Simple Machines Challenge 4th Grade

What is a lever?

• A lever is a type of fruit.

• A lever is a simple machine.

• A lever is a type of bird.

• A lever is a type of weather phenomenon.

How does a pulley work?

• A pulley works by generating electricity

• A pulley works by making objects disappear

• A pulley works by changing the direction of the force applied to lift or move an object.

• A pulley works by emitting light

Give an example of an element which use a wheel and axle in real life.

• Airplane

• Train

• Bicycle

• Car

Explain the function of an inclined plane.

• An inclined plane has no impact on the force required to lift an object

• An inclined plane make the object more beautiful

• An inclined plane makes more difficult to move an object

• The function of an inclined plane is to reduce the force needed to lift an object

Identify the type of simple machine a seesaw represents.

• pulley

• lever

• wheel

• screw

Name a common household item that uses a pulley system.

• 
• 
• 
• 

What type of simple machine is a pair of scissors?

• screw

• lever

• pulley

• wheel

Explain the role of a ramp as an inclined plane.

• A ramp makes more difficult to move objects

• A ramp makes easier to move objects

• A ramp has no effect on the force required to lift objects.

• A ramp is used to roll objects uphill rather than lift them.

Identify the simple machine involved in opening a bottle cap.

• lever

• screw

• pulley

• wheel

Describe how a shovel uses the concept of a wedge.

• A shovel uses the concept of a wedge by having a sharp, inclined edge that helps penetrate and lift materials like soil or snow.

• A shovel uses the concept of a wedge by changing the color.

• A shovel uses the concept of a wedge by changing the shape

• A shovel uses the concept of a wedge by making more flexible the material