Science

Question 1

What is friction?

Answer 1

Friction is the resistance that one surface or object encounters when moving over another.

Question 2

True or False: Friction always acts in the direction of motion.

Answer 2

False

Question 3

What are the two main types of friction?

Answer 3

Static friction and kinetic (or dynamic) friction.

Question 4

Fill in the blank: The force of friction depends on the _____ of the surfaces in contact.

Answer 4

nature

Question 5

What is static friction?

Answer 5

Static friction is the friction that exists between a stationary object and the surface it’s on.

Question 6

What is kinetic friction?

Answer 6

Kinetic friction is the frictional force acting between moving surfaces.

Question 7

True or False: Kinetic friction is usually less than static friction.

Answer 7

True

Question 8

What is the coefficient of friction?

Answer 8

The coefficient of friction is a numerical value that represents the frictional force between two bodies.

Question 9

Fill in the blank: The coefficient of static friction is usually _____ than the coefficient of kinetic friction.

Answer 9

greater

Question 10

What factors affect friction?

Answer 10

Surface texture, normal force, and the materials of the surfaces in contact.

Question 11

How is the frictional force calculated?

Answer 11

Frictional force is calculated by multiplying the coefficient of friction by the normal force.

Question 12

What role does lubrication play in friction?

Answer 12

Lubrication reduces friction by creating a barrier between surfaces.

Question 13

True or False: Friction can generate heat.

Answer 13

True

Question 14

What is rolling friction?

Answer 14

Rolling friction is the resistance encountered when an object rolls over a surface.

Question 15

Which type of friction is generally the lowest: static, kinetic, or rolling?

Answer 15

Rolling friction.

Question 16

Fill in the blank: Friction can be both _____ and _____ depending on the context.

Answer 16

beneficial, detrimental

Question 17

What is the main disadvantage of friction?

Answer 17

It can cause wear and tear on materials and generate heat.

Question 18

True or False: Increasing the surface area in contact always increases friction.

Answer 18

False

Question 19

What is the purpose of friction in everyday life?

Answer 19

Friction allows us to walk, drive, and hold objects without slipping.

Question 20

What is air resistance?

Answer 20

Air resistance is a type of friction that acts against objects moving through the air.

Question 21

Fill in the blank: The direction of the frictional force is always _____ to the direction of motion.

Answer 21

opposite

Question 22

What is the difference between dry and fluid friction?

Answer 22

Dry friction occurs between solid surfaces, while fluid friction occurs between a solid and a liquid or gas.

Question 23

What happens to friction when surfaces are lubricated?

Answer 23

Friction decreases.

Question 24

What does the term ‘slip’ refer to in the context of friction?

Answer 24

Slip refers to the relative motion between two surfaces in contact when static friction is overcome.

Question 25

True or False: Friction is always a negative force.

Answer 25

False

Question 26

What is boundary lubrication?

Answer 26

Boundary lubrication occurs when a thin film of lubricant separates two surfaces in contact.

Question 27

What is the primary cause of earthquakes?

Answer 27

The movement of tectonic plates.

Question 28

True or False: Tornadoes can only form over land.

Answer 28

True.

Question 29

Fill in the blank: The process by which water vapor turns into liquid water is called __________.

Answer 29

condensation.

Question 30

What scale is commonly used to measure the intensity of earthquakes?

Answer 30

The Richter scale.

Question 31

Which natural phenomenon is characterized by a rotating column of air extending from a thunderstorm to the ground?

Answer 31

A tornado.

Question 32

Multiple Choice: Which of the following is NOT a type of precipitation? A) Rain B) Snow C) Hail D) Wind

Answer 32

D) Wind.

Question 33

What is the term for a large ocean wave caused by underwater earthquakes or volcanic eruptions?

Answer 33

Tsunami.

Question 34

True or False: Hurricanes are classified by their wind speed.

Answer 34

True.

Question 35

Fill in the blank: The __________ is the layer of the Earth where tectonic plates float.

Answer 35

asthenosphere.

Question 36

What phenomenon occurs when the sun is obscured by the moon?

Answer 36

A solar eclipse.

Question 37

Multiple Choice: Which of the following is a greenhouse gas? A) Oxygen B) Carbon Dioxide C) Nitrogen D) Hydrogen

Answer 37

B) Carbon Dioxide.

Question 38

What is the term for the gradual increase in Earth's average temperature due to human activities?

Answer 38

Global warming.

Question 39

True or False: Lightning can strike the same place multiple times.

Answer 39

True.

Question 40

Fill in the blank: The __________ effect describes how the Earth's atmosphere traps heat.

Answer 40

greenhouse.

Question 41

What is the main driver of ocean currents?

Answer 41

Wind and the Earth's rotation.

Question 42

Multiple Choice: Which layer of the atmosphere contains the ozone layer? A) Troposphere B) Stratosphere C) Mesosphere D) Thermosphere

Answer 42

B) Stratosphere.

Question 43

What phenomenon is described as the sudden release of energy in the Earth's crust?

Answer 43

An earthquake.

Question 44

True or False: All volcanic eruptions are explosive.

Answer 44

False.

Question 45

Fill in the blank: A __________ is a large-scale weather pattern that can cause prolonged periods of rain or drought.

Answer 45

climate.

Question 46

What is the term for the boundary between two tectonic plates?

Answer 46

Fault line.

Question 47

Multiple Choice: Which natural disaster is measured using the Saffir-Simpson scale? A) Earthquake B) Hurricane C) Flood D) Tornado

Answer 47

B) Hurricane.

Question 48

What is the phenomenon where water vapor in the atmosphere condenses into clouds?

Answer 48

Cloud formation.

Question 49

True or False: The Coriolis effect influences wind patterns on Earth.

Answer 49

True.

Question 50

Fill in the blank: The area of land that drains into a river is called its __________.

Answer 50

watershed.

Question 51

What is the primary factor that influences climate in a region?

Answer 51

Latitude.

Question 52

Multiple Choice: Which of the following is a type of severe weather? A) Fog B) Snow C) Blizzard D) Drizzle

Answer 52

C) Blizzard.

Question 53

What is the phenomenon of air rising and cooling, leading to cloud formation and precipitation?

Answer 53

Convection.