Definitions
What is Work?
Work is force applied across a distance.
or
Work is force times distance
What is a Physical System?
A physical system is a system made up of physical parts (objects or machines) that work together to perform a task.
What metric unit is usually used for distance?
Meters (m)
What is the formula for Work?
Work = Force X Distance
or
W = F x D
Calculate the work of a cart pushed for 5 m with a force of 120 N
The work done is 600 Joules (J).
What is force?
a force is a push or pull acting upon an object
What number do we use for gravity in force of gravity calculations?
9.8
What units are used for mass?
Grams or Kilograms
g or Kg
What is the formula for the Force of Gravity?
Force of Gravity = Mass X Gravity
or
F(g)=m x g
Calculate the mechanical advantage of box that has an input force of 75 N, and an output force of 300 N
The mechanical advantage is 4.
What is energy?
What is a social system?
A social system is a system made up of people, organizations, and rules that work together to meet a need in society.
What unit do we use for force calculations?
What is the formula for Mechanical Advantage?
Mechanical Advantage = Output/FO ÷ Input/FSM
or
Ma = O/FO ÷ I/FSM
Calculate the force of gravity acting on a toolbox with a mass of 15 Kg
The force of gravity acting on the toolbox is 147 Newtons (N)
What is efficiency?
Efficiency is a comparison of the useful output of energy/work/force in relation to the total input in a given system.
What is displacement
Displacement is how far an object moves in a specific direction from where it started.
What unit do we use for Work?
What is the formula for efficiency?
Efficiency % = (Useful Work Output ÷ Total Work Input) x 100
Calculate the output force of a pulley system with a mechanical advantage of 4, and an input/FSM force of 150N
The output force is 600 Newtons (N)
What is mechanical advantage?
Mechanical advantage is a measure of the increase of force achieved by using a system.
orWhat is energy dissipation?
Energy dissipation is when energy spreads out or is “lost” to the surroundings, usually as heat or sound, instead of being used for useful work.
What units are used for power?
Watts (W)
A simple machine requires 600 J of input work.
It produces 450 J of useful output work.
Calculate the efficiency of the machine.
The efficiency of the machine is 75%