OAR Mechanical Study Guide
Which of the following provides the best definition for what "strength" would be, in terms
of materials? - answer its ability to maintain shape
Which of the following can cause an object to accelerate? - answer Force
What is the primary distinguishing factor between speed and velocity? – answer
Displacement in time
What type of energy might you have at the top of a roller coaster? - answer Potential
energy
What is the center of gravity of an object? - answer the point where the object can be
balanced
What is the definition of viscosity? - answer the ease with which a fluid can flow
Two footballs have been placed 60 centimeters apart. They are identical in every way.
Where is the center of gravity relative to the second football? ___ centimeters away
toward football 1 - answer30
Removing a nail using a claw hammer is an example of you using _____ to assist
yourself - answermechanical advantage
When would you not need to use a pump? - answerMove water downhill
Which of the following is an example of a simple machine? - answerscrew
Which of the following is an example of a complex machine? - answercrank
If gear 1 turns clockwise, which way does gear 2 turn (assuming they are connected)? -
answercounter clockwise
What kind of force is used to slow down a car? - answerFriction
What is the formula that is used to calculate work? - answerW = F x S
If an engine with a power output of around 2 horsepower is 95% efficient, what would
the actual power output be, in horsepower? - answer1.90
A class 2 lever has the load placed between the fulcrum/pivot point and the effort being
placed on it. Which of these might be an example of this? - answerwheelbarrow
, Force per unit of distance is a description of what? - answerwork
Which one of the following might be a good example of a simple machine? -
answerladder
A machine is operating with an input (for work) of 215-foot pounds. The output of the
work for this machine is 204.25-foot pounds. What efficiency does this machine have,
considering the information above? - answer95%
If there are 20 lbs. on one side of a fulcrum (with equal lengths on both sides), which of
the following combinations of weights would be enough to balance the loads on that
fulcrum? - answer18 and 2
What kind of machine would a cam be considered? - answercompound
Multiplying applied force by the ratio of the areas to which it is being applied is a way to
find __________ - answerExerted force
A way of converting rotating motion of a crank - answerlinkage
If someone puts in 50 newtons of force and gets back 250 newtons of force, then whatis
the mechanical advantage? - answer5
Output force / input force is a description of ___? - answermechanical advantage
What is the name of the force between objects that attracts them together? -
answergravity
What might cause an object to accelerate? - answerforce, gravity, pulling on it, etc
What amount of force would have to be applied to move a box 25 meters? 55,000 joules
worth of work is utilized in the process of moving the box. - answer2200 newtons
A type of energy - answerheat
If two liquids that have different densities are mixed together, what will happen? -
answerseparate
What is the SI unit that is commonly used to measure mass? - answerkilograms
When people are using a seesaw, the seesaw will work most efficiently if the two people
have the same weight. Why? - answerprinciple of equilibrium
Shock absorption on vehicles is attributed to what? - answerelasticity of springs
Which of the following provides the best definition for what "strength" would be, in terms
of materials? - answer its ability to maintain shape
Which of the following can cause an object to accelerate? - answer Force
What is the primary distinguishing factor between speed and velocity? – answer
Displacement in time
What type of energy might you have at the top of a roller coaster? - answer Potential
energy
What is the center of gravity of an object? - answer the point where the object can be
balanced
What is the definition of viscosity? - answer the ease with which a fluid can flow
Two footballs have been placed 60 centimeters apart. They are identical in every way.
Where is the center of gravity relative to the second football? ___ centimeters away
toward football 1 - answer30
Removing a nail using a claw hammer is an example of you using _____ to assist
yourself - answermechanical advantage
When would you not need to use a pump? - answerMove water downhill
Which of the following is an example of a simple machine? - answerscrew
Which of the following is an example of a complex machine? - answercrank
If gear 1 turns clockwise, which way does gear 2 turn (assuming they are connected)? -
answercounter clockwise
What kind of force is used to slow down a car? - answerFriction
What is the formula that is used to calculate work? - answerW = F x S
If an engine with a power output of around 2 horsepower is 95% efficient, what would
the actual power output be, in horsepower? - answer1.90
A class 2 lever has the load placed between the fulcrum/pivot point and the effort being
placed on it. Which of these might be an example of this? - answerwheelbarrow
, Force per unit of distance is a description of what? - answerwork
Which one of the following might be a good example of a simple machine? -
answerladder
A machine is operating with an input (for work) of 215-foot pounds. The output of the
work for this machine is 204.25-foot pounds. What efficiency does this machine have,
considering the information above? - answer95%
If there are 20 lbs. on one side of a fulcrum (with equal lengths on both sides), which of
the following combinations of weights would be enough to balance the loads on that
fulcrum? - answer18 and 2
What kind of machine would a cam be considered? - answercompound
Multiplying applied force by the ratio of the areas to which it is being applied is a way to
find __________ - answerExerted force
A way of converting rotating motion of a crank - answerlinkage
If someone puts in 50 newtons of force and gets back 250 newtons of force, then whatis
the mechanical advantage? - answer5
Output force / input force is a description of ___? - answermechanical advantage
What is the name of the force between objects that attracts them together? -
answergravity
What might cause an object to accelerate? - answerforce, gravity, pulling on it, etc
What amount of force would have to be applied to move a box 25 meters? 55,000 joules
worth of work is utilized in the process of moving the box. - answer2200 newtons
A type of energy - answerheat
If two liquids that have different densities are mixed together, what will happen? -
answerseparate
What is the SI unit that is commonly used to measure mass? - answerkilograms
When people are using a seesaw, the seesaw will work most efficiently if the two people
have the same weight. Why? - answerprinciple of equilibrium
Shock absorption on vehicles is attributed to what? - answerelasticity of springs
