Vocabulary - 1
What occurs when an object sticks to itself?
Cohesion
What force holds back the movement of an object?
friction
What is gravity?
The force that pulls objects toward the center of the earth
Name three lubricants discussed in class
water, oil, soap
What are the three states of matter?
Solid, liquid, and gas
What type of friction slows an object moving through air or water?
drag
What is the maximum speed an object reaches when being pulled towards the earth by gravity called?
terminal velocity
What is the difference between adhesion and cohesion?
Adhesion is when an object sticks to something else and cohesion is when an object sticks to itself
If a bowling ball and a basketball are pushed for the same height, at the same time, which of the balls will hit the ground first?
They would hit the ground at the same time because they will reach terminal velocity
What do you call the energy levels where electrons orbit an atom?
electron shells or obitals
What type of shape makes an object move easier through air or water?
aerodynamic
What is it called when an object sticks to something else?
adhesion
What is drag?
friction that slows an object as it moves forward through the air or in water.
Name one experiment from Lesson 7 and what you learned from it
(answers may vary)
What is a molecule made of repeating molecules called?
polymer
What is friction between two objects that keeps them from sliding across each other?
traction
What is a substance that reduces friction called?
What is friction?
The force that holds back the movement of an object
How do ballerinas use friction?
They need friction to control movement and spins otherwise they would fall
What is a mixture of different metals called?
alloy
What law states that the closer objects are to one another, the more powerful the attraction between them will be?
law of universal gravitation
What is force that acts on a body moving in circular path and is directed toward the center around which the body is moving?
centripetal force
What is terminal velocity?
The maximim speed reached when an object is being pulled by gravity
How do football players use friction?
Which scientist discovered the laws of motion and gravity?
Sir Isaac Newton