## Glossary of 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.

- Torque-
- 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.

- Velocity–
- a vector quantity representing how fast and in what direction a body is moving..

- Acceleration-
- 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
- acceleration

- 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