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Chp 13 - Motion
Question | Answer |
---|---|
Type of motion the Earth has as it moves around the sun. | Constant Motion |
type of motion cars, trucks, and buses have when they move in many directions and at many speeds. | Variable Motion |
type of motion a pendulum has when it swings back and forth | Periodic Motion |
type of motion a wheel has when it spins around on an axle. | Circular Motion |
type of motion a rubberband has when you pluck it. | Vibrational Motion |
describes the speed and direction of an object's motion. | Velocity |
describes how far an object moves during a certain amount of time. Avg Speed = Distance / Time | Average Speed |
Any push or pull that acts on an object | Force |
four types of forces | gravity, magnetism, electricity, friction |
type of force that acts to slow down the motion of an object or keep it from starting to move. | Friction |
formula for calculating work | work = force x distance |
formula for calculating power | power = work / time |
joules | label for work |
watts | label for power |
all the forces acting on an object balance each other | equilibrium |
tendancy of an object to resist any change in motion. | inertia |
An object at rest stays at rest and an object in motion stays in motion until acted upon by an outside force. | Newton's First Law of Motion |
Describes how acceleration, mass, and net force are related | Newton's Second Law of Motion |
For every action, there is an equal and opposite reaction | Newton's Third Law of Motion |
When the fan on an airboat turns, it pushes air behind the boat, in turn, the air pushes the boat forward. | Third Law of Motion |
The greater the mass the greater the force needed to move the object. | Second Law of Motion |
A stationary ball will remain still until an outside force (like someone kicking it) moves it | First Law of Motion |
a device that changes the direction or amount of force needed to do work. | Machine |
four types of simple machines | Lever, Inclined Plane, Wheel and Axel, and Pulley |
a machine that uses two or more simple machines | Complex Machines |
the rate at which work is done | Power |
the rate at which velocity changes | Acceleration |