Simple Machines

What type of simple machine is a seesaw?

• lever

• wheel and axle

• pulley

• inclined plane

How does a pulley make work easier?

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

• By causing more friction and resistance when lifting or moving an object.

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

• By making the object heavier to lift or move.

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

• Bicycle

• Car

• Rollerblade

• Shopping cart

Explain how an inclined plane helps to lift heavy objects.

• The inclined plane has no effect on lifting heavy objects

• The inclined plane increases the weight of the heavy object

• The inclined plane decreases the distance over which the heavy object is lifted

• The inclined plane allows the heavy object to be lifted with less effort by spreading the work over a longer distance.

What type of simple machine is used to split wood?

• Lever

• Screw

• Wedge

• Pulley

How is a screw different from other simple machines?

• A screw is different from other simple machines because it is made of metal instead of wood.

• A screw is different from other simple machines because it is an inclined plane wrapped around a cylinder, allowing it to convert rotational motion into linear motion.

• A screw is different from other simple machines because it is operated by hand instead of by a motor.

• A screw is different from other simple machines because it is used for cutting instead of lifting.

What is the advantage of using a lever?

• It allows you to apply a smaller force over a longer distance to move a larger load over a shorter distance.

• It increases the amount of force needed to move an object

• It only works with very small loads

• It can only be used in specific situations

Describe how a pulley can change the direction of a force.

• A pulley changes the direction of a force by using magnets

• A pulley changes the direction of a force by redirecting the force applied to the rope or cable.

• A pulley changes the direction of a force by rotating in the opposite direction

• A pulley changes the direction of a force by increasing the force applied

How does a wheel and axle help to move heavy objects?

• By preventing the object from moving

• By increasing the amount of force needed to move the object

• By reducing the amount of force needed to move the object

• By making the object heavier

What is the difference between a wedge and an inclined plane?

• A wedge is always vertical while an inclined plane is always horizontal

• A wedge is always stationary while an inclined plane can move

• The difference between a wedge and an inclined plane is that a wedge is a type of inclined plane with a pointed edge, used for splitting or lifting objects, while an inclined plane is a flat surface tilted at an angle, used to reduce the force needed to lift an object.

• A wedge is used for cutting while an inclined plane is used for lifting