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Ch. 10 , Lesson 5( Levers and pulleys )
• How can you make work easier?
• Is a tool that makes work easier to do. What machines do? can change the direction of force you need to do work.
Vocabulary:MachineSimple machinesLeverWheel and axlepulleyObjectives:I will be able to know:Levers and pulleys are machines make work easier.
machine
1
3
Ch. 10 , Lesson 5( Levers and pulleys )
• some machines change both the direction and amount of force you need to do work.
• • machine can change the
amount of force you need to do work.
Vocabulary:MachineSimple machinesLeverWheel and axlepulleyObjectives:I will be able to know:Levers and pulleys are machines make work easier.
2
3
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Ch. 10 , Lesson 5( Levers and pulleys )
• A machine with few or no moving parts.Vocabulary:
MachineSimple machinesLeverWheel and axlepulleyObjectives:I will be able to know:Levers and pulleys are machines make work easier.
Simple machine
lever
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Ch. 10 , Lesson 5( Levers and pulleys ) Is a straight bar that
moves on a fixed point.All levers have 3 important points.
• Load fulcrum force
Vocabulary:MachineSimple machinesLeverWheel and axlepulleyObjectives:I will be able to know:Levers and pulleys are machines make work easier.
Lever1
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Ch. 10 , Lesson 5( Levers and pulleys )
load the object being lifted or moved.
force the push or pull that moves the lever. fulcrum the point where the lever turns.
Vocabulary:MachineSimple machinesLeverWheel and axlepulleyObjectives:I will be able to know:Levers and pulleys are machines make work easier.
A
B
C
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Ch. 10 , Lesson 5( Levers and pulleys )
• Are there different kinds of Levers?
• There are 3 types according to arrange of force, fulcrum and load.
Vocabulary:MachineSimple machinesLeverWheel and axlepulleyObjectives:I will be able to know:Levers and pulleys are machines make work easier.
1-the fulcrum is between the force and the load .Ex. pliers2-the force is between the fulcrum and the load .Ex. Baseball bat3-the load is between the force and the fulcrumEx. wheelbarrow
wheel and axle• ex: doorknob• wheel=knob• axle=post that
attaches to its center
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Ch. 10 , Lesson 5( Levers and pulleys ) It has a wheel that turns on
a post.The post is called axle
Vocabulary:MachineSimple machinesLeverWheel and axlepulleyObjectives:I will be able to know:Levers and pulleys are machines make work easier.
Wheel and axle2
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Ch. 10 , Lesson 5( Levers and pulleys )
It makes work easier by change strength of the turning force.The wheel turns a long distance , the axle turns a short distance.
Vocabulary:MachineSimple machinesLeverWheel and axlepulleyObjectives:I will be able to know:Levers and pulleys are machines make work easier.
12
Ch. 10 , Lesson 5( Levers and pulleys )
Other examples for wheel and axle:A windlass a bucket tied to a rope to raise water from a well.
Vocabulary:MachineSimple machinesLeverWheel and axlepulleyObjectives:I will be able to know:Levers and pulleys are machines make work easier.
pulley
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Ch. 10 , Lesson 5( Levers and pulleys ) It uses a wheel and a rope
to lift a load.You pull down to lift up.
Vocabulary:MachineSimple machinesLeverWheel and axlepulleyObjectives:I will be able to know:Levers and pulleys are machines make work easier.
pulley3
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Ch. 10 , Lesson 5( Levers and pulleys )
We have 2 kinds of pulleys One-wheel two-wheelPulley pulley
The force less force is And load needed to Are equal move load
Vocabulary:MachineSimple machinesLeverWheel and axlepulleyObjectives:I will be able to know:Levers and pulleys are machines make work easier.