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Class 5 Finals Practice > Science L 10 > Flashcards

Science L 10 Flashcards

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1
Q

What is an inclined plane?

A

A ramp where one end is higher than the other, allowing objects to be moved between different heights.

Example: A slide that children play on.

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2
Q

Define a screw.

A

A twisted, slender metal pin used to join things by rotating it through materials in a circular motion.

Screws are commonly used in drills.

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3
Q

What is a wedge?

A

A simple machine made of two inclined planes joined together, used to cut objects apart or secure things.

Examples include a shovel, knife, axe, and needle.

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4
Q

Define force.

A

A push or pull applied on an object.

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5
Q

What is gravitational force?

A

The force with which an object pulls another object.

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6
Q

Define frictional force.

A

The force that works in the opposite direction of the motion of a body.

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7
Q

What is energy?

A

The ability of a body to do work.

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8
Q

Define effort in the context of levers.

A

The force that a user applies on the lever.

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9
Q

What is renewable energy?

A

Energy obtained from sources like the Sun, water, and wind that can be reused.

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10
Q

Define non-renewable energy.

A

Energy obtained from sources like coal and petrol that cannot be reused.

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11
Q

What is load in mechanics?

A

The weight of the body on which work is to be done.

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12
Q

Define a lever.

A

A simple machine with a long rod resting on a fulcrum, used for lifting objects.

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13
Q

What is a fulcrum?

A

The fixed point about which the lever moves freely to perform work.

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14
Q
A
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15
Q

What is mechanical energy?

A

The energy possessed by bodies due to their motion (kinetic energy) or position (potential energy).

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16
Q

What is electrical energy?

A

Energy that comes from electric power plants and is used to run electrical appliances at homes, offices, industries, and more.

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17
Q

What provides electrical energy to our homes?

A

Electrical wires, plug sockets, and switches.

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18
Q

What is the major source of heat energy on Earth?

A

The Sun.

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19
Q

How is heat energy released besides solar energy?

A

When we burn fuels like wood, coal, petrol, or from electrical appliances like electric heaters.

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20
Q

What is light energy?

A

The energy that enables us to see things.

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21
Q

List some sources of light energy.

A
  • Bulb tube light
  • LED
  • Stars
  • Candles
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22
Q

What is wind energy?

A

Energy obtained from moving air or wind.

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23
Q

How is wind energy primarily used?

A

To generate electricity by installing windmills.

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24
Q

What is solar energy?

A

The energy from the Sun, which is the most readily available source of energy.

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25
How is solar energy used?
It is used in solar cookers and solar cells.
26
What is hydro energy?
Energy obtained from moving water.
27
How was hydro energy used in the past?
People used water mills to grind grains.
28
What are the two types of energy?
* Renewable energy * Non-renewable energy
29
Define renewable energy.
Energy that can be used again and again and is obtained from sources like the Sun, wind, and water.
30
What is non-renewable energy?
Energy that cannot be used again and again and comes from limited sources.
31
Give examples of non-renewable energy sources.
* Coal * Petrol
32
Why is it important to use non-renewable energy sources judiciously?
Because these sources are limited and may become extinct soon.
33
What is energy defined as?
The ability to do work.
34
What energy is used in windmills to generate electricity?
Wind energy.
35
Where do we get hydro energy from?
Moving water.
36
Solar cells work on _______.
[solar energy]
37
What are simple machines?
Machines that make our work easier and faster as they use less effort for more work.
38
How many types of simple machines are there?
Six.
39
List the types of simple machines.
* Lever * Inclined plane * Pulley * Wheel and axle * Wedge * Screw
40
What is mechanical energy?
The energy possessed by bodies due to their motion (kinetic energy) or position (potential energy).
41
What is electrical energy?
Energy that comes from electric power plants and is used to run electrical appliances at homes, offices, industries, and more.
42
What provides electrical energy to our homes?
Electrical wires, plug sockets, and switches.
43
What is the major source of heat energy on Earth?
The Sun.
44
How is heat energy released besides solar energy?
When we burn fuels like wood, coal, petrol, or from electrical appliances like electric heaters.
45
What is light energy?
The energy that enables us to see things.
46
List some sources of light energy.
* Bulb tube light * LED * Stars * Candles
47
What is wind energy?
Energy obtained from moving air or wind.
48
How is wind energy primarily used?
To generate electricity by installing windmills.
49
What is solar energy?
The energy from the Sun, which is the most readily available source of energy.
50
How is solar energy used?
It is used in solar cookers and solar cells.
51
What is hydro energy?
Energy obtained from moving water.
52
How was hydro energy used in the past?
People used water mills to grind grains.
53
What are the two types of energy?
* Renewable energy * Non-renewable energy
54
Define renewable energy.
Energy that can be used again and again and is obtained from sources like the Sun, wind, and water.
55
What is non-renewable energy?
Energy that cannot be used again and again and comes from limited sources.
56
Give examples of non-renewable energy sources.
* Coal * Petrol
57
Why is it important to use non-renewable energy sources judiciously?
Because these sources are limited and may become extinct soon.
58
What is energy defined as?
The ability to do work.
59
What energy is used in windmills to generate electricity?
Wind energy.
60
Where do we get hydro energy from?
Moving water.
61
Solar cells work on _______.
[solar energy]
62
What are simple machines?
Machines that make our work easier and faster as they use less effort for more work.
63
How many types of simple machines are there?
Six.
64
List the types of simple machines.
* Lever * Inclined plane * Pulley * Wheel and axle * Wedge * Screw
65
66
67
68
What is a lever?
A lever is a long bar that rotates on a fixed point which lifts or moves loads. ## Footnote Levers are commonly found in everyday items like door handles and crowbars.
69
What are the three main components of a lever?
* Effort (E) * Load (L) * Fulcrum (F) ## Footnote Each component plays a crucial role in the functioning of a lever.
70
What is the definition of 'Effort' in the context of levers?
Effort (E) is the force that a user applies on the lever.
71
What does 'Load' refer to in a lever system?
Load (L) is the weight of the body on which the work is to be done.
72
Define 'Fulcrum' in relation to levers.
Fulcrum (F) is the fixed point about which the lever moves freely to do the work.
73
What is a Class 1 lever?
In a Class 1 lever, the fulcrum is positioned between the load and the effort. ## Footnote Examples include seesaws, scissors, pliers, crowbars, and catapults.
74
What are some examples of Class 1 levers?
* Seesaw * Scissors * Pliers * Crowbar * Catapult
75
What is a Class 2 lever?
In a Class 2 lever, the load is placed between the fulcrum and the effort. ## Footnote Common examples include wheelbarrows, nutcrackers, staplers, and bottle openers.
76
List some examples of Class 2 levers.
* Wheelbarrow * Nutcracker * Stapler * Bottle opener
77
What defines a Class 3 lever?
In a Class 3 lever, the effort is applied between the load and the fulcrum. ## Footnote Examples include fishing rods and tweezers.
78
What is the purpose of a wheel and axle?
A wheel and axle is a simple machine that allows the wheel to turn, facilitating movement. ## Footnote Examples include bicycles and revolving doors.
79
Describe a pulley.
A pulley is similar to a wheel and axle and is provided with a rope or chain to move things up and down or back and forth.
80
What is a fixed pulley?
A fixed pulley remains fixed to a position and does not reduce or increase the force applied; it only changes the direction of the force.
81
Give an example of a fixed pulley.
An example of a fixed pulley is a flagpole.
82
What is a movable pulley?
A movable pulley is a pulley that moves with the load and is used to lift heavy loads more easily.
83
When would you use a movable pulley?
Movable pulleys are used when lifting very heavy loads, such as a car or cargo.

Class 5 Finals Practice (2 decks)

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