Energy and Work

1. Energy

2. Types of energy

3. Kinetic

3.1. KE=0.5*m*v^2

3.2. energy that a body possesses by virtue of being in motion

4. Potential

4.1. PE(grav)=mass*g*height

4.2. the energy possessed by a body by virtue of its position relative to others, stresses within itself, electric charge, and other factors

5. Gravitational Energy

5.1. Gravitational potential energy is RELATIVE

5.2. PE(grav)=mass*g*height

5.3. a pen being held above a table has a higher gravitational potential than a pen sitting on the table

5.4. Gravitational energy is the potential energy held by an object because of its high position compared to a lower position

6. Thermal Energy

6.1. Particles of a gas accelerating, creating heat.

6.2. Measured in joules

6.3. Can be generated by friction

7. Conservation of Energy

7.1. The energy of a system is constant

7.2. Energy cannot be created nor destroyed

7.3. Energy can only change form

7.4. True for any system with no external forces

8. Spring Force

8.1. PEspring=1/2*k*x^2

8.2. Hooke's Law

8.2.1. Spring force = spring constant x displacement

8.2.2. F=kx

9. Conservation of Mechanical Energy

9.1. E_t=KE+PE

10. Work

10.1. In physics, a force is said to do work if, when acting, there is a displacement of the point of application in the direction of the force.

10.2. W= F*d (cosΘ)

10.3. Measured in joules

11. Power

11.1. Power is the rate at which work is done

11.2. P=W/T (or) P=F/V

12. Work-Energy theorem

12.1. The net work done on an object equals to the change in the object’s kinetic energy