If the molecules in the atmosphere moved
too slowly, the atmosphere would be a
liquid or solid layer.
Newtons 1st Law
Aristotle (384 322 BC)
Aristotle believed that
there were two kinds of
motion: natural motion and
Natural Motion - motion of objects toward
Chapter 24: Magnetism
3) All atoms have moving electric charges. Why then, aren't all materials magnetic?
8) Your study buddy claims that an electron always experiences a force in an electric field, but
not always in a magnetic field. Do you agree? Why or
Light from the Sun
Additive Primary Colors
The sun emits light of all frequencies.
However, the sun is brightest in the yellow-green
part of the spectrum.
Newtons 3rd Law
You hold an apple over your head.
Identify all the forces acting on the apple
and their reaction forces.
Action: your hand pushes up on the apple
Reaction: the apple pushes down on your hand
Action: the earth p
Chapter 5: Newtons Third Law of Motion
4) For each of the following interactions, identify action and reaction forces. (a) A hammer hits a
nail. (b) Earth gravity pulls down on a book. (c) A helicopter blade pushes air downward.
11) Is it true that, when
Chapter 19: Vibrations and Waves
9) What happens to the wavelength of a wave when the frequency decreases?
16) What kind of motion should you impart to a stretched coiled spring (or Slinky) to provide a
transverse wave? To provide a longitudinal wave?
Chapter 14: Gases
2) Why is there no atmosphere on the moon?
11) When boarding an airplane, you bring a bag of chips (or any item packaged in an airtight foil
package) and, while you are in flight, you notice that the bag puffs up. Explain why this happen
Chapter 4: Newtons Second Law of Motion
3) Is it possible to move in a curved path in the absence of a force? Defend your answer.
5) Since an object weighs less on the surface of the Moon than on Earths surface, does it have
less inertia on the Moons surf
Chapter 20: Sound
5) Why do flying bees buzz?
12) In Olympic competition, a microphone detects the sound of the starter's gun and sends it
electrically to speakers at every runner's starting block. Why?
15) Why is it so quiet after a snowfall?
21) Why doe
Chapter 27: Color
3) In a boutique store with only fluorescent lighting, a customer insists on taking dresses into the
daylight at the doorway to check their color. Is she being reasonable? Explain.
4) Why will the leaves of a red rose be heated more than
Chapter 2: Newtons First Law of Motion Inertia
7) A space probe may be carried by a rocket into outer space. What keeps the probe going after
the rocket no longer pushes it?
9) Your friend says that inertia is a force that keeps things in their place, eit
Chapter 3: Linear Motion
6) Can an automobile with a velocity toward the north simultaneously have an acceleration
toward the south? Explain.
10) Correct your friend who says, The dragster rounded the curve at a constant velocity of 100
Newtons 2nd Law
A rocket becomes progressively easier to
accelerate as it travels through space.
Why is this so? (Hint: About 90% of the
mass of a newly launched rocket is fuel.)
From Newtons 2nd law, a = Fnet/m.
Chapter 23: Electric Current
6) Your friend says that a battery supplies the electrons in an electric circuit. Do you agree or
disagree? Defend your answer.
12) Suppose you leave your car lights on while at a movie. When you return, your battery is too
Why is it easier to stop a lightly
loaded truck than a heavier one that
has equal speed?
The lightly loaded truck has less
kinetic energy and will therefore
require less work to stop it.
Chapter 7: Energy
9) When a rifle with a longer barrel is fired, the force of expanding gases acts on the bullet for a
longer distance. What effect does this have on the velocity of the emerging bullet? (Do you see
why long-range cannons have such long ba
Chapter 26: Properties of Light
3) What is the fundamental source of electromagnetic radiation?
9) Knowing that interplanetary space consists of a vacuum, what is your evidence that
electromagnetic waves can travel in a vacuum?
13) Your friend says that m
Chapter 22: Electrostatics
3) Why are objects with vast numbers of electrons normally not electrically charged?
4) Why do clothes often cling together after tumbling in a clothes dryer?
14) Strictly speaking, when an object acquires a positive charge by t
Chapter 28: Reflection and Refraction
8) Trucks often have signs on their backs that say; If you can't see my mirrors, I can't see you.
Explain the physics here.
11) To reduce glare from the surroundings, the windows of some department stores, rather than
Chapter 11: The Atomic Nature of Matter
6) If no molecules in a body could escape, would the body have any odor?
7) Where were the atoms that make up a newborn manufactured?
16) The atomic masses of two isotopes of cobalt are 59 and 60. (a) What is the nu
Chapter 13: Fluids
Density: = m
water = 1.000 103 kg
Pressure: p =
patm=1.013 105 Pa = 1 atm
Pressure in a Fluid: p = p0 + gd
Archimedes Principle: the magnitude of the buoyant force on an object partially or
*r'," Aru6-a,^ K</
Quiz #6: Momentum
Problem | (2 points)
Considertwo carts,of massesm and2m" at rest on an air track. If you pushfust onecart for 3 s,
andthen the otherfor the samelengthof time, exertingequalforce
Exam 1 Review
Exam 1 will cover the following topics:
Chapter 1,2 One-Dimensional Motion
Chapter 4,5 Newton's Laws
There will be 6 problems:
5 Problem Set type problems
1 Conceptual type question
Chapter 1, 2: Motion in One Di
ProblemI (2 points)
An aluminumnail hasan excesschargeof +3.2pC. Which of thefollowing changes
a) adding2.0 x 1Ore
"." A.Ot.rr*a K./
Quiz,llL:Kinematicsin One Dimension
Problem 1 (2 points)
lfa ball is thrown straight upwards, which of the choices below is true at the top of the ball's flight?
c) i, =0; Z, =0