what is the purpose of machines?

• to make things work

• to make things easier to handle

• to ease work

• to waste energy to do work

what is this?

• a pivot

• a pulley

• a lever

• a screw

what is the fixed point of a lever called?

• a pulley

• a nail point

• a fulcrum

• a load

how many classes of lever are there?

• 1

• 2

• 3

• 4

what component is in the middle for second class lever?

• fulcrum

• load

• effort

• nothing

what type of machine is this?

• inclined plane

• wedge

• pulley

• lever

what is this?

• pulley

• screw

• gear

• inclined plane

what is this?

• screw

• gear

• inclined plane

• lever

what is this?

• wheel and axle

• gear

• screw

• pulley

what is this machine called?

• pulley

• wheel and axle

• gear

• screw