Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Intro To Physical science > Physics Unit > Flashcards

Physics Unit Flashcards

You may prefer our related Brainscape-certified flashcards:
Biology 101 flashcards
1
Q

How fast is the plane moving in respect to the ground?

A

Wind head on to plane- you subtract

Plane going forward, wind going to the right- a2+ b2= c2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What happens when acceleration is zero?

A

State of mechanical equilibrium

All forces acting on the object are canceled out

Zero acceleration does not mean zero velocity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is Newton’s first law?

A

Every material object continues in its state of rest, or of uniform motion in a straight line, unless it is compelled to change that state by a force impressed upon it

Law of inertia
Kicking a stand still ball

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is the free fall formula?

A

Acceleration due to the gravity formula

D=1/2gt2

Gravity= 9.8ms2 or 32ft/s2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is a vector?

A

An arrow representing velocity

Length= speed of object
Direction= direction of motion
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is velocity?

A

Speed plus direction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is mass?

A

Measure of the quantity of matter

1KG= 9.8 Newton’s

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is Newton’s 3rd law?

A

Whenever an object exerts a force on a second object, the second object exerts and equal and opposite force on the first

Action- reaction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is inertia?

A

The tendency of things to resist changes in motion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is a force?

A

A push or pull

Gravitational, electrical, magnetic, muscle effort

A force is anything that accelerated an object

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

How do you find the acceleration?

A

Change in velocity divided by the change in time

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is Speed?

Types of Speed?

A

Distance traveled divided by the time elapsed. S=D/T

Instantaneous Speed: speed at any specific instance. Speedometer

Average Speed: total distance covered divided by time elapsed
Avg. Speed= total distance/ total time

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is Newton’s 2nd Law?

A

The acceleration of an object is directly proportional to the net force acting on the object and inversely proportional to its mass

A=F/M

More force= more acceleration

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Objects free falling— what happens?

A

F=MA so A=F/M

A more massive object will have a greater attraction to the earth but because of inertia will speed up slower

A less massive object will have a smaller attraction to the earth but will speed up faster

Both will hit the ground at the same time

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Who founded the law of gravitation?

How did that happen?

A

Issac Newton

Apple fell from tree, initial calculations didn’t work, places theory in drawer for 20 years, when comet of 1670 came Halley convinced him to relook at it, produced the law of gravitation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is the formula for the Law is Universal Gravitation?

A

F~ m1m2/ d2

F= Gx m1m2/ d2

G= 6.67 x 10-11 N m2/kg2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Universal Gravitation constant?

A

G= 6.67 x 10-11 Nm2/kg2

Equals the force of attraction between two 1KG masses 1 meter apart

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What are Spring Tides?

A

Higher than average tides and lower than average tides

Are when the sun, moon, and earth are lined up

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What is a Neap Tides?

A

High tides lower than average, and low tides higher than average

When the moon is half way been a new moon and a full moon

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

In projectile motion, what equation do you use for horizontal movement?

A

d= v x t

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

In projectile motion, what equation do you use for vertical problems?

A

d=1/2gt2 and A=V/T

22
Q

What is Trajectory?

A

Up to 45 degree angle- greater distance at greater angle

After 45 degree- greater height, less distance

45 degree gives the greatest distance

Any two angles that add to 90 degrees will hit the same place

23
Q

Steps in the Scientific Method?

A
  1. Observation
  2. Hypothesis
  3. Experiment
  4. Theory
24
Q

What happens when a parachutist reaches terminal speed?

A

Acceleration terminates- it no longer occurs

25
Q

What is the inverse square law?

A

A law relating to the intensity of an effect to the inverse square of the distance from the cause.

Examples: gravity, electric, magnetic, light, sound, and radios phenomena

26
Q

What is the first law of thermodynamics?

A

Whenever heat flows into or out of a system, the gain or loss of thermal energy equals the amount of heat transferred.

27
Q

What is the second law of thermodynamics?

A

Heat n vet spontaneously flows from a cold substance to a hot substance.

28
Q

What is the third law of thermodynamics?

A

No system can reach absolute zero.

29
Q

What is absolute zero?

A

The theoretical temp at which a substance possesses no thermal energy

30
Q

Three different heat transfers?

A

Conduction- transfer of thermal energy by molecular and electronic collisions (especially solids)

Convection- trans thermal energy by gas or liquid

Radiation- trans energy by electromagnetic waves

31
Q

What is the escape speed?

A

11.2 kilometers per second

Leave earth and never stop due to gravity

32
Q

What is orbital velocity?

A

The minimum velocity required to place or maintain a satellite in a given orbit.

33
Q

What is the earths orbital speed around in the sun?

What type of orbit does the earth have with the sun?

A

70,000 mph

Elliptical, all other planets have circular

34
Q

Why are tides formed?

A

Pulls on the moon, stretch the earth producing bulges, earth spins over the bulges producing two high and two low tides per day

35
Q

Define:
Voltage

Current

Resistance

A

Voltage: the amount of potential energy between two points on a circuit

Current: the rate at which charge is flowing

Resistance: a materials tendency to resist the flow of charge (current)

36
Q

What is the difference between a series and a parallel circuit?

What has more resistance?

A

Parallel have multiple branching pathways for electrical current, series has a single path.

Series- cause it is equal to the sum of the resistors

37
Q

What is electromagnetic induction?

A

The induction of voltage when a magnetic field changes with time

38
Q

Parts of a wave and what do they do?

A

Wavelength- the distance between two successive crests of a wave

Amplitude- the maximum extent of a vibration

Frequency- the number of vibrations per unit time

39
Q

What is reflection of sound?

A

When sound travels in a given medium, it strikes the surface of another medium and bounces back in some other direction

40
Q

What is refraction of sound?

A

Sound waves pass through a medium with gradually varying properties.

Example: sound waves refract when traveling over water

41
Q

What is sound resonance?

A

When the frequency of forced vibrations on any object matches the objects natural frequency, a dramatic increase in amplitude occurs

42
Q

What is the Doppler effect?

A

An increase (or decrease) in the frequency of sound as the source and observer move toward (or away from) each other.

43
Q

What is light?

A

Wave particle duality

Acts like a particle and a wave

44
Q

What is the electromagnetic spectrum?

A

The range of wavelengths or frequencies over which electromagnetic radiation extends

45
Q

How does light travel through something?

A

The phase lag must be small to be transparent. Opaque materials don’t allow light waves to come through, not enough phase lag

46
Q

What is light polarization?

A

Unpolarized light- a light wave that is vibrating in one or more planes

Polarized light- a light wave that vibrates in a single plane

  • the process of changing unpolarized light to polarized light is: polarization
47
Q

Why do objects have different colors?

A

Because the absorb some colors (wavelengths) and reflect or transmit others. The colors we see are the wavelengths that are reflected or transmitted.

48
Q

Why is the sky blue?

Why are sunsets red?

A

Blue light gets scattered in all directions by earths atmosphere. Blue gets scattered more due to having smaller and shorter waves.

Shorter wavelengths (blue) are scattered away while longer wavelengths (red) are reaching the observer

49
Q

Why are clouds white?

A

The light through the sun is passing through them without blockage.

50
Q

What is light diffraction?

A

The slight bending of light as if passes around the edge of an object

51
Q

What is light interference?

A

When two waves get on top of each other to form a resultant wave of greater, lower, or same amplitude.

Intro To Physical science (1 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions