Simple Machines
A simple machine consisting of an inclined plane on a fulcrum
What is a lever?
Work is equal to force times distance.
What is the work equation
This is the standard scientific definition of power.
What is the rate at which work is done (or energy is transferred)?
The ratio of output force to input force.
What is mechanical advantage?
The ratio of output work to input work as a percentage.
What is efficiency?
To change the direction of a force, increase force, or increase speed.
What are simple machines used for?
Work equals force multiplied by this
This standard international unit of power is equal to one Joule per second.
What is watt?
To calculate the total mechanical advantage of a compound machine, you do this mathematical operation to the mechanical advantages of each individual simple machine involved
What is multiplying them?
Efficiency compares useful output work to this type of work.
What is input work?
A simple machine that consists of a rope and grooved wheel.
What is a pulley?
In science, work is done when a force causes this
What is movement/displacement?
If two machines do the exact same amount of work, the machine that finishes first has more of this.
What is power?
Because mechanical advantage is a ratio of two identical units, its numerical value has this unique metric unit
what is none?
Increasing friction usually causes efficiency to do this
what is decrease?
This wedge is made for two simple machines
What is an inclined plane?
Work increases when either force or this increases.
What is distance?
Because power is defined as work divided by time, a machine with a mechanical advantage of 5 does not change the total power required, assuming this timeline value stays identical.
What is time?
If a simple machine has a mechanical advantage exactly equal to 1, it does not change the amount of force, but instead changes this property of force.
What is it’s direction?
This formula is used to calculate efficiency.
What is Efficiency=Input Work/Output Work×100?
A lever has its fulcrum placed very close to the load. This increases the machine’s ability to multiply this.
What is force?
Work is maximized when force and motion are aligned at this angle
What is 0 degrees?
A motor lifts a 40‑kg crate straight up at a constant speed. It takes 5 seconds to lift the crate 10 meters. A second motor lifts an 80‑kg crate the same 10 meters in 12 seconds. This motor produces more power.
What is the first motor?
A mechanism links a driving wheel with a diameter of 3 inches to a driven wheel with a diameter of 12 inches. This is the overall mechanical advantage of this assembly
What is 4?
Even in well-designed machines, some energy is always transformed into this less useful form because of friction.
What is heat(thermal energy)?