Level 126 Level 128
Level 127

Uniform Circular Motion & Gravitation


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Arc Length
Linear distance around a circle
pit
a tiny indentation on the spiral track moulded into the top of the polycarbonate layer of CD
rotation angle
the ratio of the arc length to the radius of curvature on a circular path:Δθ=Δs/r
Radius of curvature
r is (-)= convex mirror-> power is negative
radians
a unit of angle measurement
angular velocity
represented by a lower case omega (ω)
centripetal acceleration
a = centripetal acceleration
ultracentrifuge
a centrifuge optimized for spinning a rotor at very high speeds
Centripetal Force
A force directed towards the center of a circle that causes an object to follow a circular path
ideal banking
the sloping of a curve in a road, where the angle of the slope allows the vehicle to negotiate the curve at a certain speed without the aid of friction between the tires and…
ideal speed
the maximum safe speed at which a vehicle can turn on a curve without the aid of friction between the tire and the road
ideal angle
the angle at which a car can turn safely on a steep curve, which is in proportion to the ideal speed
banked curve
the curve in a road that is sloping in a manner that helps a vehicle negotiate the curve
fictitious force
a force having no physical origin
centrifugal force
a fictitious force that tends to throw an object off when the object is rotating in a non-inertial frame of reference
Coriolis force
the fictitious force causing the apparent deflection of moving objects when viewed in a rotating frame of reference
non-inertial frame of reference
an accelerated frame of reference
gravitational constant, G
a proportionality factor used in the equation for Newton's universal law of gravitation; it is a universal constant—that is, it is thought to be the same everywhere in the universe
Center of mass
same as center of gravity
microgravity
an environment in which the apparent net acceleration of a body is small compared with that produced by Earth at its surface
Newton's universal law of gravitation
every particle in the universe attracts every other particle with a force along a line joining them; the force is directly proportional to the product of their masses and inversely proportional to the square of the distance between them