Motion
The rate that velocity changes
What is acceleration?
The SI unit of force
What is a newton?
A sound wave is this type of wave
What is a longitudinal wave?
This is made of two or more simple machines that operate together
What is a compound machine?
What is speed?
The cause of Earth's ocean tides
What is the moon's gravity?
Sound travels quickest in this medium
What is a solid/cast iron?
The rate of doing work
What is power?
This is measured at any particular instant
What is instantaneous speed?
The net force when a pair of balanced forces act on an object
What is zero?
This causes a wave to "bounce back" like a basketball on a backboard
What is a reflection?
When a pushed object does not move, this amount of work is done
What is zero/no work?
Objects in free fall near the surface of the Earth experience this
What is constant acceleration?
The property of matter that resists changes in motion
What is inertia?
This part of the ear sends sound as coded signals to the brain
What is the inner ear?
Because of this, the efficiency of a machine is always less than 100%
What is friction?
This is the displacement if you walk from home 1 mile to the store, and then back home
What is zero?
What is the third law of motion?
This causes an ambulance siren to change pitch as it passes by
What is the Doppler Effect?
Reducing friction in a machine increases this
What is efficiency?