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Physics 112 test 2


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Line of action-
an imaginary line extended indefinitely along the vector in both directions.
Axis of rotation-
an imaginary line around which an object rotates
Moment arm-
the perpendicular distance from the axis of rotation to the line of action of a force.
product of the magnitude of a force and its moment arm.
Rotational equilibrium-
The Sum of all torques about any axis equals zero (also known as Second condition of Equilibrium.)
Center of gravity–
a point at which the entire weight is a body may be considered as acting and produce the same resultant torque.
Constant Speed–
when an object covers the same distance in each successive unit of time.
Average Speed-
a ratio of distance traveled to time elapsed.
a vector quantity representing how fast and in what direction a body is moving..
the time rate at which velocity changes.
Instantaneous Velocity-
a vector quantity representing the speed at any point C. It is the time rate of change in displacement.
Uniformly Accelerated Motion –
motion in a straight line in which the speed changes at a constant rate.
Acceleration Due to Gravity-
the acceleration caused by the force the earth exerts on an object (also known as weight).
Newton’s Second Law –
Whenever an unbalanced force acts on a body, it produces in the direction of the force an acceleration that is directly proportional to the force and inversely proportional to the mass of the body.
Mass –
A measure of inertia. The amount of force required for one unit of acceleration.
Weight –
The force exerted by the earth on an object near the surface of the earth.
Slug –
The USCS unit for mass. (1 lb / 1 ft/s²)
Newton –
The Force that will cause an object with inertia to move at 1 m/s².
instantaneous speed
a scalar quantity representing the speed at the instant the car is at an arbitrary point C. (The time rate of change in distance.)
final velocity plus intitial velocity divided by two.
Average velocity
acceleration times delta time plus intial velocity
final velocity
final velocity squared - intial velocity squared divided by 2 times delta distance
1/2 of acceleration times delta time squared plus the intial velocity times the delta time.
Delta displacment
distance / time
avereage velocity
velocity / time
average acceleration

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