Robert Hooke Robert Hooke is mainly known for

Robert Hooke • Robert Hooke is mainly known for Hookes Law. • Extraordinary person, inventor, microscopist, physicist, architect surveyor, astronomer, biologist, artist. . With Christopher Wren, he organised the rebuilding of London after the great Fire • Hooke was a disfigured, frail, (possibly) difficult man who was robbed of the credit for his greatest inspirations and ideas. His portraits and many of his creations wilfully destroyed or lost after his death in 1703. ( By Newton? ) • Modern historians are restoring his reputation and call him “The English Michaelangelo”

Hooke in Context 1 • Robert Hooke was born in 1635 on the Isle of Wight. Youngest of two boys and two girls. • Father John Hooke was a C of E vicar and taught Robert at home and in the local school. • Young Robert fascinated by observation, mechanical works, and technical drawing. He built a working wooden clock. • On his father's death in 1648, Robert went to London to buy an apprenticeship. Soon went to Westminster School and specialised in Mechanics

Hooke in Context 2 • In 1653, Hooke secured place at Oxford University as a "chemical assistant" • 1655 to 1661 he worked for Robert Boyle (Boyles Law) constructing, and operating Boyle's air pump. ( Hooke may have developed Boyles Law ) • In 1661, Hooke appointed as Curator to the Royal Society (Experiments) • Awarded Master of Arts in 1663. In 1664, Hooke appointed Professor of Geometry at Gresham College • In 1691 he received the Degree of "Doctor of Physic"

Main Discovery ? • Hooke was an excellent mathematician and developed the equation F =k(Δx), known as Hookes Law, where F is the force in newtons, N k is the 'spring constant' in newtons per metre, N/m Δx is the extension in metres, m

Hooke’s Law – Hooke was an excellent mathematician and developed the equation F =k(Δx), known as Hookes Law, where F is the force in newtons, N k is the 'spring constant' in newtons per metre, N/m Δx is the extension in metres, m

Use and progression of Hooke’s Law • Hookes Law is a basis of Strain ε • ε=(Δx/x) =(extension(m)/original length(m)) for a material and then : • Youngs Modulus E = Stress = σ. Strain ε σ = Stress = Force (Pascals). Area it is usually essential to know Youngs Modulus for any materials used in manufacturing and construction.

Finally… • Any Questions ?