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63 Cards in this Set
- Front
- Back
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What is a path that allows only one route for an electric current called?
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series circuit
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What is a circuit that has two or more branches for electrons to follow?
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parallel circuit
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What is the material through which electrons do NOT easily flow?
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conductor
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If the leaves of an electroscope spread apart, it indicates what?
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the leaves of the electroscope have received a charge
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What is the correct equation to show the relationship among power, current, and voltage?
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P = I x V
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What is the correct equation to calculate electrical energy?
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E = P x t
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What is a slanted surface used to raise an object called?
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inclined plane
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What is a bar that is free to pivot about a fixed point called?
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lever
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What is the machine called that has a inclined plane with one or two sloping sides?
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wedge
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What is a inclined plane that wraps around a cylindrical post?
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screw
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What is it called when two or more simple machines work together?
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compound machine
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What is an arrangement of pulleys designed to reduce the effort of force called?
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block and tackle
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What also increases when the kinetic energy of an object increases?
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velocity
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What happens to an objects potential energy when you increase the objects speed?
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no affect
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What is the equation used to calculate kinetic energy?
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KE (J) = 1/2m(kg) x v2(m2/s2)
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What is the equation used to calculate gravitational potential energy?
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GPE(J) = m(kg) x 9.8m/s2xh(m)
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According to the law of conservation of energy, what does the total amount of energy in the universe do?
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remains constant
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What is the upward force of an object falling through the air called?
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air resistance
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What is used to explain the relationship among mass, force and acceleration?
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Newton's second law of motion
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A feather will fall through the air more slowly than a brick due to what?
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air resistance
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In the absence of air, a penny and a feather that are dropped from the same height at the same time will do what?
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fall at the same rate
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What is the acceleration due to gravity?
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9.8m/s2
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What is the equation according to Newton's second law of motion?
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F = m x a
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When an object to moves in a circular path, what causes it to accelerates toward the center of the circle?
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centripetal force
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What is the path of a projectile?
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curved
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What does the size of a gravitational force of two objects depend on?
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the mass and distance between them
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What does the p represent in the equation p = m x v
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momentum
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What is the acceleration of an 25-kg object if the force is 300-N?
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12 m/s2
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What is the acceleration of an 200-kg object if the force is 3,000-N?
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15 m/s2
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Motion is a change in what?
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position
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What is the speed you read on your speedometer called?
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instantaneous speed
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What is the equation for the relationship among speed, distance and time?
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s = d/t
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What is the rate of change for acceleration?
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velocity
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What is your acceleration if your ride your bike up a hill, then ride down the other side?
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first negative, then positive
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What is the equation used to find acceleration?
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Vf - Vi/t
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What do inertia varies depend on?
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mass
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Newton's first law of motion is also called the law of?
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inertia
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What is a measurement standard defined as?
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the exact quantity people agree to use for comparison
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What is the SI unit that is used to measure time called?
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second
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What is the best type of graph used to show how some fixed quantity is broken down into parts?
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circle graph
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What is one benefit of the SI system?
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it is based on multiples of ten
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What is the process of gathering information through senses called?
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observation
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What is the first step in designing an experiment?
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state the problem
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What is a standard for comparison called that helps to ensure that the experimental result is caused by the conditon being tested?
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control
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What is a factor that does NOT change in an experiment called?
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constant
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What does the Cp represent in the heat formula?
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specific heat
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What does the Q represent in the heat formula?
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heat gained or lost
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What does the delta T in the heat formula stand for?
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change in temperature
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Work output of a machine divided by the work input
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efficiency
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Ratio of resistance force to effort force
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mechanical advantage
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Device that does work with only one movement
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simple machine
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The force you apply to a simple machine
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effort force
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Device made up of more than one simple machine
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compound machine
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Energy that is transferred by electromagnetic waves
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radiation
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The transfer of energy by direct contact of particles
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conduction
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The transfer of energy by particles in motion or currents
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convection
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Thermal energy that flows from a higher temperature to a lower temperature
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heat
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The amount of heat needed to raise the temperature of 1 kg of a material by 1 degree C
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specific heat
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The average kinetic energy of an object's atoms or molecules
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temperature
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A material that does not allow heat to flow through it easily
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insulator
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An engine that converts thermal energy into mechanical energy
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heat engine
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True or False
Winds are examples of convection currents |
True
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True or False
Heat is a measure of the average kinetic energy of all the particles in an object |
False
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