Energy

Question 1

What are four types of energy?

Answer 1

Gravitational
Gravitational potential energy
Kinetic energy
Mechanical energy

Question 2

What is energy?

Answer 2

The capacity to perform an action

Question 3

What is the base unit for energy?

Answer 3

The Joule

J

Question 4

What does gravity cause the earth to do?

Answer 4

Exert a force of attraction on objects on or near the earth

Question 5

What is weight?

Answer 5

The gravitational force of attraction that the earth has on an object

Question 6

What is the relationship between weight and distance from the earth?

Answer 6

As the distance of an object from the earth increases, the attractive force is weaker, so weight decreases

Question 7

What is weight measured in?

Answer 7

Newton

Question 8

What is the value of acceleration due to gravity?

Answer 8

9,8 m/s^2

Question 9

What is the symbol for acceleration due to gravity?

Answer 9

g

Question 10

What is the formula for calculating weight?

Answer 10

Weight is equal to mass times acceleration

w=mg

Question 11

What is potential energy?

Answer 11

Energy that an object has by virtue of its position

Question 12

What is gravitational potential energy?

Answer 12

Energy that an object has because of its potential to fall to the earth

Question 13

What is the symbol for gravitational potential energy?

Answer 13

Ep

Question 14

What is the relationship between height and gravitational potential energy?

Answer 14

The higher the object is positioned above a reference point, the greater its gravitational potential energy

Question 15

What is the formula for gravitational potential energy?

Answer 15

Ep=mgh

Question 16

What does gravitational potential energy depend on?

Answer 16

Gravitational force (mg)
Height above the reference point

Question 17

How is gravitational potential energy measured?

Answer 17

In Joules

Question 18

What is kinetic energy?

Answer 18

Energy of motion

Question 19

What affects kinetic energy?

Answer 19

Mass

The speed at which the object moves

Question 20

What kind of quantity is energy?

Answer 20

Scalar

Question 21

What is the formula for kinetic energy?

Answer 21

Ek=1/2mv^2

Question 22

What is the symbol for kinetic energy?

Answer 22

Ek

Question 23

What is mechanical energy?

Answer 23

The mechanical energy of an object is the sum of its kinetic energy and its gravitational potential energy

Question 24

What is the symbol for mechanical energy?

Answer 24

Em

Question 25

What is the law of conservation of mechanical energy?

Answer 25

Mechanical energy is conserved during free fall

Question 26

How does the law of conservation of mechanical energy affect calculations?

Answer 26

The gravitational potential energy at the beginning of free fall will be equal to the kinetic energy just before the object reaches the ground
The sum of the kinetic and potential energy at any point in the free fall will be equal to the total mechanical energy

Question 27

What is the formula for the law of conservation of mechanical energy?

Answer 27

Em top = Em bottom

Question 28

What is the relationship between the velocity and the mass of a falling object?

Answer 28

They are independent of one another

Question 29

What does the Principle of Conservation of Energy state?

Answer 29

That energy cannot be either created or destroyed

Question 30

What happens when there is air resistance?

Answer 30

Some energy is lost to heat energy

It skews the conservation of mechanical energy