GChemOChem - Substitution, Addition, and Lab Techniques

Question 1

torque causes _____ acceleration

Answer 1

rotational

Question 2

t=FrSIN(angle)

Answer 2

F - force applied
r-distance from pivot to the FOrce
angle between r and the line of the force

Question 3

dynamic equilibrium is when an object is moving with _____

Answer 3

constant velocity

Question 3

Note that torque is zero if the forces acts through the _____ so that could be if r=0 pr angle=0 or 180

Answer 3

pivot point

Question 3

what is the angle to get the maximum possible torque with

Answer 3

90 degrees

Question 4

work moves ___ around. The unit is

Answer 4

energy. Joule (J)

Question 5

W=Fdcos(angle)

Answer 5

angle between force and distance

Question 6

practice cos and sin angles

Question 7

centripetal force does ___ work because it is always perpendicular

Answer 7

zero

Question 8

Kinetic energy=1/2mv(squared)

Answer 8

energy it has because it is moving

Question 9

Energy is the capacity to do __-

Answer 9

work

Question 10

Gravitational potential energy. Ep=mgh or U=mgh

Answer 10

height above the reference point

Question 11

Elastic potential energy is Fs=-k(change)x

Answer 11

This is Hooke’s Law

Question 12

Potential energy of a spring is Us=1/2k(change)xsquared

Question 13

electric potential energy. Opposites ___ and like charges __

Answer 13

attract, repel

Question 14

conservative forces do not change the total energy and they are potential energy the three are

Answer 14

gravity, elastic spring force, electric force

Question 15

Power is the rate at which work is done, the work (or energy) per ____

Answer 15

second

Question 16

Work and __ are synonymous

Answer 16

energy

Question 17

Power is scalar

Question 18

P=Fvcos(angle)

Question 19

P=W/t

Question 20

Powers is the ___ at which work or energy is done

Answer 20

rate

Question 21

thermally isolated means the system cannot exhange any __ with its surroundings

Answer 21

heat

Question 22

dynamic equilibrium is constant ____

Answer 22

velocity

Question 23

Pulley is Fout+NT

Answer 23

N is the number of times the rope pulls up on output

Question 24

Lever is MA=Lin/Lout

Answer 24

where l is length. We can either have a smaller force over a greater distance (arm). Or a greater force over a shorter distance (crowbar acting on a nail)

Question 25

Mechanical advantage is ___ divided by __

Answer 25

MA=out/in

Question 26

specific is divided my __

Answer 26

mass

Question 27

Machine uses a smaller force to do the same amount of ___

Answer 27

work

Question 28

Forces exerted by a person are non-conservative forces. The non conservative forces are any pushing or pulling applied force and friction. What are the conservative forces?

Answer 28

gravity, spring force, and electric force