# Physics Terms 2

## Terms

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- Acceleration due to gravity
- The acceleration produced in a body due to the earth's attraction is called acceleration due to gravity. It is denoted by the letter g. Its SI unit is m/s². On the surface of the earth, its average value is 9.8m/s².
- Acceleration
- The rate of change of velocity of a moving object
- Amp[Ampere]
- Unit of electric current. It is equivalent to coulomb/sec.
- Amplitude [of waves]
- The maximum displacement of particles of the medium from their mean positions during the propagation of a wave
- Angle of incidence
- Angle of an incident (arriving) ray or particle to a surface; measured from a line perpendicular to the surface (the normal)
- Angle of reflection
- Angle of a reflected ray or particle from a surface; measured from a line perpendicular to the surface (the normal)
- Avogadro's Number
- 6.02 x 10^23
- Centripetal force
- The force required to pull an object out of its natural straight-line path and into a circular path
- Coulomb
- Unit used to measure quantity of electric charge
- Diffraction
- The bending of light around the edge of an opaque object
- Doppler effect
- An apparent shift in the frequency of sound or light due to relative motion between the source of the sound or light and the observer
- First law of motion
- Every object remains at rest or in a state of uniform straight-line motion unless acted on by an unbalanced force
- Frequency (of waves)
- The number of waves produced per second is called its frequency.[Hz]
- Index of refraction
- The ratio of the speed of light in a vacuum to the speed of light in a material
- Inertia
- The property of matter that causes it to resist any change in its state of rest or of uniform motion.
- Joule
- Metric unit used to measure work and energy; can also be used to measure heat; equivalent to newton-meter
- Net force
- The resulting force after all vector forces have been added; if a net force is zero, all the forces have canceled each other and there is not an unbalanced force
- Newton
- A unit of force defined as kg.m/sec^2
- Newton's second law of motion
- The rate of change of momentum is equal to the force applied OR the force acting on a body is directly proportional to the product of its mass and acceleration produced by the force in the body.
- Newton's third law of motion
- To every action there is an equal and opposite reaction
- Ohm
- Unit of resistance; equivalent to volts/amps
- Power
- The rate of doing work is called power. Power is a scalar quantity. The SI unit of power is Watt ( 1 W = 1 J/sec)
- Refraction
- A change in the direction of travel of light, sound, or other waves crossing a boundary
- Scalar Quantity
- is described completely by its magnitude
- Volt
- Unit of potential difference equivalent to joules/coulomb
- Watt
- Metric unit for power; equivalent to joule/sec
- Work
- Work is done when a force acting on a body displaces it. Work is a scalar quantity. The SI unit for work is Joule