Simple Machines Flashcards
Simple Machine
Anything that reduces or changes the direction of the force that must be applied to move any object
6 simple machines
- Inclined plane (ramp)
2.wedge
3.screw
4.Lever
5.wheel and axle
6.pulley
Inclined plane
What: Tilted flat surface
Ex: ramp
How do we use it: Wheel chair access
Wedge
What: Modified incline plane that can be moved with ease
Ex: Knife, axe
How do we use it: Cut food
Screw (Archimedes Screw)
What: Inclined plane that can be cut into a central core
How do we use it: Hold things together
Ex: Screw
Lever
What: Rigid bar that pivots at a point called “FULCRUM”
How do we use it: Load arm section between fulcrum and the object you want to move
What are the two components all forces have
Magnitude: How strong the force is
Direction: Which way the force is pushing /pulling
What is the unit we use to measure force
NEWTON (N)
What is mass
Measure of the amount of matter (material) in an object
What is weight
Measure of how strong the force of gravity is between 2 objects
Types of friction
Friction-is the force that resists motion objects in contact with eachother
Static friction-is the force that prevents rest from sliding against eachother
Sliding friction- is the force that acts against the movement and causes objects to slow down an eventually stop
Lubricant-is a substance that reduces friction and helps objects slide more easily
What is the definiton of mechanical advantage
Mechanical refers to ‘machine’ and advantage implies it is beneficial to use machines to make the task easier. Therefore mechanical advantage refers to the benefits of using a machine expressed as a number that compares input to output
what is ACTUAL MECHANICAL ADVANTAGE
Actual mechanical advantage is what really happens after the other forces have been taken into account. It can be caculated by dividing
AMA=MOF
———
MIF
What is IDEAL MECHANICAL ADVANTAGE
IDEAL MECHANICAL ADVANTAGE is what should happen according to the caculations
What is the M.A. when using a lever
load arm length
