E.1 Energy Forms and Transfers

Practice Worksheet — name: ______________________ date: ____________

Formulas for this topic

Kinetic Energy

E_k = \frac{1}{2}mv^2

Gravitational Potential Energy

E_p = mgh

Section A — Multiple choice

A1. Which of the following is a form of stored (potential) energy?

A Light energy
B Sound energy
C Chemical energy
D Kinetic energy

A2. An object of mass 2 kg is raised to a height of 5 meters. What is its gravitational potential energy? (Take g = 9.8 m/s²)

A $10\, J$
B $49\, J$
C $98\, J$
D $196\, J$

Section B — Short answer

B1. State the Law of Conservation of Energy.

B2. Explain the energy transformations that occur when a pendulum swings from its highest point to its lowest point.

Answer key

For worked explanations, interactive practice and more free resources, visit www.newtonine.com

Section A

A1: Chemical energy

A2: $98\, J$

Section B

B1: Energy cannot be created or destroyed, only transferred from one form to another.

B2: At its highest point, the pendulum has maximum gravitational potential energy and zero kinetic energy. As it swings down, GPE is converted into kinetic energy. At the lowest point, it has maximum kinetic energy and minimum potential energy.