Resistance In Mechanical Systems Question Preview (ID: 1295)


Principles Of Technology Unit 4: Resistance Subunit: 1 Mechanical Systems. TEACHERS: click here for quick copy question ID numbers.

What are the two types of resistance in a mechanical system?
a) drag force and friction
b) drag force and acceleration
c) friction and lubricant
d) lubricant and drag force

The upwards force on an airplane flying through the air is called
a) lift.
b) thrust.
c) drag force.
d) gravity.

What symbol represents the coefficient of friction?
a) Ој
b) ПЃ
c) П‰
d) О±

The normal force (N)
a) is the upward force that is at a right angle to the sliding surfaces.
b) is the downward force that is at a right angle to the sliding surfaces.
c) is the force that keeps the object in motion.
d) is the force that opposes the motion of an object.

The type of friction that must be overcome to start moving an object is called
a) static friction.
b) kinetic friction.
c) coefficient of friction.
d) normal friction.

As the coefficient of friction increases, the force required to move an object
a) increases.
b) decreases.
c) remains the same.
d) is halved.

Weight is an example of
a) force.
b) mass.
c) gravity.
d) velocity.

If an object is moving at a constant speed, then the sum of the all forces on the object
a) equals zero.
b) is greater than one.
c) is less than one.
d) is halved.

________ reduces friction in mechanical systems.
a) Lubricants, streamlining
b) Lubricants only
c) Streamlining only
d)

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

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