Current Events
I'm full of energy!
I'm shocked!
We Aren't Equal!
Let's Solve Inequality!
100
When thinking about a river flowing, ROCKS slow down the flow of the river.
In an electric circuit, what property is like the rocks in the river?
RESISTANCE is like the rocks in the river, slowing down the flow of water.
100
Connor McDavid shoots the puck at 90 miles per hour towards the net. The puck has _____________ energy, otherwise known as the energy of motion!
Kinetic energy
100
When I rub a balloon on my hair, __________ are transferred from my hair to the balloon.
When I rub a balloon on my hair, ELECTRONS are transferred from my hair to the balloon.
100
Say this inequality in words starting with "all the numbers that are..."
x>= -7
x>= -7
All the numbers that are bigger than or equal to -7.
100
Solve this inequality:
4x <20
x<5
200
When thinking about a river flowing off of a waterfall, the HEIGHT OF THE WATERFALL provides the "force" or "push" for the river to flow.
In an electric circuit, what property is like the height of the waterfall?
VOLTAGE is like the height of the waterfall.
200
Many types of energy are "stored" in some way, able to be used in the future for some purpose (like spinning a wheel, heating water, powering a computer, etc).
We call energy that is stored for later ______________ energy.
We call energy that is stored for later POTENTIAL energy.
200
The word static means _________.
The word static means STILL/AT REST.
200
Say this inequality in words starting with "all the numbers that are..."
100 < p
100 < p
All of the numbers that are bigger than 100.
200
Solve this inequality:
-6p > 30
p < -5
300
In an electric circuit, which property is like the speed of the flow of the river's water?
CURRENT is like the speed of the flow of the river's water.
300
When powering a lightbulb, electrical energy is converted into _____________ and _____________ energy.
When powering a lightbulb, electrical energy is converted into LIGHT and THERMAL energy.
300
You must answer all 3 of these correctly to get the entire question correct.
TRUE OR FALSE: A positively-charged balloon will attract another positively-charged balloon.
TRUE OR FALSE: A positively-charged balloon will repel a negatively-charged balloon.
TRUE OR FALSE: A negatively-charged ballon will attract a neutral (uncharged) object.
TRUE OR FALSE: A positively-charged balloon will attract another positively-charged balloon.
TRUE OR FALSE: A positively-charged balloon will repel a negatively-charged balloon.
TRUE OR FALSE: A negatively-charged ballon will attract a neutral (uncharged) object.
300
Say this inequality in words starting with "all the numbers that are..."
-4 <= x
All the numbers that are bigger than or equal to -4.
300
Solve this inequality:
4x -5 <=4+x
x<=3
400
a) How do powerplants generate electricity? Why did Mr. Gazer refer to powerplants as "basically giant tea kettles"?
b) Name 3 different ways a powerplant can generate electricity (hint: 3 different energy sources to power the kettle!).
a) How do powerplants generate electricity? Why did Mr. Gazer refer to powerplants as "basically giant tea kettles"?
[They spin turbines, which rotate magnets near wires to generate electricity. You just need some way of turning turbines! Boiling water and creating steam, which turns turbines, is the way it's traditionally done.]
b) Name 3 different ways a powerplant can generate electricity (hint: 3 different energy sources to power the kettle!).
[Coal/oil burning to boil water and turn turbines. Radioactive materials like uranium to boil water and turn turbines. Windmills to turn turbines. Sitting on a bike and pedalling, connected to a turbine.]
400
Why is the fluorescent "spiral" bulb more efficient than a traditional (incandescent) bulb?
The spiral bulb converts more of its electrical energy to light, and only produces a little bit of thermal energy (heat).
Traditional bulbs produce much more thermal energy/heat (wasted energy!)
400
After building up a bunch of electrons on a plastic rod, I bring it near a doorknob. I see a spark move from the rod to the doorknob.
This spark is called a ___________________.
This spark is called a STATIC (or ELECTRIC) DISCHARGE.
400
Name three values of x that match the following inequalities:
x <-5 and x >-11
x <-5 and x >-11
"Bigger than or equal to 0, and less than or equal to 5".
-6, -7, -8, -9, -10 or any decimal numbers in between.
400
Solve this inequality:
x/5+1<3
x<10
500
The band AC/DC is related to electricity!
What does AC stand for/mean? What about DC?
Bonus: Edison and Tesla each were promoting a different type of electricity for the public's use. Who promoted AC, and who promoted DC?
Alternating current (AC - Tesla)
Direct current (DC - Edison)
500
Without looking at your notes, name 7 different types of energy. The following provides some HINTS for you:
When things are hot
When things are high above the ground
When electrons are flowing
When a spring is stretched
When uranium nuclei power a powerplant
When an object is moving
When you clap
(answers may vary - check your duotang!)
500
Shown below is an animation of an electroscope. The red block is charged with electrons. At first, it moves near the conductor on the electroscope, and the leaves repel. Then, it touches, and the leaves repel.
a) Explain why the two leaves/metal sheets REPEL when the red block is brought near the top.
b) Then, explain why the two leaves/metal sheets REPEL when the red block touches the top.
Explain why the two leaves/metal sheets REPEL when the red block is brought near the top.
[Like a charged balloon moving near a wall, it repels/pushes electrons away inside the conductor, down into the leaves. They are then the same - charge, and repel.]
Then, explain why the two leaves/metal sheets REPEL when the red block touches the top.
[The red block transfers electrons to the conductor, and they spread out onto the leaves. They are then the same - charge, and repel.]
500
Does the number 7 make the following inequality true?
2x > 15
2x > 15
NO!
2(7) > 15
14 > 15 (not true!)
500
Solve this inequality:
3x -5 <= 2x + 5
x<=10