Kinetics

What is Kinetics?

• describes motion

• concerned with what causes a body to move the way it does

• study of systems in constant motion, either at rest (no motion) or moving with a constant velocity

Force is characterized by magnitude, direction, and point of application

• True

• False

External Forces that act within the body

• True

• False

You can directly measure force by...

(select all right answers)

• through assessing acceleration from a kinematic analysis of

  movement and using the Second Newton’s Law (f=ma).

• force plates.

• force transducers.

• strain gauges.

What is Moment of inertia?

• the inertial property for rotating bodies

• used as the index for mass distribution for calculating moment of inertia

• is the sum of the local term ( I s ω s ) and the remote term (mr 2 ω g ).

Impact is a collision characterized by...

• the exchange of a large force during a large time interval.

• the exchange of a small force during a small time interval.

• the exchange of a large force during a small time interval.

• the exchange of a small force during a large time interval.

Centripetal force...

• force directed toward the center of rotation for a body in rotational motion

• the inertial property for rotating bodies

• represents resistance to angular acceleration

Moment of inertia is the sum of the products of each particle’s mass (m) and the radius of rotation (r) for that particle squared.

I = Σmr 2

• True

• False

Which of the description below descript a perfectly plastic impact?

• in which the velocity of the system is conserved; (e = 1)

• in which there is a total loss of system velocity ; (e = 0)