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What does speed measure?
how fast an object moves over a given period of time
If a train travels at 800 miles in 5 hours, what is its rate of speed? (In MPH)
160 MPH
If you say that an airplane is traveling 600 mph west, you are describing its ________.
Velocity
What is a force?
The force of gravity _______.
pulls
The size and distance of objects from each other
The magnetic force _________.
pushes and pulls
What creates the force of electricity?
the gain or loss of electrons
What does friction do?
holds things back or slows them down
How much or little friction is produced depends on what?
The shape, speed, and material of the objects
What must happen for work to be done?
The object must move.
Force x Distance = Work
Work is measured in ______.
joules
Force is measured in _______.
newtons
55N x 4ft = ?
220 joules
What is power a measurement of?
All of the different forces that act on an object are called what?
net forces
equilibrium
How will an object in equilibrium behave?
It will remain still or continue to move in a straight line at a steady rate of speed.
What do Newton's laws describe?
motion
The formula that describes Newton's Second Law is what?
Force = Mass x Acceleration
The Law of Inertia states what?
an object in motion will stay in motion and an object at rest will stay at rest unless acted upon by another force
A lever, wedges, and inclined plane are all examples of what?
simple machines
Why is an inclined plane useful?
It connects a lower place to a higher place.
Which simple machine is an inclined plane wrapped around a rod?
A screw