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physical science

final exam

buoyancy the ability to float
relative density determines whether one substance will sink or float in another substance.
convex lens brings images in foces makes objects larger
concave spreads the light before it enters the eye
light light travels through matter as compression waves
sound caused by vibrations or the back and forth movement of matter
current the flow of electricity through a conductor
medium a substance through which energy or waves travle
air resistance a force that opposes the mostion through the air
energy is light .we use light to see, we can see light energy, sunlight is free during the day, we make our own light at night,electricity is light, flashlights use stored electricity.
luster property used to decribe how an object shines in the light.
work what occurs when forces move an object over a distance
friction the force that resists motion when 2 surfaces rub against each other.
force a push or pull that causes an object to move,stop, or change direction.
accelerates in the opposite direction.
Created by: HaileyLacie