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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 J
B
200 N
C
zero
D
none of the above
2) What are the units of work ?
A
Nm
B
J
C
kgm2s2
D
all of the above
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
100 watts
B
400 watts
C
100 N
D
25 watts
4) A machine is a device that
A
can multiply and change the direction of an input force.
B
decreases the amount of work done by a given force.
C
increases energy
D
requires less work to do a given task
5) What is the mechanical advantage of a single fixed pulley ?
A
3
B
2
C
1.5
D
1
6) An incline plane
A
decreases the amount of work done.
B
changes the direction of the force only.
C
change both the magnitude and the direction of the force.
D
changes the magnitude of the force only.
7) Which of the following is a compound machine ?
A
a pulley
B
a wheel and axle
C
a ramp
D
a pair of pliers
8) What is the gravitational potential energy of a 50 kg box that is 8.0 m above the ground ?
A
550 J
B
5500J
C
3400J
D
4000J
9) What are the units for power?
A
watts
B
horsepower
C
all of the above
D
joules per second
10) Gravitational potential energy depends on the
A
the acceleration due to gravity.
B
the mass of the object.
C
the height of the object.
D
all of the above.
*select an answer for all questions
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