Simple & Complex Machines

What type of simple machine is a seesaw an example of?

• wheel

• pulley

• lever

• screw

How does a pulley make work easier?

• By increasing the amount of force required

• By decreasing the distance over which the force is applied

• By changing the direction of the force applied and providing mechanical advantage.

• By creating more friction in the system

What is the advantage of using an inclined plane?

• Reduces the amount of force needed to lift an object

• Does not affect the force required to lift objects

• Makes it harder to move objects

• Increases the amount of force needed to lift an object

In what way does a wheel and axle function as a simple machine?

• By allowing a force to be applied over a greater distance

• By generating electricity

• By attracting magnets

• By providing insulation

What is the main purpose of a screw as a simple machine?

• To generate electricity

• To provide insulation

• To convert rotational motion into linear motion or force.

• To filter water

How does a wedge help in performing tasks?

• By converting a force into a larger force in the direction of the force.

• By changing the direction of the force to be perpendicular to the object

• By increasing the distance over which the force is applied

• By reducing the applied force

Give an example of a first-class lever.

• Wheelbarrow

• Fishing rod

• Seesaw

• Pulley system

Explain the concept of mechanical advantage in relation to simple machines.

• Mechanical advantage is always greater than 1 in simple machines.

• Mechanical advantage is not affected by the type of simple machine used.

• Mechanical advantage is the same as efficiency in simple machines.

• Mechanical advantage is the ratio of output force to input force in a simple machine.

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

• A fixed pulley reduces the amount of force needed to lift an object, while a movable pulley changes the direction of the force applied.

• A fixed pulley and a movable pulley both reduce the amount of force needed to lift an object.

• 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 reduces the amount of force needed to lift an object.

How does the length of an inclined plane affect its mechanical advantage?

• The longer the inclined plane, the higher the mechanical advantage

• A shorter inclined plane provides a higher mechanical advantage

• The mechanical advantage decreases as the inclined plane length increases

• The length of an inclined plane does not affect its mechanical advantage.