What is the primary purpose of simple machines?

• To increase the amount of work done

• To make work easier by reducing the effort needed

• To use electrical power efficiently

• To make work more complicated

Which part of the body acts as a lever?

• Foot and ankle

• Head and neck

• Arm and elbow

• Leg and knee

How does an inclined plane make work easier?

• By making the surface smoother

• By reducing the distance over which work is done

• By increasing the force needed

• By increasing the distance over which work is done

What is a screw essentially?

• A pulley with grooves

• A wedge with a handle

• An inclined plane wrapped around a cylinder

• A lever wrapped around a cylinder

How do pulleys help in moving loads?

• By changing the direction of the force applied

• By increasing the weight of the load

• By making the load lighter

• By reducing the distance the load needs to be moved

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What is a wedge typically used for?

• To move objects horizontally

• To reduce friction

• To separate or cut things

• To lift heavy objects

Which simple machine is used when you eat with your teeth?

• Pulley

• Wedge

• Lever

• Inclined plane

How does the shape of a boat help it move through water?

• By reducing friction

• By making it heavier

• By making it lighter

• By increasing friction

What is the function of a wheel and axle?

• To make the load heavier

• To move a load with less force

• To reduce the distance moved

• To increase the force needed

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NGSS.MS-PS2-2

Which of the following is an example of a wheel and axle?

• Pizza cutter

• Scissors

• Flagpole

• Stairs