# Relationship between work and mechanical energy

### Energy and Work | Protocol

Work and Energy Conservation. Mechanical energy describes the ability of an object to do work. The work done on an object arises from a force applied over a . Source: Ketron Mitchell-Wynne, PhD, Asantha Cooray, PhD, Department of Physics &. The increase in the mechanical energy of the shot equals only the increase in According to the relation between work and energy the velocity is maximized by.

Thus, you arwe doing work against inertia you are doing work against inertia, such that the work equals the change in kinetic energy of the object. When you are doing work against continuous resistive forces, such as gravity or spring tension, work done equals the change in potential energy of the object. Questions you may have include: What is the equation for work? How is work the change in kinetic energy?

## Mechanical Energy

When is work the change in potential energy? This lesson will answer those questions. Units Conversion Equation for work The definition of mechanical work as opposed to thermodynamic work is that it equals a force against some resistance times the distance traveled while that force is being applied.

Unfortunately, many Physics textbooks carelessly omit the idea that there is the resistive force force of inertia, as well as other possible resistances. The equation for work is: The increase in the mechanical energy of the shot equals only the increase in its kinetic energy, because we decided to neglect its potential energy In order to maximize kinetic energy of human body or sport equipment we must exert the greatest possible force along the longest possible distance.

This way we can make us of the knowledge of the relation between energy and work to improve our technique in certain sports, especially in athletics. According to the relation between work and energy the velocity is maximized by the greatest possible force acting along the longest possible distance.

### Mechanical energy - Wikipedia

Shot-putters therefore often start their throw by standing on one foot, bent forward over the edge of the shot-put circle, with their back towards the direction of the throw, to maximize the distance along which their force will act on the shot and thus to also maximize the initial velocity of the shot at the moment of the throw Fig. The longer distance along which the force acts on the shot and the ability to use larger muscle groups thus leads to longer throws and better results.

Figure 13 Initial phases of shot put allowing to maximize the work performed during the throw. This happens mostly in catching projectiles, landing, etc.

- Relationship between Work and Mechanical Energy
- Mechanical energy

Human muscles also perform negative work when our body lands on the ground. During landing it is important to maximize the distance along which the projectile is decelerating. By making stopping distance longer we make impact forces smaller.

We must realize, however, that prolonging the stopping distance by bending our knees deeply, for example, does not necessary lead to smaller reaction forces in specific joints.

To decrease impact forces and increase stopping distance we also use various materials: This law can be used in studying the motion of projectiles. This kinetic energy is transformed into deformation energy of the pole and subsequently into the increase in potential energy of the athlete.

## Energy and Work

In other words, the faster the pole vaulter runs and the better his pole is able to transform kinetic energy into potential energy through deformation energy, the higher he jumps. Part of energy is of course transformed in other types of energy, for example internal energy of the pole, resulting in heat.

In mechanics such ability is described by the quantity called power Mathematically this can be expressed as: