PHYSICS CLASS TEST WEEK Flashcards
Speed
A measure of how fast something is moving. It can be found using distance/time.
Average Speed
A type of speed that you can find by dividing the total distance by the total time taken.
Scalar
A quantity that are fully described by a magnitude alone. Some examples are:
- Distance
- Speed
- Time
- Power
- Energy
Vector
A quantity that are fully described by a magnitude and direction. Some examples are:
- Displacement
- Velocity
- Acceleration
- Force
- Weight
- Momentum
Acceleration
The increase of speed, it can be found using Change of speed or velocity/The Time taken
Deceleration
The decrease of speed, it can be found using Starting speed - Final Speed/The time taken
Light
Electromagnetic radiation within the portion of the electromagnetic spectrum that can be perceived by the human eye.
Transparent Object
An object that lets all light pass through them.
Translucent Object
An object that lets some light pass through them.
Opaque Object
An object that doesn’t let any light pass through them.
Shadow
The darkness formed when an object blocks the light. It’s formed by an opaque/translucent object blocking the light falling on it.
Characteristics of Light
- It travels in a straight line.
- It’s both a wave and a particle.
- Light travels in really fast speeds.
Characteristics of a Shadow
- It is always black, regardless of the color of the
object. - It only shows the outline of an object, not the details.
- The size of a shadow depends on the distance
between the object and the source of light, and the
distance between the object and the screen.
Characteristics of an Image
- Follows the color of the object.
- Shows the details of the object, not only the outline.
- Undergoes lateral vision.
Luminous Objects
Objects that can emit light energy by themselves.
Non-Luminous Objects
Objects that cannot emit light energy by themselves.
Reflection
Reflection is a change in direction of a wave upon
striking the interface between two materials. The law of reflection is Angle of Reflected Ray = Angle of Incident Ray
Reflective Objects vs Non-reflective Objects
Reflective: Have a smooth, shiny surface and pale, Give clear image because they reflect light regularly.
Non Reflective: Have rough and usually dark colors,
Give diffused image because they reflect irregularly.
Refraction
Bending of Light. It effects in making objects look bent in water and in air.
Dispersion
Refraction of different colors by
different amounts.
