Grade 8 Science: Structures: Systems in Action

Which of these is not a force?

• Mechanical Advantage 
• Friction 
• Gravity
• Buoyancy 

What is a side effect of a system? 

•  Exploring how systems affect people, other organisms, and the environment.
• All of the tasks or services that the system performs.
• The unintended or undesirable outputs of a system
• All of the things that go into a system to make it work.

Tags

NGSS.MS-LS2-4

Which of these is not considered an input of a system?

• sun
• gasoline
• energy
• flowers

Which of these is not a simple machine?

• Wheelbarrow 
• Screw
• Wheel and axle 
• Pulley 

What is the purpose of machines? 

• To recapture lost energy of prevent energy from escaping in the first place
• To reduce the amount of friction between two sliding parts
• To measure of how strong force is
• To help us use energy more efficiently/ do work easier. 

How does an inclined plane help us do work?

• Allows us to move heavy objects using a smaller force
• Magnifies input force
• Can be used to increase the size of the force or the speed
• By minimizing any force lost because of friction/slippage. 

Tags

NGSS.MS-ETS1-1

What two forces are involved when a machine is used to do work?

• push & pull 
• input force & output force 
• gravity & buoyancy 
• weight & gravity

What is mechanical advantage? 

• Basic accuracy training. 
• A measure of how strong the force of gravity is between two objects.
• When a machine reduces the chances of effectiveness.
• A measure of how much easier the machine makes the work.

Force is measured in:

• magnitude

• Joules

• g/cm³

• Newtons

What is not an input for a car?

• Applying force on the gas pedal 
• Movement 
• Turning the steering wheel 
• Gasoline