ch.12 pt 1

Question 1

newton’s 1st law

Answer 1

law of inertia; a body will maintain a state of rest or constant velocity unless acted on by an external forces that changes the state

Question 2

newtons 2nd law

Answer 2

law of acceleration; a force applied to a body causes an acceleration of that body

Question 3

newtons 3rd law

Answer 3

law of reaction; for every action, there is an equal and opposite reaction

Question 4

inertia

Answer 4

the tendency to resist change in state of motion; directly proportional to mass and has no units of measurement

Question 5

conservation of energy

Answer 5

energy can neither be created nor destroyed, it can be transformed from one state to another, or transferred into or out of the system. but total amount of energy never changes

Question 6

what is the formula for the conservation of energy?

Answer 6

PE + KE = C

Question 7

identify the factors that govern the magnitude of the force of maximum static friction or kinetic friction in any situation

Answer 7

the coefficient of friction

Question 8

identify the factors that influence the value of the coefficient of friction

Answer 8

1.) the relative roughness and hardness of surfaces in contact
2.) the type of molecular interaction between surfaces

Question 9

what is the product of force and time?

Answer 9

impulse

Question 10

the __ describes the relative elasticity of an impact

Answer 10

…

Question 11

Newton’s __ __ __ may be restated as the principle of conservation of momentum

Answer 11

law of inertia

Question 12

the coefficient of kinetic friction

Answer 12

the magnitude of the kinetic friction force

Question 13

the coefficient of static friction

Answer 13

the magnitude of the maximum static friction

Question 14

in mechanics, __ refers to the amount of mechanical work performed in a given time

Answer 14

power

Question 15

the principle of work and energy is represented as __

Answer 15

W = ΔKE + ΔPE + ΔTE

Question 16

when the magnitude of force applied on a stationary body becomes greater and greater, the magnitude of the opposing friction force also increases to a certain critical point. At that point, the friction force presented is termed __

Answer 16

maximum static friction

Question 17

the formula for mechanical work is the product of?

Answer 17

force and displacement

Question 18

what are the 2 variables that determine an objects/bodys momentum

Answer 18

velocity and mass

Question 19

the amount of horizontal force required to START MOVING an object resting on a horizontal surface…

Answer 19

the force must be greater than the maximum static friction force

Question 20

the capacity for doing work that a body possesses because of its HEIGHT or POSITION

Answer 20

potential energy

Question 21

a skater gliding on ice will continue to move in the same direction with the same speed (in absence of the action of additional forces). This situation exemplifies which law?

Answer 21

Newton’s law of Inertia

Question 22

what is the correct unit of mechanical work or energy?

Answer 22

joules

Question 23

an impact resulting in TOTAL LOSS of velocity would be a perfectly __ impact

Answer 23

plastic

Question 24

a number that serves as an index of elasticity for colliding bodies is called the coefficient of __

Answer 24

restitution

Question 25

what is the product of a force and the time during which it acts?

Answer 25

impulse

Question 26

what is the product of a force and the time during which it acts?

Answer 26

impulse