Chapter 5 Vocab Review Flashcards Preview

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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

What formula can the electrical energy used by a device be found with?

E=Pt