Physics

• The SI unit for work is joule (J)
• Work is the transfer of energy that occurs when a force is applied to an object and causes it to move in the direction of the force.
• Work is done in two ways: either by a constant force or by a variable force.
• When a constant force is applied, it is parallel to the object's direction of displacement, resulting in positive work.
• The equation for work when force and displacement are parallel to each other is W = Fs.
• When a variable force is not applied along the object's direction of displacement, it results in negative work.
• The equation for work when F and s are not parallel is W = Fscosθ.
• Work is not done if an object does not move when force is exerted (or not exerted).
• Work can be positive if force or its components doing work is in the same direction as the displacement or aids motion.
• Work can be negative if the force is against the object's direction of displacement or impedes motion.
• 746 watts is equal to one horsepower.
• The SI unit for power is watt (W), which is equal to joule per second.
• Power is also the ability to do work.
• Power is the quantity that describes the RATE at which a given amount of work is completed.
• Chemical energy results from chemical reactions between atoms or molecules.
• Electromagnetic energy is energy from light or EM waves.
• Nuclear energy is the energy resulting from changes in the atomic nuclei or from nuclear reactions.
• Gravitational energy is energy that involves the attraction between two objects based on their mass.
• Mechanical energy is the sum of kinetic and potential energy, resulting from the movement or location of an object.
• Thermal/heat energy reflects the temperature difference between two systems.
• Types of energy include mechanical, thermal, nuclear, chemical, EM, sonic, gravitational, kinetic, potential, and ionization.
• Horsepower (hp) is used to refer to a machine’s output.
• Energy is the ability to exert force on another object to do work.
• To express how fast work is done, power is used.
• 1 joule is equal to 1 newton x 1 meter
• The equation for power is p = work/time or F/velocity.
• - rotational

  energy generated by rotational motion.
• - translational

  energy generated by translational motion.
• Ability to do work is known as energy.
• Energy can neither be created nor destroyed, it can be transferred to another object or converted to another form.
• When potential energy is converted to kinetic energy, it creates positive work and vice versa.
• The amount of energy stays the same.
• Types of energy include mechanical, thermal, nuclear, chemical, electromagnetic, sonic, gravitational, kinetic, potential, and ionization.
• Nuclear energy is the energy resulting from changes in the atomic nuclei or from nuclear reactions.
• Chemical energy results from chemical reactions between atoms or molecules.
• Electromagnetic energy is energy from light or EM waves.
• Gravitational energy is the energy that involves the attraction between two objects based on their mass and can serve as a basis for mechanical energy, such as the potential energy of an object placed on a shelf or the kinetic energy of the Moon in orbit around the Earth.
• Ionization energy is the energy that binds electrons to the nucleus of its atom, ion, or molecule.
• Potential energy is the energy of an object's position, represented by the SI unit: joule, and there are two kinds of potential energy: gravitational and elastic.
• Gravitational potential energy is the potential energy stored as a result of the Earth's gravitational attraction on the object and is represented by the equation: PEgrav = mgh.