PLTW Simple Machines Questions with Correct
Answers
What are simple machines? Correct Answer-Mechanisms that
manipulate magnitude of force and distance
What are the six simple machines? Correct Answer-Lever, wheel and
axle, pulley, inclined plane, wedge, screw
What is mechanical advantage? Correct Answer-The ratio of the
magnitude of the resistance and effort forces. The ratio of distance
traveled by the effort and the resistance force.
What is work? Correct Answer-The force applied on an object times
distance the object ravels parallel to the force
If the MA is greater than 1: Correct Answer-there is LESS EFFORT
FORCE but GREATER EFFORT DISTANCE to overcome the
resistance force.
If the MA is less than 1: Correct Answer-there is GREATER EFFORT
FORCE but LESS EFFORT DISTANCE to overcome the resistance
force.
What is IMA? Correct Answer-ideal mechanical advantage and it is the
ratio of distance traveled by effort and resistance
, What is AMA? Correct Answer-actual mechanical advantage and it is
the ratio of force magnitudes
What is a lever? Correct Answer-A rigid bar used to exert a pressure or
sustain a weight at one point of its length by the application of a force at
a second point and turning on a fulcrum at a third
What is a first class lever? Correct Answer-The fulcrum is located
between the effort and the resistance
What is a second class lever? Correct Answer-resistance is located
between the fulcrum and the effort force; ERF; mechanical advantage is
always greater than one
What is a third class lever? Correct Answer-The effort is located the
middle of the resistance and the fulcrum; REF; mechanical advantage is
always less than one
What is moment? Correct Answer-The turning effect of a force about a
point equal to the magnitude of the force times the perpendicular
distance from the point to the line of action from the point to the line of
action from the force
Formula for moment Correct Answer-M= d x F
What is torque? Correct Answer-A force that produces or tends to
produce rotation or torsion
Answers
What are simple machines? Correct Answer-Mechanisms that
manipulate magnitude of force and distance
What are the six simple machines? Correct Answer-Lever, wheel and
axle, pulley, inclined plane, wedge, screw
What is mechanical advantage? Correct Answer-The ratio of the
magnitude of the resistance and effort forces. The ratio of distance
traveled by the effort and the resistance force.
What is work? Correct Answer-The force applied on an object times
distance the object ravels parallel to the force
If the MA is greater than 1: Correct Answer-there is LESS EFFORT
FORCE but GREATER EFFORT DISTANCE to overcome the
resistance force.
If the MA is less than 1: Correct Answer-there is GREATER EFFORT
FORCE but LESS EFFORT DISTANCE to overcome the resistance
force.
What is IMA? Correct Answer-ideal mechanical advantage and it is the
ratio of distance traveled by effort and resistance
, What is AMA? Correct Answer-actual mechanical advantage and it is
the ratio of force magnitudes
What is a lever? Correct Answer-A rigid bar used to exert a pressure or
sustain a weight at one point of its length by the application of a force at
a second point and turning on a fulcrum at a third
What is a first class lever? Correct Answer-The fulcrum is located
between the effort and the resistance
What is a second class lever? Correct Answer-resistance is located
between the fulcrum and the effort force; ERF; mechanical advantage is
always greater than one
What is a third class lever? Correct Answer-The effort is located the
middle of the resistance and the fulcrum; REF; mechanical advantage is
always less than one
What is moment? Correct Answer-The turning effect of a force about a
point equal to the magnitude of the force times the perpendicular
distance from the point to the line of action from the point to the line of
action from the force
Formula for moment Correct Answer-M= d x F
What is torque? Correct Answer-A force that produces or tends to
produce rotation or torsion
