Simple Machines
an axe blade is an example of which simple machine
wedge
Mary usually runs about 10 miles per hour
speed
for every action there is an equal and opposite reaction
3rd law
which unit is used to measure work
Joules
the spot where a lever turns
fulcrum
a broom is an example of which simple machine
lever
Mary ran along the track toward the east at 15 miles per hour.
velocity
force = mass x acceleration
2nd law
the decrease in effort that is needed to move an object is called
mechanical advantage
works against the effort force
resistance force
a doorknob is an example of which simple machine
wheel and axle
Mary increased her speed, passed the first place runner, and won the race.
acceleration
known as the law of inertia
1st law
which simple machine changes the direction of the force or reduces the amount of force needed to move an object
pulley
complex machine
a jar lid is an example of which simple machine
screw
Mary ran the 100 meter race.
Distance
You are skiing down a hill when your skis hit a rock. You go tumbling forward.
the ability to make something move
mechanical energy
credited with formulating the three laws of motion
a flagpole is an example of which simple machine
pulley
Mary ran around the track at 3 meters per second.
Acceleration (any change in direction is acceleration)
You sit in a chair and the chair holds you up.
3rd law
fixed unmoving object or location
reference point
combines multiple fixed and moveable pulleys
block and tackle