Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

Science 10 > Lesson 1 Energy & Power > Flashcards

Lesson 1 Energy & Power Flashcards

(55 cards)

Start Studying
1
Q

What is power in physics?

A

How quickly work is done. Amount of work done per unit time.

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

What formula represents power?

A

P = W/t

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

What is the unit of power?

A

Watts

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

Who is the unit ‘Watt’ named after?

A

Scottish inventor James Watt

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

What did James Watt invent?

A

The steam engine

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

How is power calculated?

A

Power is the quantity that describes how much work is done in a period of time.

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

What is the relationship between watts and joules?

A

1 watt = 1 J/s

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

How many watts are in one horsepower?

A

746 watts

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

If a force of 12N is applied at an angle of 25°, what formula is used to calculate work?

A

W = (F)(d)cos(θ)

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

Fill in the blank: Power is measured in _______.

A

Watts

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

True or False: Power can be defined as the amount of work done per unit time.

A

True

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

What does the symbol ‘P’ represent in the formula P = W/t?

A

Power

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

What is the direction of the force of kinetic friction?

A

The force of kinetic friction is in the direction opposite to d, O = 180°.

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

What is the final kinetic energy when the sled comes to rest?

A

The final kinetic energy is zero.

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

What is the work-kinetic energy theorem formula?

A

W_net = ΔKE = KE_initial - KE_final = -(1/2) mv².

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

What is mechanical energy?

A

Mechanical energy is the sum of kinetic energy and all forms of potential energy associated with an object or group of objects.

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

What is the formula for mechanical energy?

A

ME = KE + PE.

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

When is mechanical energy often conserved?

A

Mechanical energy is often conserved in the absence of friction.

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

What is the relationship between initial and final mechanical energy?

A

ME_initial = ME_final.

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

What is energy?

A

The ability to do work

Energy is a fundamental concept in physics that describes the capacity to perform work.

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

What do energy and matter together make up?

A

The universe

Matter is defined as substance, while energy acts as the mover of this substance.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

What is the Law of Conservation of Energy?

A

Energy cannot be created or destroyed; it may be transformed from one form into another, but the total amount of energy never changes.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

How do we sense energy?

Study These Flashcards
A

When the score changes, either through transformation from one form of energy to another or a transfer of energy from one point to another.

24
Q

Fill in the blank: Energy is nature’s way of keeping _______.

25
How is all energy divided?
All Energy is divided into: * Potential Energy * Kinetic Energy
26
What are the types of Potential Energy?
Types of Potential Energy include: * Gravitational Potential Energy * Elastic Potential Energy * Chemical Potential Energy
27
What is Potential Energy?
Energy that is stored and waiting to be used later
28
What is Kinetic Energy?
Energy of motion, the form capable of doing work
29
Give examples of Kinetic Energy
Examples of Kinetic Energy include: * Water behind a dam * Hammer overhead * Flowing water * A falling hammer * Electrons regenerating ATP in a biological cell
30
What is Gravitational Potential Energy?
Potential energy related to the position of an object in a gravitational field
31
What is Elastic Potential Energy?
Potential energy stored in elastic materials as the result of their stretching or compressing
32
What is Chemical Potential Energy?
Potential energy stored in the chemical bonds of molecules
33
What is Gravitational Potential Energy?
Potential energy stored in the gravitational fields of interacting bodies, depends on height from a zero level.
34
What is the formula for Gravitational Potential Energy?
PE = mgh m = mass (kg), h = height (m), g = acceleration due to gravity (9.8 m/s²)
35
What does the variable 'm' represent in the formula for Gravitational Potential Energy?
Mass (kg)
36
What does the variable 'h' represent in the formula for Gravitational Potential Energy?
Height (m)
37
What does the variable 'g' represent in the formula for Gravitational Potential Energy?
Acceleration due to gravity (9.8 m/s²)
38
What is Elastic Potential Energy?
Potential energy due to compression or expansion of an elastic object.
39
What is the formula for elastic potential energy?
PE = ½ kx² Where k is the force constant and x is the elongation or compression of the spring or rubber band.
40
What does the force constant (k) measure?
The stiffness of the spring or rubber band It indicates the force needed to produce a unit elongation of the spring or rubber band.
41
What is the formula for kinetic energy?
KE = ½ mv² Where m is the mass of the object and v is its velocity.
42
Define chemical potential energy.
Potential energy stored within the chemical bonds of an object.
43
Fill in the blank: The elastic potential energy of a spring or rubber band is given by _______.
PE = ½ kx²
44
True or False: Kinetic energy is the energy an object has due to its motion.
True
45
What does the Work-Kinetic Energy Theorem state?
The net work done by all the forces acting on an object is equal to the change in the object's kinetic energy.
46
What is the equation representing the Work-Kinetic Energy Theorem?
W_net = ΔKE
47
In the context of the Work-Kinetic Energy Theorem, what does W_net represent?
The net work done on a body
48
What is the relationship between net work and kinetic energy?
The net work done on a body equals its change in kinetic energy.
49
How is the kinetic energy of the hammer used in the Work-Kinetic Energy Theorem?
The kinetic energy of the hammer is used to do work on the nail by pushing it through the wooden rod.
50
If the force applied is F and the distance is Ad, what is the relationship expressed in the equation F * Ad = ΔKE?
The force applied times the distance equals the change in kinetic energy.
51
In the equation F * Ad = 0 - 2MUni, what does '0' represent?
The initial kinetic energy of the nail.
52
What is the final speed of the sled when it comes to rest?
0 m/s
53
What is the unknown variable in the sled example?
a (acceleration)
54
Fill in the blank: The net work done on a body equals its change in _______.
kinetic energy
55
True or False: The Work-Kinetic Energy Theorem can be applied to any object in motion.
True

Science 10 (1 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions