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Phys Sci Ch 14 A
Test Description: 1st part of chapter 14
Instructions: Answer all questions to get your test result.
1) A 1,125 W motor might also be rated as a
A
4 horsepower motor
B
1 horsepower motor
C
3 horsepower motor
D
0.5 horsepower motor
2) If you know the input distance and the output distance of a machine, which of the following can you calculate?
A
ideal mechanical advantage
B
actual mechanical advantage
C
work
3) An example of a compound machine is a
A
crowbar
B
ramp
C
bicycle
4) If you perform 50 joules of work lifting a 5 N box from the floor to a shelf, how high is the shelf?
A
20 m
B
10 m
C
1.5 m
5) The efficiency of a machine is always less than 100% because
A
the work input is too small
B
some work input is lost to friction
C
a machine cannot have an IMA greater than 1
6) The SI unit of power is the
A
newton
B
newton-meter
C
watt
7) A mechanical device requires 300 J of work to do 150 J of work in lifting a crate. What is the efficiency of the device?
A
.5%
B
50%
C
80%
8) If you have to apply 10 N of force on a crowbar to lift a rock that weighs 100 N, what is the actual mechanical advantage of the crowbar?
A
10
B
0.1
C
360
9) A force acting on an object does no work if
A
the force is not in the direction of the object's motion
B
a machine is used to move the object
C
the force is greater than the force of friction
10) An inclined plane reduces the effort force by
A
increasing the distance through which the force is applied
B
reducing the effort distance
C
increasing the work
11) A machine is a device that can multiply
A
work
B
force
C
power
12) The actual mechanical advantage of a machine
A
is less than the ideal mechanical advantage of the machine
B
decreases as the input distance increases
C
cannot be less than 1
13) 3730 watts equals about how many horsepower?
A
20
B
5
C
10
14) What is the unit of work?
A
newton/meter
B
joule
C
watt
15) How can a machine make work easier for you?
A
by changing the direction of your force
B
by decreasing the amount of work you do
C
by increasing the work done by the machine
16) An ax is an example of a(n)
A
wedge
B
inclined plane
C
lever
17) If you exert a force of 10 N to lift a box a distance of .2 m, how much work do you do?
A
0.1 J
B
10.9 J
C
2.0 J
18) If you exert a force of 300 N to walk 10 m up a flight of stairs in 10 sec, how much power do you use?
A
25,200 W
B
300 W
C
19 W
19) Reducing friction in a machine
A
increases its efficiency
B
decreases its actual mechanical advantage
C
decreases the work output
20) In which of the following is an example of a wheel and axle?
A
hammer
B
an automobile steering wheel
C
a jar lid
*select an answer for all questions
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