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Terms in this set (27)
A change in position over time is called ______________ .
A device that helps do work by either overcoming a force or changing the direction of the applied force is a _________ .
Mechanical Energy is ...
Kinetic or potential energy associated with the motion or position of an object
Capacity to do work is __________ .
What is a pulley?
A simple machine consisting of a wheel with a groove in which a rope can run to change the direction or point of application of a force applied to the rope
What is a Lever?
a simple machine that consists of a bar that pivots at a fixed point called a fulcrum
What is a Wheel?
a simple machine consisting of two circular objects of different sizes; the wheel is the larger of the two circular objects
What is an Axle?
The shaft on which the wheels revolve
What is a Screw?
An inclined plane wrapped around a cylinder
What is a Wedge?
A substance that tapers to a thin edge and is used for splitting, raising heavy bodies, or for tightening by being driven into something.
What is an Inclined Plane?
a flat, sloped surface
One of the six basic types of machines, which are the basis for all other forms of machines?
Kinetic Energy is also energy of ___________ .
Potential Energy is also known as ____________ .
Also known as compound machines, consists of two or more simple machines.
What is Mechanical Energy?
Kinetic + Potential Energy combined
What is the Law of Conservation of Mechanical Energy?
Whenever there is no friction acting on a system of objects, the total mechanical energy of the system remains unchanged.
Why do people like the Law of Conservation of Mechanical Energy?
It solved the problem of classical mechanics.
What is a Perpetual Motion Machine?
a machine that you set into motion initially, but then it continues to move by itself forever (no friction system)
Which 2 energies does the air track glider posses?
It switches between kinetic and elastic potential.
Which 2 energies does the pendulum posses?
Gravitational potential and kinetic
What is the end of a pendulum called?
Assuming it's a floor skimming pendulum, what is it's fastest point?
When it skims the floor
What is the formula for kinetic energy?
In a circular orbit, the planet would have the same speed __________ in the orbit.
What is the Perihelion?
The time when a planet is closest to the sun
What is the Aphelion?
The time when a planet is farthest from the sun
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