Forces
What unit is used for measuring forces?
Newtons (N)
A ________ is used to decrease the voltage from the power plant to only ______ V in your home.
transformer, 230 V
What is refraction?
The bending of light
List 3 heat sources
Sun, oven, heater, etc
What is resultant force?
The sum of all forces acting on an object
Name and draw (with 2 bulbs) the two types of circuits.
Series and parallel (plus drawing)
Convex and concave
What is the specific heat of water?
4.2 J/g x C
Tom is 65 kilos. What is his gravitational force?
65 x 9.8 = 637N
A circuit has two identical bulbs. Bulb 1 has a voltage of 5V flowing through. What is the total voltage of the power source?
Not possible to know, since the type of circuit is not given. Parallel = 5 V, Series = 10 V
How are the two construction rays drawn? Make a diagram
Top of object --> through middle of lens
Top of object --> horizontal to lens --> through focal point
What is the specific heat equation?
Q = c x m x delta t
What is the normal force?
The supporting force that is opposite to gravitational force.
A parallel circuit has 2 resistors, with 10 ohms and 30 ohms. What is the total resistance?
7.5 ohms
What is the lens equation?
1/f = 1/u + 1/v
List 3 conductors and 3 insulators
conductors - different metals
insulators - air, styrofoam, plastic, rubber, etc
What is the formula for calculating a moment?
M = F x R
Why does an incandescent bulb not obey ohms law?
The bulb heats up at higher voltages, therefore making it harder for the current to flow through and increasing the resistance.
435/14.5 = 30 times
What is the difference between heat and temperature?
Heat is dependent on mass and temperature isn't (heat is total energy and temperature is avg energy)