MACHINES CAN MOVE

How many types of machines are there? What are their names?

• There are two types: complex and singular

• There are two types: simple and complex

• There are two types: simple and plural

• There are two types: singular and plural

How does a plane fly? What forces are applied?

• Drag

• Push

• Lift

• Thrust

• Weight

(a)   's principle states that an object, such as a ship, immersed in water experiences an upwards force (buoyancy) which is equal to the weight of the water it displaces.

_________ is the resistance that the tyres on cars' wheels meet when they move on a road surface.

• Pulley

• Thrust

• Reaction

• Friction

Choose all the simple machines among the given ones.

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(a)   is the push that lets the plane move upwards.

(a)   pushes the ship upwards.

Choose all the complex machines among the given ones.

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For taking off: Lift must be greater than (a)  

What are the forces of flight?

• Thrust, weight, speed, and turbulence.
• Lift, gravity, acceleration, and friction.
• Lift, weight, thrust, and drag.
• Drag, lift, inertia, and pressure.