physics t6 Flashcards
What occurs when a force is exerted on an object?
Work occurs when a force is exerted on an object, causing it to move.
What is energy?
Energy is the ability to do work.
What is the relationship between work and energy?
The transfer or change in energy is equivalent to the amount of work done on an object.
In what unit are work and energy measured?
Joules (J)
What is the formula for work in terms of energy?
W = ΔE
What is the formula for calculating work done on an object?
W = Ef - Ei
List the types of energy.
- Chemical energy
- Electrical energy & magnetism
- Nuclear & solar energy
- Kinetic energy
- Potential energy
- Heat/Thermal energy
What is mechanical energy?
The sum of kinetic and potential energy possessed by an object.
What is kinetic energy?
Kinetic energy is the energy an object possesses due to its motion.
What factors determine the amount of kinetic energy an object has?
Mass and speed of the object.
Fill in the blank: Kinetic energy is influenced by _______ and _______.
[mass], [speed]
What is potential energy?
Potential energy is energy that has been stored in some way.
List the four general types of potential energy.
- Elastic potential energy
- Chemical potential energy
- Nuclear potential energy
- Gravitational potential energy
What is gravitational potential energy?
The energy an object has when held at a position above the ground.
What influences gravitational potential energy?
The force of gravity and the mass of the object.
What is the acceleration due to gravity on Earth?
9.81 m/s²
What is the formula for calculating mechanical energy?
Em = Ek + Ep
What happens to kinetic energy as gravitational potential energy increases?
Kinetic energy decreases.
What happens to gravitational potential energy as kinetic energy increases?
Gravitational potential energy decreases.
What does the Law of Conservation of Energy state?
The total amount of energy possessed by an object remains constant.
What is an implication of the Law of Conservation of Energy?
Energy cannot be created or destroyed.
True or False: Mechanical energy is the combined total of kinetic and potential energy.
True
Fill in the blank: The total mechanical energy of an object is constant unless _______.
[external work is done on the object]
