Simple and compound machines

What are machines?

• Machines are things which play with an object

• Machines are instruments which give us things

• Machines are instruments which help us perform a job

• Machines are objects which help us only on Wednesday

Types of machines

• Simple and complete machines

• Simple and compound machines

• Simple and non-simple machines

• Compound and essential machines

Types of simple machines

• Wheel, lever, pulley and inclined earth

• Chair, lever, pulley

• Wheel, arrow and inclined circule

• Wheel, lever, pulley and inclined plane

What are compound machines?

• Consist of one simple machines like a wheel

• Consist of two or more simple objects

• Consist of two or more compound machines

• Consist of two or more simple machines

Three of these are compound machines. Which ones?

• Cars

• Wheel

• Bicycles

• Scissors

• Pulley

Choose the correct sentence

• Lever helps move heavy objects

• Lever helps make objects

• Lever helps move beautiful objects

• Lever helps draw heavy objects

Choose the correct sentence

• Pulley helps us create some objects

• Pulley helps us play with some objects

• Pulley helps us lift heavy objects

• Pulley helps us move lazy objects

What is a pulley?

• It is a square and axle with a rope or a chain around it.

• It is a wheel and axle with a rope or a chain around it.

• It is a wheel, rigid bar and axle with a rope around it.

Parts of a pulley

• Wheel, axle and rock

• Wheel, axle and rope

• Wheel and rope

• Circule, wheel, axle and rope

What is a lever?

• It is a flexible bar that rests on a fixed point.

• It is a rigid circle that rests on a fixed point.

• It is a rigid bar that rests on a fixed point.