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Physical Science Final

Terms in this set (33)

the speed of an object and specification of its irection and motion is:
velocity
what is the net force produced by a 30-N force if 2 forces act in the opposite direction?
0N
The following is defined as the distance traveled per time:
speed
True or False: When friction is absent, a moving object does not need a force to keep it moving
true
True or False: Only objects at rest can be at equilibrium
false
Mutual action between objects where each object exerts an equal and opposite force on the other is:
interaction
True or False: In every interaction, forces always occur in pairs
true
the quantity of matter in an object is:
mass
True or False: Acceleration is inversely proportional to net force
false
The product of mass of an object and its velocity is:
momentum
which baseball player would get hit with less force from the ball: pitcher, 2nd baseman, or outfielder? Explain your answer
outfielder because as time, time increases the force decreases
What does pi equal? (to the hundereth)
3.14
Which of the following is not a good conductor of heat? Air, Wood, metal, cork
air
Heat must be removed to _________steam back into water or freeze water into ice
condense
What are the four phases of matter?
solid, liquid, gas, plasma
the term applied to material through which light cannot pass:
opaque
Atoms of the same elements that contain different numbers of neutrons called_____.
isotope
Which of the following has the most mass? Hydrogen, Lead, Uranium, Iron
Uranium
What makes an element distinct?
atomic number
the property of a material that resists the flow of charged particles through its is:
electrical resistance
What draws more current. a 50-W bulb and 75-W bulb?
75W
Why do electrons rather than protons make up the flow of charge in a metal wire?
they are free to move while the protons are confined
What do we call the sum of number of protons and neutrons in the nucleus of an atom?
mass number
Work equals:
force x distance
What is the combination of two or more substances in which each substance retains its properties?
mixture
pure water boils at what degree celsius
100 degrees, freezes at 0degrees
An atom is electrically neutral when it has an equal number of:
protons and electron
Any atom has a net electric charge is:
ion
the resistive force that opposes the motion of an object past another object with which it is in contact with is called____.
friction
for every action there is an equal opposed reaction. What is this a statement of?
newton's 3rd law
What is the rate of energy transfer or rate of doing work called?
power
What do you call the product of the force acting on an object and the time over which it acts?
impulse
State Ohm's law
refers to one of the fundamental relationships found in electronic circuits: that, for a given resistance, current is directly proportional to voltage
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