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Work & Power
Simple Machines
Energy
Bridges
Forms of Energy
100
Which of the following is NOT an example of work? a. picking up a book b. carrying a 50 lb rock for two miles c. pushing in your chair d. pulling a wheeled suitcase through the airport
b. carrying a 50 lb rock for two miles
100
What does a simple machine do? a. make work easier b. increase the amount of work c. decrease the amount of work d. nothing
a. make work easier
100
_______ energy is stored energy. a. kinetic b. potential c. lost d. simple
b. potential
100
_______ is the force on a bridge that pushes or shortens the thing it is acting on. a. tension b. friction c. gravity d. compression
d. compression
100
What type of energy is given off be vibrating objects? a.chemical b. sound c. thermal d. radiant
b. sound
200
What is the correct unit for power? a. meter b. joule c. watt d. gram
c. watt
200
Which of the following is an example of an inclined plane? a. hammer b. axe c. wheelbarrow d. ramp
d. ramp
200
_______ energy is the energy of motion? a. kinetic b. potential c. lost d. simple
a. kinetic
200
_______ is the force on a bridge that expands or lengthens the thing that is acting on it. a. tension b. friction c. gravity d. compression
a. tension
200
What type of energy is the energy of moving particles that make up matter? a.chemical b. sound c. thermal d. radiant
c. thermal
300
When a force is applied to an object and that object moves in the direction of that force is the definition of _______? a. power b. mass c. work d. machine
c. work
300
Which of the following is an example of a wheel and axel? a. hammer b. axe c. wheelbarrow d. ramp
c. wheelbarrow
300
A boy is playing with a yo-yo. When does the toy have the greatest potential energy? a. when it is in his hand b. the moment it leaves his hand c. half way to the ground d. when it is closest to the ground
a. when it is in his hand
300
What kind of shape do you find in truss bridges? They are used because they are strong and equally distribute the forces acting on them. a. rectangle b. square c. triangle d. hexagon
c. triangle
300
What type of energy is the energy stored in the bonds that hold atoms together as molecules? a. chemical b. sound c. thermal d. radiant
a. chemical
400
How much work is done to lift a 75 Newton bowling ball 2 meters off the floor and carry it 20 meters. a. 150 joules b. 40 joules c. 1,500 joules d. 0 joules
a. 150 joules
400
What do you call a machine made up of two or more simple machines? a. compound machine b. complex machine c. complicated machine d. confusing machine
a. compound machine
400
Kinetic energy depends on ______ and ______? a. mass and volume b. speed and weight c. weight and height d. speed and mass
d. speed and mass
400
What type of bridges consist of a series of cables hung from vertical towers? a. suspension bridge b. truss bridge c. beam bridge d. arch bridge
a. suspension bridge
400
The sun and other stars change nuclear energy into ______ energy. a.chemical b. sound c. thermal d. radiant
d. radiant
500
If pushing your chair took 40 joules of work, and you did it in 2 seconds, then how much power did it take to complete this work? a. 0 watts b. 20 watts c. 40 watts d. 80 watts
b. 20 watts
500
What is the mechanical advantage of a pulley that requires an input force of 5 N to do 10 N of work? a. 2 b. 5 c. 15 d. 50
a. 2
500
When would a roller coaster have the most kinetic energy? a. at the top of the hill b. half way down the hill c. at the bottom of the hill d. going back up the next hill
c. at the bottom of the hill
500
If a bridge is designed properly, the opposing forces of compression and tension _________. a. are not present b. have a net force greater than zero c. have a net force equal to zero d. have a net force less than zero
c. have a net force equal to zero
500
Green plants change radiant energy to ______ energy. a. chemical b. sound c. thermal d. light
a. chemical