Chapter 4&5. Forces+ Work, Energy, Power

Question 1

How to find work done by variable force?

Answer 1

Area under force-displacement graph.

Use integration

Question 2

Formula

1. Work done by constant force and definition
2. KE
3. GPE
4. EPE

Answer 2

1. Work (J) = Fs , product of magnitude of the force “F” and the displacement “s” in the direction of the force
2. (1/2)mv^2
3. mgh
4. (1/2)kx^2

Question 3

Principle of Conservation of Energy

Answer 3

Energy can be converted from one form to another but cannot be created or destroyed

Question 4

Relationship between Power, Force and Velocity

Answer 4

P = Fv

Question 5

Why are there cases when work done is zero even though there is a net force?

Answer 5

When force is perpendicular to displacement

Question 6

How to find probability density function?

Answer 6

|φ|^2

probability of finding the particle at a point