Power and Energy
1 joule/second
What is a Watt?
When two objects with the same charge move away from each other.
What is repulsion (repel)?
Objects that float in water have this density.
What are objects with density less than 1 g/cm^3?
The magnitude of force divided by the area it acts on
What is pressure?
When Fnet > 0
What is a floating object?
Current x Voltage
What is Power?
Charged objects exerts a non-contact force on each other
What is electrostatic force?
1000 kg/m^3
What is the density of water?
Another name for N/m^2
What is a Pascal?
The water that moves out of the way when you submerge an object.
What is displaced water?
The units for electrical energy we pay for at home
What are kWh? (Killowatt-hours)
Objects lose electrons when rubbed together with another object
What is charging by friction?
The greek letter Rho
What is the symbol for density?
A liquid or a gas
What is a fluid?
Calculate: Will it sink or float in water?
mass of the object: 20 g
displace water: 25 cm^3
An object floating in water
The equivalent of 3,600,000 J
What is 1 kWh?
Objects transfer electrons by getting close to each other, but not touching
What is charging by induction?
The mass of 500 cm^3 of water
What is 500 g of water?
100 kPa on Earth's surface
What is atmospheric pressure?
Pressure x Area
What is force?
(Useful energy/total energy) x 100
What is electrical efficiency?
The total amount of current an object has received over a certain amount of time
What is charge?
Why do boats float in water?????
Large volume that is empty space (air). Meaning a lot of water is displaced. Weight of displaced water (buoyant force) is greater than the weight of the boat.
What is air pressure?
An object placed in water will feel an upthrust (buoyant) force equal to the weight of the water it displaces
What is Archimede's Principle?