Intro to Motion
Who dominated scientific thought for almost 2000 years?
Aristotle
The velocity at which the magnitude of drag equals the object's weight
What is terminal velocity?
SI unit for work
What is a Joule(J)?
What three forms of assistance do machines provide
1. multiply the applied force.
2. multiply the distance the force moves something.
3. change direction of the force
Classical Physics
The SI unit of force
Newton (N)
The force that causes an object to travel in a curved path
What is centriPETAL force?
SI unit for power?
How much help a machine provides is called
mechanical advantage
A vector representing an objects change in position
Displacement
The space relative to which motion is measured?
Frame of reference
An object that hangs from a fixed point and swings back and forth because of gravity
What is a Pendulum?
The transfer of energy from one object to another by a force
What is work?
A measure of how well a machine converts input work into output work
Efficiency
A vector showing the combined effect of two or more other vectors
resultant
Name all three laws of motion
1. the velocity of an object does not change unless it is acted upon by an external force
2. the force required to accelerate an object at a certain rate equals the objects mass times the desired acceleration
3. For every action there is an equal and opposite reaction
The effect that the surface of an object has on friction using unitless values is called
coefficient
What is the unit used for momentum
kg m/s
One of the most versatile of the simple machine, can multiply force or speed with or without changing input direction
The lever
The study of motion and forces
Dynamics
Free-body diagram
The gravitational force exerted on an object near the surface of the earth or any celestial body
What is Gravity?
the rate of doing work, or work per unit of time
Power
a simple machine consisting of of a wheel over which a rope or cable is passed.
A pulley