Vocabulary
How fast an object’s position changes over time.
speed.
A machine that takes one force and changes its distance, direction, or strength.
a simple machine.
A flat, sloping surface is called an?
incline plan.
A seesaw moves around this point.
a fulcrum or pivot point
Also know as drag.
air resistance.
The force a machine supplies does what to help us?
Reduces the effort we need to apply
A force that opposes the motion of one object moving past another.
friction.
An example of a wedge.
a door stop, knife, fork, OR wedge for cutting wood.
What units do we use to measure forces?
Newtons
I am rubbing two sticks together. Name the major force.
friction.
The change in the speed of an object over time is called?
acceleration.
A change in position over time
motion.
How does a pulley work?
Reduces the effort needed to move the load up or down.
If the input is a downward motion and the output is an upward motion - what simple machine am I using?
a pulley OR lever.
Happens when an object slows down.
deceleration.
mass and speed together create?
momentum.
When an object moves through air, the air hits the object and slows it down. What is this force called?
air resistance.
The turning of the wheel around an axle.
What is the effort of a wheel and axle.
The equation for speed
distance divided by time.
Name the surfaces from the least amount of friction to the most amount of friction: gravel, ice, grass
ice, grass, gravel.
Any push or pull from one object to another.
force.
The force you apply to the machine.
effort.
If the effort I apply is a twist, and the output is the object moving downwards, what type of simple machine am I using?
a screw.
Two ways to increase momentum.
increase weight and increase the initial force.
Which direction would a force diagram for weight go?
downwards