Flashcards in Chapter 5 Vocab Review Deck (24):

1

## What’s the formula for work done by a constant force?

### W=Fd

2

## What is the formula for work when force and displacement are in different directions?

### W=F(cos feta)d

3

## Define mechanical work

### Work done when a force displaces an object in the direction of the force

4

## What is the equation for kinetic energy?

### Ek=mvsquared/2

5

## What is the relationship between mechanical energy and kinetic energy known as?

### Work energy principal

6

## Define potential energy

### A form of energy an object possesses because of its position in relation to forces in its environment

7

## Define gravitational potential energy

### Energy possessed by an object due to its position to the surface of earth

8

## Reference level

### A designated level which objects may fall; considered to have a grav. Pot. Energy level of 0 J

9

## How do you calculate gravitational potential energy? (The formula)

### Eg=mgh

10

## What is energy

### The ability to do work

11

## Kinetic energy is what?

### Energy possessed by moving objects

12

## What is mechanical energy the sum of?

### Kinetic and grav. Pot. Energy

13

## Define energy transformation

### The change of one type of energy into another

14

## What does the law of conservation of energy state?

### When energy is changed from one form to another no energy is lost

15

## Define efficiency

### The ratio of the amount of energy produced to the amount of energy used expressed as a percentage

16

## What the formula for efficiency

### Efficiency= Eout/Ein x 100%

17

## Define energy resource

### Energy rich substance

18

## Define nuclear fission

### The decomposition of large unstable nuclei into smaller more stable nuclei

19

## Define nuclear fusion

### A nuclear reaction in which the nuclei of two smalla tos fuse together to form a larger nucleus

20

## Define photovoltaic cell

### A device that transforms energy into electrical energy

21

## Define hydroelectricity

### Electricity produced by transforming the kinetic energy of rushing water into electrical energy

22

## What is the formula for power?

###
P= E/t

Or P=W/t

23

## Define power

### The rate of transforming energy or doing work

24