Simple Machines

A machine with few or no moving parts is called a ______.

• machine

• compound machine

• simple machine

• work

What simple machine can be used to split things apart and also it can hold open a door?

• Lever

• Pulley

• Wedge

• Screw

What simple machine holds things together?

• Wedge

• Screw

• Lever

• Pulley

What type of simple machine is a seesaw?

• Inclined plane

• Lever

• Pulley

• Wheel and axle

Answer explanation

A seesaw is a type of lever, which consists of a rigid bar that pivots around a fulcrum. It allows for the lifting of one side when weight is applied to the other, demonstrating the principles of leverage.

What type of simple machine is used in a pair of tongs?

• Pulley

• Lever

• Wheel and axle

• Inclined plane

Answer explanation

Tongs operate as a lever, where the pivot point allows the user to apply force on one end to grip objects on the other end. This makes 'lever' the correct choice for the type of simple machine used in tongs.

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NGSS.MS-PS2-1

Which of the following is a type of simple machine?

• Lever

• Engine

• Battery

• Circuit

Answer explanation

A lever is a type of simple machine that helps lift or move loads with less effort. Unlike an engine, battery, or circuit, which are more complex systems, a lever operates on the principle of mechanical advantage.

What type of simple machine is a ramp?

• Lever

• Inclined plane

• Pulley

• Screw

Answer explanation

A ramp is classified as an inclined plane, which is a flat surface tilted at an angle to help lift objects with less effort. This makes it easier to move heavy items upward compared to lifting them straight up.

Which simple machine is used in a flagpole to raise a flag?

• Lever

• Pulley

• Wedge

• Screw

Answer explanation

A pulley is a simple machine that uses a wheel and a rope to lift objects. In a flagpole, the pulley system allows the flag to be raised and lowered easily, making it the correct choice for this function.

Which of the following is an example of a wedge?

• Screw

• Knife

• Wheel

• Pulley

Answer explanation

A knife is an example of a wedge because it has a sharp edge that can split materials apart. Wedges are simple machines that convert force into a splitting action, making the knife a perfect representation of this concept.

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

• Door knob

• Hammer

• Nail

• Rope

Answer explanation

A door knob is an example of a wheel and axle because it consists of a circular knob (wheel) that turns around a central shaft (axle), allowing for easy opening and closing of doors.