. Flashcards
What is Kinetic Energy (KE)?
Kinetic Energy is the energy an object has due to its motion. The formula to calculate it is KE = 1/2 * mass * velocity².
What is Gravitational Potential Energy (PE)?
Gravitational Potential Energy is the energy stored in an object due to its height above the ground. The formula to calculate it is PE = mass * gravitational acceleration (9.8 m/s²) * height.
How do you calculate Kinetic Energy (KE)?
The formula for Kinetic Energy is KE = 1/2 * mass * velocity². You need to know the mass of the object and its velocity (speed).
How do you calculate Gravitational Potential Energy (PE)?
The formula for Gravitational Potential Energy is PE = mass * gravitational acceleration (9.8 m/s²) * height. You need to know the object’s mass, the height, and use the constant 9.8 m/s² for gravitational acceleration.
If an object is stationary, what type of energy does it have?
A stationary object has potential energy (if it’s at height) or no energy (if it’s on the ground with no height). It has no kinetic energy.
If an object is moving, what type of energy does it have?
A moving object has kinetic energy because of its motion.
What happens to Potential Energy (PE) as an object falls?
As an object falls, its gravitational potential energy is converted into kinetic energy.
What is Elastic Potential Energy?
Elastic Potential Energy is the energy stored in an object when it is stretched or compressed, like a spring or rubber band.
What is Chemical Potential Energy?
Chemical Potential Energy is the energy stored in the chemical bonds of substances. It is released during chemical reactions, like when food is digested or when fuel is burned.
What is Magnetic Potential Energy?
Magnetic Potential Energy is the energy stored in a magnetic field, such as the energy between two magnets that are either attracting or repelling each other.
How does Energy Conservation relate to a roller coaster?
On a roller coaster, energy is conserved. At the highest point, the roller coaster has maximum potential energy, and as it moves down, potential energy is converted to kinetic energy (motion). At the lowest point, the roller coaster has maximum kinetic energy and minimum potential energy.
What is the Law of Conservation of Energy?
The Law of Conservation of Energy states that energy cannot be created or destroyed, only transferred or transformed from one type to another (e.g., from PE to KE).
If an object has a mass of 2 kg and a velocity of 5 m/s, what is its kinetic energy?
Using the formula KE = 1/2 * mass * velocity², we calculate: KE = 1/2 * 2 * (5)² = 1/2 * 2 * 25 = 25 J. The kinetic energy is 25 joules.
If an object has a weight of 50 N and is placed at a height of 10 meters, what is its gravitational potential energy?
Using the formula PE = weight * height, we calculate: PE = 50 N * 10 m = 500 J. The gravitational potential energy is 500 joules.
What are the units of energy?
The unit of energy is the joule (J). For example, kinetic energy and potential energy are both measured in joules.
