ch.12 key terms

Question 1

coefficient of friction

Answer 1

that serves as an index of the interaction between 2 surfaces in contact

Question 2

coefficient of restitution

Answer 2

that serves as an index of elasticity for colliding bodies

Question 3

friction

Answer 3

force acting at the area of contact between 2 surfaces in the direction opposite that of motion or motion tendency

Question 4

impact

Answer 4

collision characterized by the exchange of a large force during a small time interval

Question 5

impulse

Answer 5

product of a force and the time interval over which the force acts

Question 6

kinetic energy

Answer 6

energy of motion calculated as 1/2 mv^2

Question 7

kinetic friction

Answer 7

constant magnitude friction generated between 2 surfaces in contact during motion

Question 8

linear momentum

Answer 8

quantity of motion, measured as the product of a body’s mass and its velocity

Question 9

maximum static friction

Answer 9

maximum amount of friction that can be generated between 2 static surfaces

Question 10

normal reaction force

Answer 10

force acting perpendicular to 2 surfaces in contact

Question 11

perfectly elastic impact

Answer 11

impact during which the velocity of the system is conserved

Question 12

perfectly plastic impact

Answer 12

impact resulting in the total loss of system velocity

Question 13

potential energy

Answer 13

energy by virtue of a body’s position of configuration, calculated as the product of weight and height

Question 14

power

Answer 14

rate of work production, calculated as work divided by the time during which the work was done `

Question 15

strain energy

Answer 15

capacity to do work by virtue of a deformed body’s return to its original shape

Question 16

work

Answer 16

in a mechanical context, force multiplied by the displacement of the resistance in the direction of the force