Download Unit Four Exam Review

Physics Unit 2 Exam Review
The following review questions will help you to prepare for the upcoming Unit
Exam. In each of the sections there are terms to define, true and false
questions, and response questions. Please use the chapters provided and your
class notes to help you to complete this review.
The review will be collected the day of the exam!!!
Chapter 6: Energy:
Define and understand the following terms:
Conservation of energy
efficiency
Kinetic energy
machine
Power
watt
Work-energy theorem
energy
potential energy
work
1. Machines decrease the amount of energy that is needed to do work.
(True or False)
2. Because of friction, using machines increases the amount of energy that is
needed to do work.
(True or False)
3. What is the difference between work and power and what are the units of
both?
4. A boy pushes on a parked car with a force of 200 N. The car does not
move. How much work does the boy do on the car?
5. A man pushes a crate along a factory floor by exerting a force of 55 N. If
the crate moves a distance of 4.0 m, how much work does the man
perform?
6. A weight lifter presses a 400 N weight 0.5 m over his head in 2 seconds.
What is the power of the weight lifter?
7. What is the difference between kinetic and potential energy? Explain the
changes in these energy types as a rollercoaster travels on its track.
8. What is the gravitational potential energy of a 55 kg box that is 8.0 m
above the ground?
9. Gravitational potential energy depends on the ____
10. A medicine ball has a mass of 5 kg and is thrown with a speed of 2 m/s.
What is its kinetic energy?
11. The brakes on a car exert a frictional force of 6000 N in getting the car to
stop. If the work done by the brakes is 120 000 J in coming to a stop, how
many meters did the car travel after the driver applied the brakes?
12. An object weighing 75 N is dropped from the top of a building and falls a
distance of 28 m to the ground. How much work does gravity do on the
object from the time it is dropped to the time it hits the ground?
13. An object has a kinetic energy of 810 J after falling a certain distance. If
the mass of the object is 20 kg, what is the speed of the object at this
time?
Chapter 13: Waves and Sound:
Define and understand the following terms:
Amplitude
Destructive
Beats
interference
Bow wave
Longitudinal wave
Doppler effect
Period
Frequency
Refraction
Hertz
Resonance
Constructive
Shock wave
interference
Supersonic
1.
Sound wave
Standing wave
Transverse wave
Wave speed
Wavelength
2. The wavelength of the wave in the diagram is
3. The amplitude of the above wave is
4. Sound waves require a
5. Sound waves are
6. A wave has a period of 0.25 seconds. The frequency of this wave is
7. A person is standing still and listening to a siren sounding an alarm. The
frequency of the sound is 500 Hz. The person begins running toward the
sound at a rate of 20 m/s. The frequency of the sound the person hears
will
8. The frequency of a sound wave determines
9. How loud a sound is depends on
10. Resonance refers to an effect in which the
11. A sonar system measures distance by determining the
Chapter 14 Color and Light:
Define and understand the following terms:
Electromagnetic wave
Opaque
Electromagnetic spectrum
Transparent
1. The color of light is determined by ____ of the light waves.
2. Which type of electromagnetic wave has the greatest wavelength?
3. When light rays reflect off a rough surface, they
4. An image that results from an apparent path of light rays is called
5. Light that enters one end of a fiber optic cable reaches the other end by
means of
6. Light rays that pass through a lens change direction because
7. Which drawing illustrates the law of reflection?
Chapter #11:
Define and understand the following terms:
ampere
coulomb
Coulomb’s law
direct current
Electrical power
electrical resistance
Ohm’s law
parallel circuit
Voltage
static electricity
electric current
electrically polarized
series circuit
1. There is a repulsive force between two charged objects when
2. There is an attractive force between two charged objects when
3. When there is an equal amount of positive and negative charges on an
object, the object is
4. When a glass rod is rubbed with silk and becomes positively charged,
5. The electric force between charged objects is
6. Electric force varies depending on the
7. Potential difference is measured in
8. Current is the rate at which charges move through a(n)
9. The SI unit of resistance is the
10. Whether or not charges will move in a material depends partly on how
tightly ____ are held in the atoms of the material.
11. Which 3 characteristics affect a material’s resistance?
12. There is a potential difference of 12 V across a resistor with 0.25 A of
current in it. The resistance of the resistor is
13. A 13
across the resistor?
14.
there is a potential difference of 120 V across the resistor?
15. Appliances connected so that they form a single pathway for charges to
flow are connected in a(n)
16. A device that protects a circuit from current overload is called a(n)