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Work And Energy
Test Description: Test review for chapter 12.
Instructions: Answer all questions to get your test result.
1) A boy pushes on a parked car with a force of 200 N. The car does not move. How much work does the biy do on the car?
A
200 N
B
none of the above
C
zero
D
200 J
2) What are the units of work ?
A
all of the above
B
Nm
C
J
D
kgm2s2
3) A weightlifer presses a 400 N weight 0.5 m over his head in 2 seconds. What is the power of the weightlifter?
A
400 watts
B
100 watts
C
25 watts
D
100 N
4) A machine is a device that
A
increases energy
B
requires less work to do a given task
C
decreases the amount of work done by a given force.
D
can multiply and change the direction of an input force.
5) What is the mechanical advantage of a single fixed pulley ?
A
2
B
1.5
C
1
D
3
6) An incline plane
A
change both the magnitude and the direction of the force.
B
changes the magnitude of the force only.
C
changes the direction of the force only.
D
decreases the amount of work done.
7) Which of the following is a compound machine ?
A
a ramp
B
a wheel and axle
C
a pair of pliers
D
a pulley
8) What is the gravitational potential energy of a 50 kg box that is 8.0 m above the ground ?
A
5500J
B
4000J
C
3400J
D
550 J
9) What are the units for power?
A
watts
B
all of the above
C
joules per second
D
horsepower
10) Gravitational potential energy depends on the
A
the acceleration due to gravity.
B
the height of the object.
C
the mass of the object.
D
all of the above.
*select an answer for all questions
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