Heat & Matter
What are the three common states of matter?
Solid, liquid, gas
What kind of material allows electric current to flow through it easily?
Conductor
This is the force that acts opposite the force of gravity and makes an object feel lighter
Buoyancy
Name 3 examples of wedges.
Knife, scissors, axe, nails, teeth, etc.
Give 3 examples of an object with potential energy. Each example should have more potential energy than the last.
Answers will vary.
Matter will change from one state to another if thermal energy is ______________ or ______________.
Absorbed / released
What is the name for an electrical component that impedes the flow of electric current in a circuit?
Resistor (Insulator)
A substance with a mass of 12g and density of 6g/mL has what volume?
2 mL
How many simple machines are there? Name all of them.
Lever, inclined plane, wedge, screw, pulley, wheel-and-axle.
Give 3 examples of an object with kinetic energy. Each example should have more potential energy than the last.
Answers will vary.
Name the 3 ways heat is transferred.
Conduction, convection, radiation
Name the type of circuit that when one bulb goes out, all the other bulbs in the circuit go out too.
Series
If the buoyant force on an object is less than the object's gravitational force, this will happen?
The object will sink.
What is the term for when effort is multiplied?
Mechanical Advantage
Where does the car have the most kinetic energy? Where does the car have the most potential energy?
3 & 1 (arguably also 4)
Name 4 phase changes. Give details for each state of matter.
Melting: Solid to liquid.
reezing: Liquid to solid.
Evaporation: Liquid to gas.
Condensation: Gas to liquid.
Sublimation: Solid to gas.
Deposition: Gas to solid.
This is a device that is used to open and close a circuit easily without connecting and disconnecting the wires.
Switch
What is the unit of measurement for pressure? What is this unit equal to?
Pa, Pascals = N/m2
What class is a lever if the effort is in the middle?
Class 3
An object with a motional kinetic energy of 1125J has a mass of 250kg. What is its velocity?
v = 3 m/s
What is the temperature at which all matter stops moving?
Absolute zero, 0 Kelvin, -273.15°C
What part of the circuit is providing the resistance? Caclulate the resistance to the nearest hundredth.
2.05 Ω
If a fluid is allowed to move, it will always go from an area of _________ pressure to an area of _________pressure
High pressure to low pressure
Describe which 3 simple machines work together in a common can opener. How does each simple machine function?
Handle - lever
Cutting blade - wedge & wheel-and-axle/gear
Describe how kinetic and potential energy interact when a pendulum swings.
The pendulum has the most potential energy at the top of the swing. This energy is transferred into kinetic energy as the pendulum gains speed.