Mechanical Comprehension – Test 4

Precession is the circular motion of the pole of the axis of a spinning object around another axis due to a torque.

Total linear acceleration is the vector sum of the centripetal acceleration vector and the tangential acceleration vector.

Compressive strain is the type of strain that occurs when forces are contracting an object, causing its shortening.

Gravitational torque is the type of torque on a body caused by its weight; and occurs when the center of gravity of the body is not located on the axis of rotation.

Stress-strain diagram is the graph showing the relationship between stress and strain, characteristic of a material.

Elastic limit is the stress value beyond which material no longer behaves elastically and becomes permanently deformed.

Normal pressure is the pressure of one atmosphere, and serves as a reference level for pressure.

An orbital period is the time required for a satellite to complete one orbit.

Center of gravity is the point where the weight vector is attached.

A neutron star is the most compact object known—outside of a black hole itself.

A black hole causes mass to become so dense, that it collapses in on itself, creating a singularity at the center surround by an event horizon.

Spring tide is created when the Moon, the Sun, and Earth are along one line.

Plastic behavior is the behavior in which material deforms irreversibly, and does not go back to its original shape and size when load is removed and stress vanishes.

Kepler's first law states that every planet moves along an ellipse, with the Sun located at a focus of the ellipse.

Compressibility is the reciprocal of the bulk modulus.

Torque is the cross product of a force and a lever arm to a given axis.