YEAR 5 SCIENCE CHAPTER 10

What is a machine?

• Is the tool that highly cost of money

• Is the wave that produces sound

• Is the tool that makes a work easy

• Is an equipment that reduces the quality of work

A sustainable machine can save time and cost

• True
• False

What simple machines are in a watch?

• Wedge and Screws

• Wheel and axle, Gears and Screws

• Pulley and Screws

• Wheel and axle

How can you make a machine sustainable?

• Choose the low- quality materials to save cost

• Choose environmentally safe materials

• Invent a machine that saves time and energy

• Make a tool that increases the workload

A nail clipper is consists of wedge and gears

• True
• False

Answer explanation

A nail clipper consists of wedge and lever

Fatimah cannot use her scissors to cut the paper. Why this happens?

• The screw that holds the scissors together is broken

• The paper is too thin

• The wedge (sharp) is rust and not sharp

• The scissor is new

How can you make sure that the bricks are transferred and lifted up to the 3rd floor?

• Use wedge to cut the bricks

• Use pulley system to transfer the bricks (lift)

• Use trolley to move the bricks into lift

• Use inclined plane to lift the bricks

Answer explanation

A trolley is used to transfer the bricks into the lift while a lift is used to go to the 3rd floor

Choose the characteristics of the sustainable tools

• High cost and waste

• Low quality and quantity

• Saves time, energy and workload

• Easy to break

Choose a tool that have same simple machine as an axe

• Trolley

• Fan

• Knife

• Mechanical Pencil Sharpener

How can we save the environment?

• Use sustainable tools

• Use machines that produces a lot of waste

• Choose a machine that dangers the animals

• Avoid machines that produces toxics to environment