Simple Machines

What is a lever?

• A lever is a simple machine used to lift or move objects by applying force to one end of the bar.

• A lever is a type of musical instrument

• A lever is a type of computer software

• A lever is a type of bird

Name the three classes of levers.

• First-class lever, second-class lever, third-class lever

• A-class lever, B-class lever, C-class lever

• One-class lever, two-class lever, four-class lever

• Primary-class lever, secondary-class lever, tertiary-class lever

How does a pulley make work easier?

• By increasing the amount of force needed to lift or move an object

• By reducing the amount of force needed to lift or move an object

• By making the object heavier to lift

• By making the task more difficult

Explain the difference between a fixed pulley and a movable pulley.

• A fixed pulley increases the amount of force needed, while a movable pulley changes the direction of the force.

• A fixed pulley and a movable pulley both reduce the amount of force needed.

• A fixed pulley reduces the amount of force needed, while a movable pulley increases the amount of force needed.

• A fixed pulley changes the direction of the force, while a movable pulley reduces the amount of force needed.

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

• Rollerblade

• Bicycle

• Car

• Shopping cart

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

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

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

• By increasing the weight of the object being lifted.

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

What is a wedge and how is it used?

• A wedge is a type of fruit used for making smoothies.

• A wedge is a type of shoe worn by athletes.

• A wedge is a simple machine used to separate or lift objects by applying force to push or lift the object apart.

• A wedge is a type of weather phenomenon that causes strong winds.

Describe how a screw is a type of inclined plane.

• A screw is a type of inclined plane because it is a flat surface with one end higher than the other

• A screw is a type of inclined plane because it is a type of lever used to lift heavy objects

• A screw is a type of inclined plane because it is a straight line wrapped around a cylinder

• A screw is a type of inclined plane because it is a spiral wrapped around a cylinder, which forms a continuous inclined plane around the shaft of the screw.

What are the different types of screws and their uses?

• Anchor screws for hanging pictures

• Drywall screws for outdoor use

• Concrete screws for soft materials

• Wood screws are used for wood, machine screws for metal, sheet metal screws for thin metal, and self-tapping screws for creating their own threads in materials like plastic or metal.

Explain the concept of mechanical advantage in simple machines.

• Mechanical advantage in simple machines refers to the ratio of the output force to the input force, allowing the machine to multiply the input force to produce a larger output force.

• Mechanical advantage in simple machines refers to the color of the machine

• Mechanical advantage in simple machines refers to the weight of the machine

• Mechanical advantage in simple machines refers to the speed at which the machine operates