Unit Four Exam Flashcards Preview

Block Science > Unit Four Exam > Flashcards

Flashcards in Unit Four Exam Deck (60):
1

What is work and it's units

Energy used to move a distance, measured in joules

2

What is the formula for work

Force X distance

3

What things will affect the amount of work done

Force and distance

4

What is power and it's units

Rate at which work is done, how fast
Measured in watts

5

What is the formulas for power

Force X d/ t
W/t

6

What are the different forms of energy

Kinetic and potential

7

What are examples of kinetic and potential energy

Kinetic: Heat, light, sound, mechanical
Potential: chemical, nuclear

8

What is the law of conservation of energy

Energy can't be created or destroyed only converted into one form or another

9

What type of energy transformation is a boy eating an apple then walking to work

Chemical to mechanical

10

What type of energy transformation is gasoline in your car used to drive

Chemical to mechanical

11

What type of energy transformation is turning on a light

Electric to light

12

What type of energy transformation is hair dryer being turned on

Electric to heat

13

If two people collide how does the amount of energy before the collision compare to after and what law is this

It is the same and it is the law of conservation of energy

14

Why is the amount of potential energy at the top of a roller coaster I'll is not the same as kinetic energy at the bottom of the hill

The energy at the bottom is slightly less because some was converted to hear by friction

15

What is kinetic energy, and units

Energy of motion and it is measured in joules

16

Formula for kinetic energy

KE= 1/2m v(2)

17

What is potential energy, what is it measured in

Stored energy. Joules

18

What is the formula for potential energy

P= w * h
P= h X m X g

19

What is a medium and give three examples

The material that gets disturbed, through which a wave travels
Air, water, steel

20

Electromagnetic waves are fastest in what medium

Vacuum, no medium

21

What type of wave is a sound wave

Longitudinal

22

What type of wave is a light wave

Electromagnetic transversal

23

What type of waves are electromagnetic waves

Transverse waves, disrupt the electrical and magnetic field, radio, heat waves, visible, uv, X-Ray, gamma

24

What is the formula for wave speed,

V= f X wl

25

What is the formula for wavelength

Wl= v/f

26

What is the formula for frequency

F = v/wl

27

What are the units for frequency, wavelength, and wave speed

Frequency= hz
Wavelength= m
Wave speed= m/s

28

What is it called when a wave bends as it goes from one medium to another

Refraction

29

List the energies of the electromagnetic spectrum in order from longest to shortest wavelength

Radio, tv, micro, infared, visible, ultraviolet, X-Ray, gamma

30

What is period

Period is how fast it takes for one wave to pass in seconds

31

What is frequency

Frequency is how many waves pass per second

32

What is the formula for frequency

1/p

33

What is the formula for period

1/f

34

What type of wave travels fastest in solids

Longitudinal

35

In music the term pitch is what

Frequency

36

What types of EM radiation are used to fight cancer

Gamma

37

What are ultrasounds used for and what type of waves do they use

Ultrasonic and to see babies and internal organs

38

What type of wave is harmful to our skin but also beneficial in small amounts

Ultraviolet, can cause burns or skin cancer but also gives us vitamin d

39

What is the Doppler effect

Change in frequency due to motion

40

Will sound intensity increase or decrease as you move closer to the noise

Increase

41

What is an echo

Reflection of sound wave odd a smooth surface

42

What is reflection

Waves bouncing off flat, smooth surface

43

Why do we hear thunder after the lightning flash

Sound is slower than light

44

Why is the sky blue

Small molecules scatter blue and violet light around up in the atmosphere. We don't see violet very well so it looks blue

45

Why are sunsets red

At sunset light travels through so much atmosphere to reach your eye that by the time it gets there all the blue has been scattered and only longer wave lengths get through.

46

What is current

Flow, more current= faster electrons

47

What is voltage

Electrical pressure ( how much energy each electron has) created by difference in electron pressure

48

What is resistance and give an example of a resistor

Opposition to the flow of electrons, an example is an insulator, wore thin or long

49

What is static electricity

Non flowing electrons

50

What is electric current

Flow of electron

51

What is coloumbs law

The force between the charges particles is directly proportional to amount of charge and inversely proportional to distance squared

52

What is coloumbs law formula


K= Q X Q
----------
D(2)

53

What does coloumbs law say about distance and strength of attractions between chargers

If the amount of charge on two particles doubled then force between them is twice as much, if the distance between two particles is doubled the force between them is 1/4 of what it was before

54

What happens to the strength of attraction between two charged particles if the distance is doubled

The force between them is 1/4 of what it was before

55

What if distance is cut in half

Then the force is four times as much

56

What if the strength of one charge doubles

Then the force is doubled

57

What if strength of both charges doubles

The force between them is quadrupled

58

What is a series

When it's one loop, only one path, If light is taken out then it doesn't work

59

What is a parallel

More than one path, If a light is taken out the others still light

60

What is energy

The ability to do work