Download 2nd semester study guide

Physics
Study Guide/Final - Spring 2015
You can use a single sheet of paper for formulas, notes, etc.
Chapters Covered
Chapter 6 - Forces
Chapter 9 – Momentum
Chapter 11 - Energy
Chapter 21 - Electric Fields
Chapter 23 - Series and Parallel Circuits
Chapter 7.3 - Circular Motion
Chapter 10 - Energy and Work
Chapter 20 - Static Electricity
Chapter 22 - Current Electricity
Things to know for the multiple choice section
1. How to determine weight.
If you have a mass of 70 kg what would be your weight on earth?
What would be your mass if you went to the moon (g=1.6 m/s2)?
2. The forces acting on an object and the idea of net force.
You’re driving your car with a constant velocity, what does that say about the
forces acting on the car? Sketch a force diagram.
You are riding your bike with a force of 200 N when you apply the brakes with a
force of 500N what is the net force?
3. Newton’s 3 laws of motion.
State the 1st, 2nd, and 3rd laws of motion. Be able to relate these laws to given
situations.
Using Newton’s 2nd law:
Two football players hit a running back with the same force. If players A has a
mass that is double player B; what does that say about their accelerations?
If the mass is doubled and acceleration remains constant, what does that say about
the force acting on the object?
If your 1000 kg car starts from rest and gets to a speed of 30 m/s in 10 sec., what
is the force applied to your car?
4. Know how an electroscope works.
If a negative object is brought near a positively charged electroscope, what will
happen?
When you get a shock on a dry winter day from your finger to a metal object,
what is it that is transferred from your finger tip to the metal object?
Explain polarization.
5. Know coulomb's law.
If one charge is doubled, what happens to the force between the two objects?
If the distance between charges is halved, what happens to the force between the
two forces?
6. Electric fields
What information does the drawing of the lines of force of an electric field
provide?
How many electrons are in a 10 coulomb lightning bolt?
What is the force on an electron that is in an electric field with an intensity of
450,000,000 N/C?
Draw a diagram of an electric (magnetic) field.
Draw electric (magnetic) field lines of 2 charges repelling each other and 2
charges attracting each other.
7. Circuits
Know how to find current, resistance, and voltage in parallel and series
circuits.
A 5 Ω resistor is in connected in series with two 10 Ω resistors which are
connected in parallel. What is the resistance of the circuit?
Three 50 Ω resistors are connected in series, what is the resistance of the circuit?
Three 30 Ω resistors are connected in parallel, what is the resistance of the
circuit?
Two 20 Ω resistors are connected in series with a 120 Volt outlet, how much
current is running through the circuit?
How much power does a 10 A lamp connected to a 120 V outlet use?
8. Friction
The coefficient of friction between your tire and the road is 0.3, what force does
it take to move your 1000 kg car at a constant velocity?
Does friction act perpendicular, in the same or in the opposite direction of
motion?
9. Impulse and momentum
A dancer moving at 3 m/s jumps into the arms of another dancer with identical
mass that is at rest. What is the velocity of the two dancers after impact?
What was the purpose of the containers you made for the egg drop? What did
they do to protect the egg?
A 10 kg toy car, moving at 5 m/s, collides with a 15 kg toy truck which is
stationary. What is the velocity of the truck after the collision if the car is now
moving at 2 m/s?
What is the velocity of an object if a 30 N force is acted on a 20 kg mass for 2 s?
10. Circular Motion
What force keeps an object moving in a circular path?
If the radius of a roller coaster loop is halved, what happens to the centripetal
force?
If the mass is doubled, what is the resultant centripetal force?
What remains constant in uniform circular motion?
When riding a merry-go-round, who would me moving at a greater velocity,
someone riding near the center or someone riding on the outside?
As you round a corner with your car, what provides the centripetal force that
keeps you moving in a circle?
Which direction does your acceleration point?
12. Energy
As an object gains height it gains ____________ energy.
As an object increases speed it gains ___________ energy.
Weighing 70 kg, you climb a 25 meter sledding hill; how much energy would you
have to sled down the hill?
If you ignore friction, at what speed would you be going at the bottom of
the hill?
13. Be sure to know the units for the variables in all the equations throughout the
semester.
14. Work and Power
How much power do you (m=60kg) generate if you climb 8 m up a rope in 48 s.
Helpful Problems from the Book
Chapter 6
Chapter 7.3
1, 3, 20, 30
49
Chapter 9
4, 27, 35 (e)
Chapter 10
1, 12, 19
Chapter 11
4, 7, 26, 30
Chapter 20
13, 20, 21, 25
Chapter 21
4, 5, 12, 23
Chapter 22
4, 15, 21, 28
Chapter 23
19, 20, 21, 28
Free Response Portion of the final
 Be able to determine electrical force by using Coulomb’s Law.
 Determine the number of electron’s in a specific charge.
 Given a combination circuit be able to find individual resistance, voltage, and
current as well as the total resistance, voltage, and current
 Be able to find Fn and use with the coefficient of friction to determine Ff. Use that
Ff with applied force to determine Fnet. Finally use Fnet to determine acceleration.
 Determine centripetal force using all of the circular motion equations
 Find potential energy. Transfer PE to KE to determine velocity. Understand the
concept of conservation of energy.
 Find momentum with 2 velocities in the same direction and opposite direction.
 Find impulse and apply the Newton’s 3rd law.
 Determine the velocity of an object after a collision by using conservation of
momentum (momentum before = momentum after).
* There will be no curve on the final exam - although you do have an opportunity to earn
extra points on you final.
Review sheet – 5 pts
Extra problems – 5 pts
Review Quizzes –
A – 4pts
B – 3 pts
C – 2 pts
D – 1 pt
Monday – Review quiz (Forces; Ch 6)
Tuesday – Review quiz (Electricity; Ch. 20-23)
Wednesday – Review quiz (Momentum, Energy, Circular Motion; Ch 7, 9, 11)