Simple Machines. Friction Review. Friction is the force we feel when things rub against each other The more things are pushed together, the more friction there is It is the force that opposes motion. Friction Review.
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Frictionis the force we feel when things rub against each other
The more things are pushed together, the more friction there is
It is the force that opposes motion.
Friction slows down the movement of things and turns motion into thermal energy (heat).
When you rub your hands together you can feel the thermal energy produced.
The mucus from a slug will decrease friction as the slug slides along the ground.
The purpose of a simple machine is to
A. increase the speed of work
B. change direction the force is acting in
C. increase Mechanical Advantage
- a machine’s ability to multiply input force
All machines are made from these 6 simple tools:
2. Inclined plane
5. Wheel and axle
A flat surface placed at an angle to a horizontal surface:
Ramp, roadways, slide, stairs
A lever is a rigid bar that rocks back and forth at the fulcrum
When a force is applied at one end, the other end moves.
The object to be moved is the load
There are three types of levers:
1st class lever-fulcrum is between the force and
the load: crowbar, seesaw, pliers
2nd class lever– load is between the
force and the fulcrum: nutcracker
3rd class lever– load and
fulcrum are at either end: broom,
baseball bat, hammer
A wedge is made of 2 inclined planes put together
A force is applied to the wedge to drive it into an object
knife, chisel, nail, axe
A pulley is a wheel with a grooved rim for placement of a rope.
A downward force on one side
results in an upward movement
on the other side.
flagpole, curtain cord, mini-blinds
attached to an object
2. a moveable pulley –
moves with the object
A screw is a spiral inclined plane.
jar lid, machine screw, mountain road
A bunch of levers pivoting around one fulcrum.
A wheel or crank
attached to an axle.
door knob, wheels of vehicles, gears
A complex machine is made of two or more simple machines.
Bicycle, wheel barrow, Rube Goldberg machine
List the simple machines in the Rube Goldberg complex machine that are numbered.