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Resistance In Mechanical Systems
Test Description: Principles of Technology Unit 4: Resistance Subunit: 1 Mechanical Systems
Instructions: Answer all questions to get your test result.
1) What are the two types of resistance in a mechanical system?
A
lubricant and drag force
B
friction and lubricant
C
drag force and acceleration
D
drag force and friction
2) The upwards force on an airplane flying through the air is called
A
drag force.
B
gravity.
C
thrust.
D
lift.
3) What symbol represents the coefficient of friction?
A
О±
B
Ој
C
ПЃ
D
П‰
4) The normal force (N)
A
is the force that opposes the motion of an object.
B
is the downward force that is at a right angle to the sliding surfaces.
C
is the upward force that is at a right angle to the sliding surfaces.
D
is the force that keeps the object in motion.
5) The type of friction that must be overcome to start moving an object is called
A
kinetic friction.
B
static friction.
C
normal friction.
D
coefficient of friction.
6) As the coefficient of friction increases, the force required to move an object
A
remains the same.
B
is halved.
C
decreases.
D
increases.
7) Weight is an example of
A
gravity.
B
mass.
C
velocity.
D
force.
8) If an object is moving at a constant speed, then the sum of the all forces on the object
A
equals zero.
B
is less than one.
C
is greater than one.
D
is halved.
9) ________ reduces friction in mechanical systems.
A
Streamlining only
B
Lubricants, streamlining
C
Lubricants only
10) How much applied force is needed for a 50 lb. object to slide across a floor that has a coefficient of sliding friction of 0.4.
A
0.4 / 50 lb
B
0.4 * 50 lb
C
0.4 - 50 lb
D
0.4 + 50 lb
*select an answer for all questions
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