SCI 8

​SCI 8 Reviewer

By: Glyde Owen E. Manalo​

​Law of inertia or Newton's First Law of Motion

​Key Words:

A body at rest remains at rest or, if in motion, remains in motion at constant velocity unless acted on by a net external force.​

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A more massive object which has more inertia is more difficult to move at rest, slow down, speed up, or change its direction.​

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​Law of Acceleration or Newton's Second Law of Motion

​Key Words:

The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force.

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​Law of Action and Reaction or Newton's Third Law of Motion

​Key Words:

The action is always accompanied by a reaction force and two forces must always be equal and opposite

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To every action, there is always an equal but opposite reaction​

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Mass=Kg

Force=Fnet

Acceleration=m/s^2​

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​Fun fact: Breathing air is a jojo reference.

​Formula for finding force, mass, and acceleration

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Multiple Choice

What is the first law of motion

• Law of Motion

• Law of Acceleration

• Law of Inertia

• Law of Action and Reaction

Multiple Choice

What is the Second law of motion

• Law of Motion

• Law of Acceleration

• Law of Inertia

• Law of Action and Reaction

Multiple Choice

What is the Third law of motion

• Law of Motion

• Law of Acceleration

• Law of Inertia

• Law of Action and Reaction

Multiple Choice

Force=???

• Fnet

• Kg

• m/s^2

• G

Multiple Choice

Acceleration=???

• Fnet

• Kg

• m/s^2

• G

Multiple Choice

Which of the following vehicle below has greater inertia?

• Car

• Truck

• Bicycle

• Motorcycle

Multiple Choice

What causes the rolling ball to stop when there is no one to push it continuously

• Forces acting on the ball are already used up

• The forces acting on the ball were continuously increasing

• An unbalanced force causes the rolling ball to change its motion

• The gravitational force causes the rolling ball to change its motion

​Effects of Temperature to Speed of Sound

​Key Words:

Higher Temperature = Vibrate Quickly and thus​ travels fast

​Lower Temperature = Vibrate Slowly and thus​ travels slow

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Sound cant travel thru the medium

Sound travels the fastest at solid objects​

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Multiple Choice

An object that does not vibrate cannot produce what?

• Sound

• Heat

• Light

• Electricity

Multiple Choice

What happens to the sound an object makes when the speed of vibration slows down

• Its volume will increase

• its pitch rises

• its pitch becomes lower

• its volume decreases

Multiple Choice

Which of the following statements BEST explains why you can hear noises long distances at night

• There are fewer other noises at night

• Water conducts sound better at night

• Sound bounces off water better at night

• Sound waves are bent towards the cool air

​Hierarchy of Colors about the Energy of Visible Light

​Key Words:

ROYGBIV

Red = Refracted the least / Lowest Frequency / Lowest energy / Longest Wavelength

Orange

Yellow

Green

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Blue

Indigo

Violet​ = Refracted the most / Highest Frequency / Highest energy / Shortest Wavelength

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​Hierarchy of Colors about the Energy of Visible Light

​Key Words:

Radio --- Microwave --- Infrared --- Visible (Mid) --- Ultraviolet --- X-Ray --- Gamma Ray

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Long Wavelength <---------------------------------------------------------------------------->Short Wavelength

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​Long Frequency <---------------------------------------------------------------------------->High Frequency

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low Energy <---------------------------------------------------------------------------->High Energy

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Multiple Choice

Which of the following is True about the colors of light

• The shorter the wavelength, the lesser the energy

• The lower the wavelength, the lesser the refractive index

• The longer the wavelength, the greater the energy

• The Higher the wavelength, the lesser the refractive index

Multiple Choice

Which of the following is True about the colors of light

• The shorter the wavelength, the lesser the energy

• The lower the wavelength, the lesser the refractive index

• The longer the wavelength, the greater the energy

• The Higher the wavelength, the lesser the refractive index

Multiple Choice

What happens to the light particles when light hits an uneven surface

• They are reflected off in a straight line

• They are scattered in many directions

• They are absorbed by the surface

• They pass through the surface

Multiple Choice

As a ray of white light passes through a prism, dispersion occurs. Which among the color of visible spectrum refracted the most.

• Yellow

• Red

• Green

• Violet

Multiple Choice

Light is composed of different frequencies and wavelengths. Which among the colors of white light has the shortest wavelength and highest frequency

• Blue

• Indigo

• Violet

• Green

Multiple Choice

Which of the following wavelength order of visible light are from shortest to longest

• BIV G ROY

• GIV R YOB

• ROY G BIV

• VIB G YOR

​Heat vs. Temperature

​Key Words:

Heat transfers​ from an object of high temperature to an object with low temperature

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Temperature is measured in degrees

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Heat is measured from joules

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The Second Law of Thermodynamics states that heat will always flow spontaneously from hotter substance to colder ones​

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V=Voltage

​I=Amperes

​R=Resistance

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​Volts=V

Amperes=A

Resistance=Ω

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​F

​Formula for finding voltage, resistance, and amperes

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Multiple Choice

What happens to the current as the resistance increases?

• Current decreases as the resistance increases

• Current increases as the resistance increases

• Current decreases as the resistance increases

• Current increases as the resistance decreases

Multiple Choice

Which of the following formula CORRECTLY represents the relationship of current, voltage, and resistance?

• V=IR

• I=V/R

• V=I/R

• R=V/I

Multiple Choice

How much voltage would be necessary to generate 10amps of current in a circuit that has 5 ohms of resistance

• 2V

• 0.5V

• 50V

• 4.9V

Multiple Choice

How many amps of current flow through a circuit that includes a 27 v battery and a bulb with a resistance of 3 ohms

• 9 Amp

• 18 Amp

• 81 Amp

• 0.11 Amp

Multiple Choice

Three LED lamps are connected in parallel across 220 volt source. if one lamp burns out,_____

• The remaining two will not glow

• The remaining two will glow brighter

• The remaining two will glow dimmer

• The remaining two will also burn out

Multiple Choice

Which connection below will make the bulbs grow brighter

• Two bulbs and one dry cell in a series connection

• Two bulbs and one dry cell in a parallel connection

• Two bulbs and two dry cells in a series connection

• Two bulbs and two dry cells in a parallel connection

Multiple Choice

• Series

• Alternate

• Simple

• Parallel

Multiple Choice

• Alternate

• Series

• Simple

• Parallel

​Gravitational potential energy

​Formula

GPE=M×​G×H

M=Mass

G=Gravity

H=Height​

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​​Review

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