Dynamics
The force that slows falling objects
Air Resistance
What is Newton's First Law?
An object at rest will remain at rest and an object in motion will remain in motion unless acted upon by an outside force.
A rock sitting at the top of a hill is an example of ________ energy.
Potential
A pulley is a modification of which simple machine?
Lever
Tell me about the different classes of levers.
"There are 3 different classes of levers. In the first-class..."
There are three classes of levers.
In a first-class lever, the fulcrum is in the middle — like a seesaw.
In a second-class lever, the load is in the middle — like a wheelbarrow.
In a third-class lever, the effort is in the middle — like a baseball bat or your arm.
F-L-E— Fulcrum, Load, Effort!
The maximum speed a falling object can reach
Terminal Velocity
What is another name for Newton's First Law?
Law of Inertia
A rock rolling down a hill is an example of __________ energy.
Kinetic
If someone needs the force to be 3 times less (easier) to lift something, how many pulleys are needed?
3
How does heat flow?
Heat flows by radiation, conduction, and convection.
Who is the scientist who studied falling bodies?
Galileo
What is Newton's Second Law of Motion?
The force required to move an object is equal to the object’s mass times its acceleration.
A change in position due to an applied force; or when a force moves an object over a distance.
Work
A wheel and axle is a modified _________.
lever
What are the six simple machines?
The six simple machines are the lever, inclined plane, wheel and axle, wedge, pulley, and screw. All of the simple machines are based on two of these: the lever and the inclined plane.
The point where an object's mass is balanced or concentrated
Center of Gravity (or Mass)
What is Newton's Third Law?
For every action there is an equal and opposite reaction.
A push or pull on an object
Force
In a gear system, which has the greater speed? The small or larger gear?
Smaller gear
What is the Law of Conservation of Energy?
The Law of Conservation of Energy states that energy cannot be created or destroyed; it can only change form.
What two factors affect the strength of gravity?
Mass and Distance
What is another name for Newton's Third Law of Motion?
Law of Action and Reaction
Work done over time; the rate at which work is done
Power
How do you "pay" for the mechanical advantage of a ramp?
Over a longer distance
What is the difference between Centripetal and Centrifugal forces?
Centripetal force pulls toward the center of a circle — like a string pulling a spinning ball.
Centrifugal force feels like it's pushing outward — like being pushed to the side in a turning car.