Circuits
If the resistors were light bulbs, how do you expect the brightness of the bulbs to be affected by adding more bulbs in series?
Brightness gets dimmer since less current or charge passing through each bulb AND smaller voltage drop across each bulb (the voltage gain at the battery is now distributed among 3 bulbs as opposed to just one).
If a wave is traveling at 60 cm/second and has a wavelength of 15 cm, what is the frequency?
f= 4Hz
Water is different from other substances because
It is more dense as a solid than a liquid
By what is the force that oppose motion between two surfaces that are touching?
Friction
What do balanced forces equal?
Equals zero net force
How is the current out of the battery (and back into it) affected by adding resistors in parallel? Explain
Charge flow out of the battery would increase since there are more pathways for current to go
What does amplitude measure?
How far the medium moves from rest position
Matter changing from a solid to a liquid is called
Melting
If a person runs 100m in 12s, what is his/her speed?
8.333 m/s
Which of Newton's laws explain inertia?
Newton's first law
How is the resistance of a circuit affected by adding additional pathways?
Total Resistance decreases (because more pathways for the charge to flow)
What is frequency?
How many waves go past a point in one second
The melting point of water is?
0C
What does a simple machine do?
Makes work easier
If an astronaut throws a ball in space, when will the ball stop?
It will continue to move at a constant velocity.
How does the voltage drop across each branch in a parallel circuit compare?
The voltage drop across each branch is the SAME in a parallel circuit.
Are sound waves transverse waves or longitudinal waves? Why?
Longitudinal waves because they move back and forth in the same direction as the wave.
Matter changing from a solid to a gas is called
Evaporation
What type of friction is air resistance also known as?
Drag
Why can you run into a person and knock them over if they are standing still?
Because of your momentum
If the resistors were light bulbs, explain in terms of charge flow (current) and energy per charge (voltage) which bulb would be brightest / dimmest.
The brightness of the bulb is related to - V (amount of electrical energy lost and converted to heat/light) and -I (the higher the current through the bulb, the more charge per sec converting energy to light) In this case, the voltage drop across each resistor is the same, so I determines the brightness. Since the current through the 10 resistor is greatest, it would be the brightest bulb. Conversely, since the current through the 30 resistor is least, it would be the dimmest bulb. Notice that the resistance doesn’t determine brightness since the 30 bulb was brightest when connected to the others in series.
Why can’t you calculate the frequency of the wave in the diagram? What information is missing?
Missing wave speed or the period. f = V / or f = 1/T
This matter has a fixed shape and volume with particles closely packed together with little movement. It is a
Solid
List the 4 types of friction in order of least to greatest strength.
Rolling, sliding, fluid, acid
What is a measure of Inertia?
Mass