Simple Machines Flashcards
What is a Mechanism?
A machine that requires the application of a single force to do work.
Transfer this energy as efficient as possible, control direction of force
Name the 6 simple machines?
Lever (fulcrum) Pulley (fixed or moveable) Wheel and axle Inclined plane Wedge Screw
What happens when a small force pushes farther away?
The larger force pushes closer
When the force is bigger the distance is…..?
Smaller
What simple machine do we use the most?
Wheel and axle, but we use all simple machines daily
Definition of a 1st class lever?
Has a fulcrum between the input and output forces
Definition of a 2nd class lever?
Effort (input) between fulcrum and output
Definition of a 3rd class lever?
Force in the middle
Definition of a pulley?
Can changed direction of input and output forces depending on whether the pulley is fixed or moveable
Consists of a grooved wheel with rope or cable looped around it
Definition of a wheel and axle?
Consists of a shaft or axle that is attached to a larger disk called the wheel
Eg. Tightening a screw with a screw driver
Definition of an inclined plane?
A sloping surface on which an object can move is called an inclined plane
It reduces the force needed to move an object with greater distance
Definition of a screw?
An inclined plane wrapped around a rod
The definition of a wedge?
An inclined plane that travels through the object or material the longer and narrower the wedge, the greater it’s mechanical advantage
Definition of a mechanism?
Made of two or more simple machines
How do you find the mechanical advantage of a lever? Ideal mechanical advantage?
M.A-Input\output
I.M.A- length of input arm/ length of output arm
M.A of a pulley (fixed, moveable)
Ima of pulley
I.M.A- equal to the number of support ropes
M.A of wheel and axle
I.M.A of a wheel and axle
I.M.A- radius of wheel/radius of axle
Radius of axle/ radius of wheel
I.M.A for an inclined plane?
I.M.A- length of ramp/ height of ramp
I.M.A of a screw
The length of the three gives the ideal mechanical advantage
I.M.A of a wedge?
The longer and narrower the wedge the greater it’s mechanical advantage
What is the definition of Efficiency?
The efficiency of a machine measures the useful work done by the machine compared to the work needed to operate it.
How to calculate efficiency?
Useful output work (j) x 100%\input work
What type of simple machines consists of two inclined planes back to back?
Wedge
What type of simple machine is used in cars, trucks and bicycles?
Wheel and axle
What type of simple machine could be used to hold two prices of wood together?
Screw
When two or more simple machines are put together, what is it called?
Compound machines
Which item is an example of a wedge?
Axe blade
Simple machines make a job easier but they do not change the total amount of:?
Force
The amount a simple machines increased the effort force is referred to as:?
Mechanical advantage
What type of simple machine consisting of a slanted flat slope helps make a moving object up easier but requires people to move the object a longer distance?
Inclined plane
What can a simple machine change the size or direction of?
A force
What type of simple machine consists of a bar and a fulcrum?
A lever
What is the definition of a machine?
Any device that helps us do work
Name the three ways make work easier?
Increasing the force that can be applied
Increasing the distance over which the force is applied
But changing the direction of the force
