Unit 2
Motion and Force
Motion and Force
Do balanced or unbalanced charges result in a change in motion?
Unbalanced
(Concept 3 p. 20)
Give 1 example of potential energy and one example of kinetic energy. Label each one.
- Potential: parked car
- Kinetic: moving car
Where is the magnetic field the strongest?
At the poles.
Who came up with the model that says that electrons travel in fixed orbits around the nucleus.
Bohr
Why do elements form compounds?
To be stable.
Which of Newton's laws would explain the following scenario: You run into a friend while skating and you both fall in opposite directions.
Newton's 3rd Law: Every action has an equal and opposite reaction.
How much gravitational potential energy does a 10 kg rock have if it is sitting on the edge of a cliff that is 40 meters high?
GPE = height x acceleration due to gravity x mass
GPE = 10 x 9.8 x 40
GPE = 3,920 Joules
A circuit that does not make a complete path would be.....
Open
How many electrons can be held in the first energy level?
2
Name this chemical formula: Al2O3
Aluminum oxide
Ignoring air resistance and friction, what should be observed about two objects that are dropped at the same time?
Both objects should have the same acceleration. (Concept 3 p. 22).
List the type of potential energy each items has:
A: A Sandwich
B. A Trampoline
A: Chemical Potential Energy
B: Elastic Potential Energy
What is the accumulation of excess electric charge called?
Static Electricity
Which number can be used to determine the identity of an element?
Atomic number
What will magnesium do to become stable?
Lose 2 electrons.
A car is traveling 45 km/hr and accelerates to a speed of 55 km/hr in 0.5 hr. What is the car's acceleration?
List the energy transfers:
A: Fireworks
B: Windmill
Fireworks: light to thermal to sound
Windmill: Kinetic to electric
If a 20 amp current has a resistance of 30 ohms, what is the voltage difference?
600 V
Concept 2 p. 8
This element is the only one in its group that belongs with the group # (due to having the same # of valence e-) but not with the group name (because it is a different classification).
Hydrogen
When an atom loses an electron its charge is _____ and it is called a(n) ________ .
Positive; cation.
The Maximum speed a falling human can reach is 55 m/s. What is the name for this speed and what two forces become balanced for this to be possible?
Terminal velocity
Gravity and Air Resistance
(Concept 3 p. 22)
Describe this energy transfer/conversion:
A man eating dinner, then tap dancing.
Chemical to kinetic to sound/thermal
Explain how a battery works.
A chemical reaction creates a voltage difference between terminals that causes current to flow out of the (-) end to the (+) end.
Write the two types of isotope notation for the most common form of Sodium in nature.
Sodium-23
23Na
What is a covalently bonded group of atoms that is charged called?
Polyatomic ion.