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Work
Test Description: Introduction to Work and Simple Machines
Instructions: Answer all questions to get your test result.
1) Work is described as
A
mass times acceleration.
B
a push or a pull.
C
two forces acting upon an object in opposite directions.
D
a force that cause an object to move in the same direction as the force.
2) Units used to express work in an equation are
A
joules
B
watts
C
ohms
D
newtons
3) A man pushes a crate with a force of 30 N. He pushes it for 40 meters. How much work does he do?
A
10 joules
B
300 joules
C
70 joules
D
1,200 joules
4) How are work and power related?
A
Power is how fast work happens.
B
Both are measured in joules.
C
Work and power are both forces.
D
Work is the continuance of motion in one direction.
5) To calculate power, you
A
add the joules to the time it takes to complete the task.
B
multiply the amount of work completed by the time it takes to do the task.
C
subtract the joules from the time it takes to complete the task.
D
divide the amount of work completed by the time it takes to do the task.
6) Machines
A
enable you to do less work.
B
only change the direction of hte forces involved in work.
C
only change the size of the forces involved in the work.
D
make work easier.
7) Which of the following is NOT a simple machine?
A
lever
B
wheel and axle
C
car engine
D
pulley
8) You lift up a 50 N chair to a height of 0.5 m and carry it 10 m across the room. How much work did you do?
A
60 j
B
25 j
C
35 j
D
500 j
9) Power is expressed in joules/second, also known as the
A
joule
B
watt
C
newton
D
ampere
10) In which of the following situations would you do the most work?
A
Lifting one 30 N bowling ball 2 meters off the floor
B
Lifting one 50 N barbell 2 meters off the floor
C
Lifting two 45 N bowling balls 1 meters off the floor
D
LIfting three 20 N weights 3 meters off the floor
*select an answer for all questions
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