work, energy, machines and conservation
what is work?
what is when a force is applied through a displacement.
In lighting what does the letter E stand for?
Illumination, Lux
what is period?
the time needed for an object to repeat one complete cycle of motion.
Type of mirror found in a bathroom...
what is plane?
What is the charge of the electron
negative
what is one joule (J) equivalent to?
what is 1 joule = 1 N x m
what is opaque?
Objects that absorb and reflect light but do not transmit it
what is the formula to Hooke's law?
F=-kx
what is a concave mirror?
A concave mirror, or converging mirror, has a reflecting surface that is recessed inward (away from the incident light).
What is the location of the electron?
the free floating negatively charged electron cloud
name 3 types of simple machines
what is pulley, lever , wheel and axle , inclined plane, wedge or screw.
True or false
Light travels in a straight line
True
what is a wave?
wave is a disturbance that carries energy through matter or space without transferring motion.
According to the law of reflection the angle of incidence is ____________ the angle of reflection.
equal to
Where is the proton located?
In the very dense nucleus
what is energy?
ability of a system to produce a change in itself or world around it
what is the speed of light?
The speed of light is 300.000 km/s
what is a crest and trough?
crest is the highest point in a wave, while trough is the low point in a wave
Refraction is when light__________.
Changes speed as it travels in different materials which causes bending.
A balloon has a negative charge. A glass rod has a positive charge. What will happen when the rod is brought near the balloon?
the balloon will be attracted to the rod
what is kinetic and potential energy?
what is Energy stored in an object due to its position is Potential Energy. Energy that a moving object has due to its motion is Kinetic Energy.
define luminous and illuminated sources with examples of luminous resource.
luminous are objects that emit their own light like sunlight
illuminated resources are those that you see due to reflecting light
what is the speed of sound in the medium (seawater)
1535 m/s
When will total internal reflection occur?
When the angle of incidence is greater than the critical angle
give examples of 3 conductors and 3 insulators
insulators : wood, glass and plastic
conductors : silver, copper and gold.