Mechanical Systems Flashcards
Fill in the blank: The formula for mechanical advantage is __________.
Output force / Input force
True or False: The speed ratio is always greater than or equal to the mechanical advantage.
True
How do we find the Mechanical Advantage if we know what the efficiency and speed ratio is?
Mechanical advantage is equal to speed ratio multiplied by efficiency.
How do you calculate efficiency using work?
Efficiency = (Useful work output / Total work input) x 100%
What is the unit of work?
The unit of work is the Joule (J).
Work formula:
Force(F) x Distance(d)
What is friction?
Friction is the force that opposes motion
Define power in a mechanical context.
Power is the rate at which work is done or energy is transferred.
What is the formula for power?
Power = Work / Time
Fill in the blank: The unit of power is __________.
Watt (W)
What is the relationship between work, power, and time?
Power is equal to work done divided by the time taken to do that work.
True or False: A machine that has a mechanical advantage of 2 means it doubles the input force.
True
What is the significance of a machine’s efficiency?
Efficiency indicates how well a machine converts input energy into useful output work.
What does it mean if a machine has 100% efficiency?
It means all the input energy is converted into useful work without any losses.
Fill in the blank: A lever that is longer on one side than the other provides __________ mechanical advantage.
greater
True or False: In a pulley system, adding more pulleys always increases mechanical advantage.
True
What is the primary purpose of machines in mechanical systems?
To make work easier by increasing mechanical advantage or speed.
What is an example of a simple machine?
Lever, pulley, inclined plane, wheel and axle, screw, or wedge.
True or False: A machine can have a high mechanical advantage and low efficiency.
True
What is the definition of input force?
The force applied to a machine to perform work.
