Forces
Two cars are traveling along the same road at the same speed but different velocities. What does this information tell you about the two cars?
a. one car is speeding up
b. both cars are speeding up
c. the cars are traveling in opposite directions
d. the cars are traveling in the same direction
C. The cars are traveling in opposite directions
The rate at which work is done is called _____.
a. efficiency
b. effort time
c. power
d. force
Large windows on the south side of a building is an example of ________.
a. active solar
b. passive solar
c. forcer air
d. radiator
b. passive solar
A path that allows only one route for an electric current is called a _________.
a. series circuit
b. parallel circuit
c. series current
d. parallel current
For a given wave, if the frequency doubles, the wavelenth _____.
a. quadruples
b. stays the same
c. doubles
d. is halved
d. is halved
mass
A winding mountain road is an example of a(n) ______.
a. inclined plane
b. wheel and axle
c. lever
d. block and tackle
a. inclined plane
The transfer of energy that does NOT require matter is ______.
a. convection
b. conduction
c. radiation
d. combustion
c. radiation
Lightning is ______.
a. a high-voltage electric current
b. a buildup of neutrons
c. harmless
d. a large discharge of static electricity
d. a large discharge of static electricity
True or False: the property of light that allows you to see yourself in a mirror is reflection.
In the absence of air, a penny & a feather that are dropped from the same height at the same time will _____.
a. fall at the same rate
b. fall at different rates
c. not have momentum
d. float
Work output of a machine divided by the work input is the ___________.
a. efficiency
b. effort time
c. force
d. power
a. efficiency
Which of the following would be the best insulator?
a. copper
b. aluminum
c. air
d. silver
c. air
True or False: the unit to measure current is the volt.
False.
The highest point on a wave is called the _______.
a. pinnacle
b. crest
c. trough
d. amplitude
b. crest
A 2000 N force acts on a 200 kg object. The acceleration of the object is _____.
a. 100 m/s2
b. 10 m/s2
c. 1 m/s2
d. 4000 m/s2
b. 10 m/s2
A doorknob is an example of what type of machine?
wheel and axle
True or False: Solar energy can be changed into thermal energy without any work being done.
a. true
If the output voltage from the transformer is 32 V with 60 turns of wire, and the input voltage is 64 V, how many turns of wire are there at the input?
120 turns of wire
_____ is a measure of how may wavelengths pass a certain point each second.
a. wavelength
b. frequency
c. amplitude
d. period
True or False: Lowering an object decreases its potential energy.
True
A device that does work with only one movement is ______.
a. compound machine
b. simple machine
c. mechanical machine
d. effort force
b. simple machine
Sitting on a warm rock on a sunny day is what type of energy transfer?
a. convection
b. conduction
c. radiation
d. combustion
b. conduction
A transformer that increases voltage is a _____.
a. voltage meter
b. step-up transformer
c. resistance transformer
d. step-down transformer
b. step-up transformer
Remember: Rabbits mate in very unusual expensive gardens.
Radio, Microwave, Infrared, Visible Light, Ultraviolet, Xray, Gamma Rays