# (c) Work and power

## 4.11 know and use the relationship between work done, force and distance moved in the direction of the force: W = F × d

Work Done (J) = Force (N) x distance moved (m) ## 4.12 know that work done is equal to energy transferred

 Work done = energy transferred

## 4.13 know and use the relationship between gravitational potential energy, mass, gravitational field strength and height: GPE = m × g × h

Gravitational potential energy  (J) =  Mass (kg) x gravitational field strength (N/kg) x height (m)

## 4.14 know and use the relationship: kinetic energy = 1/2×m×v^2

Kinetic energy (J) = 0.5 x mass (kg) x velocity (m/s)  2

## 4.15 understand how conservation of energy produces a link between gravitational potential energy, kinetic energy and work

Because energy is conserved the decrease in GPE = increase in KE, for a falling object if no energy is lost to the surroundings

## 4.16 describe power as the rate of transfer of energy or the rate of doing work

power is the rate of transfer of energy, or the rate of work done. so p = E/t

## 4.17 use the relationship between power, work done (energy transferred) and time taken: Select a set of flashcards to study:

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Section 1: Principles of chemistry

a) States of matter

b) Atoms

c) Atomic structure

d) Relative formula masses and molar volumes of gases

e) Chemical formulae and chemical equations

f) Ionic compounds

g) Covalent substances

h) Metallic crystals

i) Electrolysis

Section 2: Chemistry of the elements

a) The Periodic Table

b) Group 1 elements: lithium, sodium and potassium

c) Group 7 elements: chlorine, bromine and iodine

d) Oxygen and oxides

e) Hydrogen and water

f) Reactivity series

g) Tests for ions and gases

Section 3: Organic chemistry

a) Introduction

b) Alkanes

c) Alkenes

d) Ethanol

Section 4: Physical chemistry

a) Acids, alkalis and salts

b) Energetics

c) Rates of reaction

d) Equilibria

Section 5: Chemistry in industry

a) Extraction and uses of metals

b) Crude oil

c) Synthetic polymers

d) The industrial manufacture of chemicals

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