Chapter 12

Question 1

coefficient of friction

Answer 1

number that serves as an index of the interaction between two surfaces in contact.

Question 2

coefficient of restitution force

Answer 2

number that serves as an index of elasticity for coliding bodies.

Question 3

friction

Answer 3

force acting at the area of contact between two 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(m)(v)^2

Question 7

kinetic friction

Answer 7

constant magnitude friction generated between two surfaces in contact during motion.

Question 8

linear momentum

Answer 8

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

Question 9

maximum static friction

Answer 9

maximum amount of friction that can be generated between two static surfaces.

Question 10

normal reaction force

Answer 10

force acting perpendicular to two 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 or 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 o fa deformed body’s return to it’s 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.