- This is a relationship between two quantities where they increase or decrease at the same rate. In other words, when quantity A changes by a certain factor, quantity B will change by the same factor.
- Motion involves a change in the position of an object over time. Motion influences when objects move and the forces necessary to make them move. Classical mechanics is the branch of physics that studies motion.
- Force is any interaction that, when unopposed, will change the motion of an object. A force can cause an object with mass to change its velocity, i.e., to accelerate. Force can also be described intuitively as a push or a pull. A force has both magnitude and direction, making it a vector quantity.
- The condition of a system when neither its state of motion nor its internal energy state tends to change with time.
- The quantity of motion of a moving body, measured as a product of its mass and velocity.
- The capacity for doing work. It may exist in potential, kinetic, thermal, electrical, chemical, nuclear, or other various forms.
- Work is the product of force and displacement. In physics, a force is said to do work if, when acting, there is a movement of the point of application in the direction of the force.
- A fluid is a substance that continually deforms (flows) under an applied shear stress, or external force.
- A gas is a sample of matter that conforms to the shape of a container in which it is held and acquires a uniform density inside the container, even in the presence of gravity and regardless of the amount of substance in the container.
- Periodic motion is a motion repeated in equal intervals of time.
- Electricity is the presence and flow of electric charge. Using electricity we can transfer energy in ways that allow us to accomplish common chores.
- Magnetism is one aspect of the combined electromagnetic force. It refers to physical phenomena arising from the force caused by magnets, objects that produce fields that attract or repel other objects.
- Described as a disturbance that travels through a medium, transporting energy from one location (its source) to another location without transporting matter.
- Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum.
- Sound is a vibration that typically propagates as an audible wave of pressure, through a transmission medium such as a gas, liquid or solid. In human physiology and psychology, sound is the reception of such waves and their perception by the brain.
- An atom is the smallest constituent unit of ordinary matter that constitutes a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small; typical sizes are around 100 picometers.