Energy Test

Question 1

The scalar product between two vectors

Answer 1

A • B = A • B • cosø

Question 2

What is work?

Answer 2

W = F • ∆d = F d cosø

total work is = F_net

Question 3

Conservative forces

Answer 3

• F_A
• F_K
• F_R

Question 4

Kinetic vs Potential energy

Answer 4

Kinetic energy; E_g = mgh

Potential energy; E_k = 1/2 mv²

Question 5

Mechanical Energy (E)

Answer 5

E = E_g + E_k

E = mgh + 1/2mv²

Question 6

isolated system

Answer 6

A system that does not experience:

• applied force
• friction
• air resistance (drag)

E = EK + EG = constant

∆E = 0

Question 7

non-isolated system

Answer 7

A system that DOES experience:

• F_A
• F_K
• F_R

∆E = W (work)

Question 8

equal to J?

Answer 8

[E] = [E_k] = [E_g] = [W] = 1J

Question 9

If Eg is constant

(non-isolated)

Answer 9

∆E_K = W

( ∆E_K + ∆E_g = W )

( ∆E_K + 0 = W )

( ∆E_K = W )

Question 10

If E_k is constant

(non-isolated)

Answer 10

∆E_g = W

( ∆E_g + ∆E_K = W )

( ∆E_g + 0 = W )

( ∆E_g = W )

Question 11

Power equation

Answer 11

P = ∆E / ∆t

or

(P =) J / s = W (att)

(power is a watt)

Question 12

Thermal energy

Answer 12

[TE] = J

Question 13

Kinetic Molecular Theory

Answer 13

• matter is made up of particles
• particles attract (N4)
• particles are in constant motion

Question 14

Thermal Energy is the total of what

Answer 14

kinetic energy + potential energy

Question 15

Temperature scales

Answer 15

• celsius
• fahrenheit
• kelvin (T_C +273.15)

0k is absolute zero

Question 16

Heat

Answer 16

heat is the change in T.E.

[Q] = 1J

Question 17

Specific Heat Capacity

Answer 17

C_w = J / kg • ˚C

Question 18

Heat equation

Answer 18

Q = mc ∆T

Q = mc (T₂ - T₁)

Question 19

Isolated heat system

Answer 19

Q_absorbed + Q_released = 0

Question 20

1 Watt

Answer 20

the power of energy transformation that converts 1J of energy into another form, in one second.

Question 21

1 Joule

Answer 21

the work done by 1N of force that produces a displacement of 1m

Question 22

Specific heat capacity def.

Answer 22

the amount of heat absorbed that is required for 1kg of a substance to increase its temperature by 1 ˚C

(J / kg • ˚C)