Science Strand D Review Game

Definitions

100

What is Work?

Work is force applied across a distance.

or

Work is force times distance

200

What is force?

a force is a push or pull acting upon an object

300

What is energy?

Energy is the ability to do work.

400

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.

500

What is mechanical advantage?

Mechanical advantage is a measure of the increase of force achieved by using a system.

or 

Mechanical advantage is output/object force divided by input/simple machine force.

Definitions 2

100

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.

200

What number do we use for gravity in force of gravity calculations?

9.8

300

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.

400

What is displacement

Displacement is how far an object moves in a specific direction from where it started.

500

What 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.

Units

100

What metric unit is usually used for distance?

Meters (m)

200

What units are used for mass?

Grams or Kilograms

g or Kg

300

What unit do we use for force calculations?

Newtons (N)

400

What unit do we use for Work?

Joules (J)

500

What units are used for power?

Watts (W)

Formulas

100

What is the formula for Work?

Work = Force X Distance

or

W = F x D

200

What is the formula for the Force of Gravity?

Force of Gravity = Mass X Gravity

or

F(g)=m x g

300

What is the formula for Mechanical Advantage?

Mechanical Advantage = Output/FO ÷ Input/FSM

or

Ma = O/FO ÷ I/FSM  

400

What is the formula for efficiency?

Efficiency % = (Useful Work Output ÷ Total Work Input) x 100

Calculating

100

Calculate the work of a cart pushed for 5 m  with a force of 120 N

The work done is 600 Joules (J).

200

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.

300

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)

400

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)

500

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%