## Glossary of Physics Terms 2

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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