By the end of this topic you should: Objectives. Levers.

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Presentation transcript:

By the end of this topic you should: Objectives

Levers

Big question How many weights can I place on the ruler before it tips?

Hydraulics

2/16/20166 Pressure = Force Area Weight measured in Newton's N Area measured in meters squared M 2 Pressure measured Newton meters squared N/ M 2 or NM - 2

2/16/20167 If you push down one side 5 M the other will move?

2/16/20168

9

10

2/16/201611

2/16/201612

2/16/201613

2/16/201614

Centre of gravity

Center of gravity can be out side the object

geU0X8http:// geU0X8

Pendulum key words Amplitude (how far from vertical the string moves) Period ( time taken for one swing) Frequency ( number of swings per secon)

Which falls faster heavy or light?

per+feather&view=detail&mid=4B4A1DFA 822F65022B7B4B4A1DFA822F65022B7B &first=0&FORM=NVPFVRhttp:// per+feather&view=detail&mid=4B4A1DFA 822F65022B7B4B4A1DFA822F65022B7B &first=0&FORM=NVPFVR

Cirular motion +of+death+fair+ground&view=detail&mid= 0A8553C1DD64230FA31E0A8553C1DD6 4230FA31E&first=0&FORM=NVPFVR

Centripetal force Is any force that acts at 90 degrees to objects motion (towards centre of circle) of object. With out which object flies off in straight line

Magnetic feilds

The earth acts as a magnet

Arrows on field are drawn north to south Where the lines are close together the field is strongest In electromagnets field can change direction by changing the current

day+electric+motor&view=detail&mid=2F7 A37DE404A15A0777A2F7A37DE404A15 A0777A&first=0&FORM=NVPFVRhttp:// day+electric+motor&view=detail&mid=2F7 A37DE404A15A0777A2F7A37DE404A15 A0777A&first=0&FORM=NVPFVR

Make a stronger motor More coils of wire More current Stronger magnet (changing direction of current changes direction of spin)

ctric+motor&view=detail&mid=C357EF84B 0840FC41766C357EF84B0840FC41766& first=0&FORM=NVPFVR

Practical problems

Step up transformer Always with respect to voltage Less coils more coils

Step down transformer Always with respect to voltage Less coils more coils

Stepping up 12 22

Stepping up 1:2 ratio voltage times 2

1:3 ratio voltage times 3 1:4 ratio voltage times 4 1:5ratio voltage times 5 Ratio = big number / small one

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