Chapter 5 Vocab Review

Question 1

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

Answer 1

W=Fd

Question 2

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

Answer 2

W=F(cos feta)d

Question 3

Define mechanical work

Answer 3

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

Question 4

What is the equation for kinetic energy?

Answer 4

Ek=mvsquared/2

Question 5

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

Answer 5

Work energy principal

Question 6

Define potential energy

Answer 6

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

Question 7

Define gravitational potential energy

Answer 7

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

Question 8

Reference level

Answer 8

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

Question 9

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

Answer 9

Eg=mgh

Question 10

What is energy

Answer 10

The ability to do work

Question 11

Kinetic energy is what?

Answer 11

Energy possessed by moving objects

Question 12

What is mechanical energy the sum of?

Answer 12

Kinetic and grav. Pot. Energy

Question 13

Define energy transformation

Answer 13

The change of one type of energy into another

Question 14

What does the law of conservation of energy state?

Answer 14

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

Question 15

Define efficiency

Answer 15

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

Question 16

What the formula for efficiency

Answer 16

Efficiency= Eout/Ein x 100%

Question 17

Define energy resource

Answer 17

Energy rich substance

Question 18

Define nuclear fission

Answer 18

The decomposition of large unstable nuclei into smaller more stable nuclei

Question 19

Define nuclear fusion

Answer 19

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

Question 20

Define photovoltaic cell

Answer 20

A device that transforms energy into electrical energy

Question 21

Define hydroelectricity

Answer 21

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

Question 22

What is the formula for power?

Answer 22

P= E/t

Or P=W/t

Question 23

Define power

Answer 23

The rate of transforming energy or doing work

Question 24

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

Answer 24

E=Pt