Good day learners
Did you know that where you are sitting now, you have potential energy and if you get up and walk to the kitchen for a glass of water, you have kinetic energy?
Even the cup in the cupboard above kettle has potential energy. How so you may ask yourself, if it is only an object?
While the answer is in the information below. Don't forget to watch the video as well for a better understanding.
Have fun on the rollercoaster below.
1. WHAT IS POTENTIAL ENERGY?
The energy an object has due it’s position (height) above the Earth’s surface relative to a reference point.
1.1 Potential energy is proportional to the mass of an object.
𝑃𝐸 ∝ 𝑚𝑎𝑠𝑠
Therefor, the greater the mass, the greater the potential energy.
1.2 Potential energy is also proportional to the height of an object.
𝑃𝐸 ∝ h𝑒𝑖𝑔h𝑡
Therefor, the greater the height, the greater the potential energy.
The formula used to calculate potential energy is as follows:
EP = m g h where;
m = mass (kg)
g = (gravitational acceleration 9,8 m.s-2)
h = height (meters)
2. What is kinetic energy?
The energy an object has/stores due to its motion.
Kinetic energy is proportional to the mass of an object.
KE ∝ m
The greater the mass of an object, the greater the greater the kinetic energy.
Kinetic energy is proportional to the velocity of an object.
The faster the motion, the greater the kinetic energy.
The formula for Kinetic energy:
Watch the video below to distinguish between potential and kinetic energy.