Physics

Question 1

It is the product of the mass of an object and its velocity

Answer 1

Momentum

Question 2

The product of the force and the time during which the force acts on the body

Answer 2

Impulse

Question 3

It is a force that tends to produce rotation about an axis

Answer 3

Torque

Question 4

It causes the object to be accelerated towards the circle’s centet

Answer 4

Centripetal force

Question 5

Formula for speed and velocity

Answer 5

Speed: d/t
Velocity: đ/t

Question 6

Formula for ave acceleration

Answer 6

ā = change in velocity/ time of travel

Question 7

3 Laws of Motion and explain

Answer 7

1. Law of Inertia: A body will remain at rest unless acted upon by an outside force
2. Law of Acceleration: greater mass = more force
3. Law of Interaction: for every force, theres an equal and opposite reaction

Question 8

_____ done on an object is equal to the product of the magnitude of the force exerted on the ibject and the displacement that the object moves while the force is being exerted

Answer 8

Work

Question 9

Formula for work

Answer 9

W= Fd

Question 10

It is the capacity to do work

Answer 10

Energy

Question 11

Kinetic vs Potential energy

Answer 11

Kinetic: the energy of motion

Potential: at rest/stored

Question 12

Formula for Kimetic Energy

Answer 12

KE = ½ mv²

(v for velocity)

Question 13

What does the Law of Conservation of Energy states?

Answer 13

Energy is conserved. It can neither be created nor destroyed

Question 14

What is conduction

Answer 14

• heat transfer in a solid
• pass heat –one to another

Question 15

What is Convection?(2)

Answer 15

• heat transfwr in fluids
• replacing the cold air with hot air

Question 16

How does radiation occur?

Answer 16

In the absence of any medium. It can travel without the help of molecules of matter

Question 17

The process of changing the substance from its solid phase to its liquid phase

Answer 17

Fusion

Question 18

The process of changing a liquid to its vapor state

Answer 18

Vaporization

Question 19

A disturbance that travels through a medium

Answer 19

Wave

Question 20

Electromagnetic vs mechanical wave

Answer 20

Electromagnetic: does not require any medium

Mechanical: requires a medium

Question 21

The time it takes the wave to move from one crest to another

Answer 21

Period

Question 22

The number of cycles the wave completes in one second

Answer 22

Frequency

Question 23

The bouncing back of a wave when it hits a barrier that does not absorb the wave’s energy

Answer 23

Reflection

Question 24

The bending of light when it passes from one kind of material into another

Answer 24

Refraction

Question 25

Occur when 2 waves overlap

Answer 25

Interference

Question 26

The spreading of light waves as they pass through a small opening or around a boundary

Answer 26

Diffraction

Question 27

Describe sound (3)

Answer 27

- longitudinal compression wave - can move through all kinds of matter - echo: result of the reflection of sound

Question 28

It refers to the change in the frequency of a sound due to the motion of either the source or the observer

Answer 28

Doppler Effect

Question 29

It is made up of photons, or tiny packets of energy

Answer 29

Light

Question 30

Which has the longest wavelength in EM spectrum?

Answer 30

Red and radio wave

Question 31

Which has the shortest wavelength

Answer 31

Gamma Ray and violet

Question 32

Which has the highest frequency/ energy

Answer 32

Gamma ray and violet

Question 33

Which has the lowest frequency/energy in the EM spectrum?

Answer 33

Radio waves, red

Question 34

The EM Spectrum from shortest to longest wavelength

Answer 34

Gamma Ray, X Ray, Ultraviolet, Visible Light, Infrared, microwave, radio wave

Question 35

Which EM wave causes suntan and is used in processing plants to destroy germs?

Answer 35

Ultraviolet

Question 36

It is caused by the flow of electrons between atoms

Answer 36

Electricity

Question 37

Conductors vs insulators and give examples

Answer 37

Conductors: allow electrons to move freely (Eg. Copper, silver, aluminum) Insulators: slow down the flow of electrons (Eg. Air, rubber, plastic, wood, glass)

Question 38

It is the buildup of positive or negative charges on objects by accumulation or loss of electrons

Answer 38

Static electricity

Question 39

According to this law, the current passing through a conductor is directly proportional to the voltage across the conductor and inversely proportional to the resistance of the conductor

Answer 39

Ohm's Law

Question 40

Formula for Ohm's Law

Answer 40

V = IR

Question 41

Describe a series circuit (2)

Answer 41

- current is the same through each resistor - total resistance= add the resistance values

Question 42

Describe a parallel circuit

Answer 42

The voltage across each resistor in parallel is the same

Question 43

The rate at which work is done

Answer 43

Power