Forces and Motion
Define force
Force in an action that has the ability to change motion by a push or pull.
Define battery
A battery uses chemical energy to move charges
Define resistors
Resistors are used to control current in many circuits
Define density
Density is a property that describes the relationship between mass and volume
Define chemical equation
A use of chemical formulas and symbols to represent a reaction instead of using word
Define mass
Mass is the amount of "stuff" or matter in an object
Define current
Current is the flow of electrical charges
What does one Kilowatt-hour mean
One kilowatt-hour means that a kilowatt of power has been used for one hour
Define buoyancy
Buoyancy is a measure of the upward pressure a fluid exerts on an object
What is a physical change
It's a change that affects only the physical properties of a substance
What is mass measured in and what does it mean
Mass is measured in kilograms which is one of the primary units of the metric system
What is measured in volts
The energy level of any place in a circuit
What is the unit of power
The unit is Watt
What is the unit for pressure
The unit is pascal (Pa)
What is a chemical change
It's the results of chemical reaction, that is, the breaking of bonds in one or more substances, and the reforming of new bonds to create new substances
There are two units commonly used for force, what are they and which one do scientists prefer to use
Pound and Newtons; They prefer to use newtons
What is current measured in
German physicist George S. Ohm experimented with circuits to find the exact mathematical relationship present in most circuits. The relationship is called what
It is called Ohm's law
What is the formula for density
D= m/V
What are some ways to see physical change
By its size, shape, and state
The formula for acceleration is F= m*a. True or False
False
Is resistance how an object measures how easily charges flow through. True or False
True
Is the formula for current I=V/R. True or False
True
Force exerted on an object in a liquid is equal to the weight of the fluid displaced by the object. What is the relationship called
It is called Archimedes' principle
How do you know when a chemical change has occurred
When one or more starting substances are mixed and you get products that appear to be different from those starting substances.