of negative work. As a result, if the net work is positive, the particle's kinetic energy increases by the same amount. If the total work done is negative, the particle's kinetic energy is reduced by the same amount.

Complete step-by-step solution:
Work is the energy delivered to or from an item by applying force along a displacement in physics. It is frequently expressed as the product of force and displacement in its simplest form. When applied, a force is said to produce positive work if it has a component in the direction of the point of application's displacement. If a force has a component that is opposite the direction of displacement at the point of application, it produces negative work.
The work is 0 because, while the vehicle moves over time, the road's force (the normal force) is perpendicular, and therefore the dot product of the two is zero. When force and displacement are perpendicular to one another and when force or displacement is zero, zero work is defined.
When we hold an object and walk, the force works in a downward direction. When displacement operates in a forward direction, the force acts in a downward direction.
If you push a wall and it doesn't move, you haven't accomplished anything.
Sleeping for numerous hours is another example of not working.

Note: Because the cosine of 90 degree is zero, no work is done when a force component is perpendicular to the displacement of the object (such as when a body travels in a circular route under a central force). As a result, gravity cannot perform any work on a planet in a circular orbit (this is ideal, as all orbits are slightly elliptical). Also, no work is done on a body travelling circularly at a constant speed when restricted by mechanical force, such as a frictionless ideal centrifuge running at constant speed.