M3 Energy

Question 1

How do you convert speed from km/h to m/s?

Answer 1

Divide By 3.6

Question 2

What are the two main types of energy?

Answer 2

Potential energy and kinetic energy

Question 3

What is potential energy?

Answer 3

The energy stored in an object due to its position or configuration

Question 4

What is the formula for potential energy?

Answer 4

PE = mgh

Question 5

What does each letter in the formula PE = mgh stand for?

Answer 5

• PE: Potential Energy
• m: Mass
• g: Acceleration due to gravity
• h: Height

Question 6

What is kinetic energy?

Answer 6

The energy of an object due to its motion

Question 7

What is the formula for kinetic energy?

Answer 7

KE = 1/2 mv^2

Question 8

What does each letter in the formula KE = 1/2 mv^2 stand for?

Answer 8

• KE: Kinetic Energy
• m: Mass
• v: Velocity

Question 9

What happens to potential energy when something falls?

Answer 9

It decreases as kinetic energy increases

Question 10

What happens to kinetic energy when something speeds up?

Answer 10

It increases

Question 11

How are potential energy and kinetic energy related?

Answer 11

They can convert into each other; as one increases, the other decreases

Question 12

What is an example of potential energy changing into kinetic energy?

Answer 12

A falling object

Question 13

What is the law of conservation of energy?

Answer 13

Energy cannot be created or destroyed, only transformed

Question 14

What is the formula for work using energy?

Answer 14

Work = Energy transferred

Question 15

What does it mean if work is positive?

Answer 15

Energy is added to the system

Question 16

What does it mean if work is negative?

Answer 16

Energy is removed from the system

Question 17

How do you convert speed from m/s to km/h?

Answer 17

Multiply by 3.6

Question 18

What is the value of gravity used in energy calculations on Earth?

Answer 18

10 m/s²

Question 20

What is work in physics?

Answer 20

The energy transferred by a force

Work is defined as the transfer of energy resulting from a force acting over a distance.

Question 21

What conditions must be met for work to occur?

Answer 21

A force must move an object over a distance

Work requires both a force and movement of an object.

Question 22

What type of work is done when force and movement are in the same direction?

Answer 22

Positive work

Positive work occurs when the force applied and the direction of movement align.

Question 23

What type of work is done when the force is in the opposite direction of movement?

Answer 23

Negative work

Negative work occurs when force opposes the direction of movement, such as friction.

Question 24

In what unit is work measured?

Answer 24

Joules (J)

Joules are the standard unit of measurement for work in the International System of Units (SI).

Question 25

What is the formula for calculating work?

Answer 25

Work (W) = Force (F) × Distance (s) ## Footnote This formula relates work to the force applied and the distance over which it acts.

Question 26

What does 'W' represent in the work formula?

Answer 26

Work in joules ## Footnote 'W' is the variable used to denote work in the formula.

Question 27

What does 'F' represent in the work formula?

Answer 27

Force in newtons ## Footnote 'F' is the variable used to denote the force applied in the calculation of work.

Question 28

What does 's' represent in the work formula?

Answer 28

Distance in metres ## Footnote 's' is the variable used to denote the distance over which the force is applied.