Máquinas Simples

What is a lever?

• A rigid bar or beam that is free to pivot around a fixed point called a fulcrum.

• A type of fruit

• A type of clothing

• A musical instrument

Name the three types of levers.

• A, B, C

• Small, medium, large

• First class, second class, and third class

• Red, blue, green

How does a pulley make work easier?

• By reducing the distance the object needs to be lifted

• By distributing the weight over multiple ropes and pulleys

• By making the task more complicated

• By increasing the weight to be lifted

What is the difference between a fixed pulley and a movable pulley?

• A fixed pulley and a movable pulley both change the direction of the force applied.

• A fixed pulley changes the direction of the force applied, while a movable pulley multiplies the force applied.

• A fixed pulley multiplies the force applied, while a movable pulley changes the direction of the force applied.

• A fixed pulley and a movable pulley both multiply the force applied.

Explain how a wheel and axle work together as a simple machine.

• The wheel and axle allow a larger force to be applied over a shorter distance to produce a smaller force over a longer distance.

• The wheel and axle only work in one direction, not both.

• The wheel and axle allow a smaller force to be applied over a shorter distance to produce a larger force over a longer distance.

• The wheel and axle have no impact on force or distance.

Give an example of a wheel and axle in everyday life.

• Screwdriver handle

• Car tire

• Door knob

• Bicycle tire

How does an inclined plane reduce the amount of force needed to lift an object?

• By increasing the weight of the object.

• By increasing the distance over which the force is applied.

• By decreasing the distance over which the force is applied.

• By reducing the friction between the object and the inclined plane.

What is a wedge and how does it work?

• A wedge is a type of shoe worn by athletes

• A wedge is a simple machine that works by reducing the force needed to split or lift an object by increasing the distance over which the force is applied.

• A wedge is a type of fruit that grows on trees

• A wedge is a type of musical instrument

Name three common objects that are wedges.

• Knife, Axe, Doorstop

• Hammer, Screwdriver, Pliers

• Chair, Table, Lamp

• Spoon, Fork, Plate

How a screw is a type of inclined plane.

• A screw is a type of wheel and axle, as it is used for cutting or chopping edge

• A screw is a particular type of inclined plane, where the inclined plane is wrapped around a bar

• A screw is a type of lever

• A screw is a type of pulley