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Lever

 

A machine is a tool used to facilitate work. This machine acts as a device that uses power to apply forces and control movement to perform an action. There are various types of machines ranging from simple machines and complex machines.
 
10.1  Lever
 
  • A lever is used to lift or pry out an object.
  • The lever consists of three parts, namely
  1. Load, which is the weight of a body
  2. Fulcrum, which is a point on a bar or object that serves as a balancer or support.
  3. Force, which is the repulsion and attraction force on an object that gives an effect.
 
Lever application

  1. The lid of the can acts as a load.
  2. The tip of the screwdriver that touches the can lid is the fulcrum
  3. The hand that pushes the screwdriver downwards acts as a force

 
Relationship between load, fulcrum and force
  • The position of the fulcrum from the load affects the force required to lift the object.
  • To lift a heavy load, we need:
  1. Place the fulcrum closest to the load
  2. The force is applied as far as possible from the fulcrum
  3. Use long sticks, not short sticks. 

  • The closer the load distance from the fulcrum, the lesser the force is needed to lift the load.
  • The farther the load distance from the fulcrum, the more force is needed to lift the load. 
 
 

 

The views expressed in the notes here are those of the contributor and don’t necessarily represent the views of pandai.

Lever

 

A machine is a tool used to facilitate work. This machine acts as a device that uses power to apply forces and control movement to perform an action. There are various types of machines ranging from simple machines and complex machines.
 
10.1  Lever
 
  • A lever is used to lift or pry out an object.
  • The lever consists of three parts, namely
  1. Load, which is the weight of a body
  2. Fulcrum, which is a point on a bar or object that serves as a balancer or support.
  3. Force, which is the repulsion and attraction force on an object that gives an effect.
 
Lever application

  1. The lid of the can acts as a load.
  2. The tip of the screwdriver that touches the can lid is the fulcrum
  3. The hand that pushes the screwdriver downwards acts as a force

 
Relationship between load, fulcrum and force
  • The position of the fulcrum from the load affects the force required to lift the object.
  • To lift a heavy load, we need:
  1. Place the fulcrum closest to the load
  2. The force is applied as far as possible from the fulcrum
  3. Use long sticks, not short sticks. 

  • The closer the load distance from the fulcrum, the lesser the force is needed to lift the load.
  • The farther the load distance from the fulcrum, the more force is needed to lift the load. 
 
 

 

The views expressed in the notes here are those of the contributor and don’t necessarily represent the views of pandai.
Chapter : Machines
Topic : Lever
Year 4 Science
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