What is the purpose of a lever?

• To hold objects together

• To reduce the amount of effort needed to lift an object

• To increase the weight of an object

• To measure the weight of an object

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

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

• A knife

• A staircase

• A bicycle

• A screwdriver

What does a pulley system do?

• Changes the direction of the applied force

• Makes objects heavier

• Decreases the distance an object moves

• Increases friction

An inclined plane makes it easier to lift heavy objects by:

• Decreasing the object's weight

• Increasing the gravitational force

• Reducing the force needed over a longer distance

• Increasing the speed of the object

What is the main advantage of using a wedge?

• It can hold two objects together

• It can split objects apart

• It can reduce friction

• It can change the direction of a force

How does a screw differ from a nail?

• A screw is made of metal, while a nail is made of wood

• A screw can only be used on wood, while a nail can be used on any material

• A screw has threads that provide more holding power

• A screw is always longer than a nail

Which class of lever is a seesaw?

• First class

• Second class

• Third class

• Fourth class

In a wheel and axle system, what happens if the wheel is larger than the axle?

• It requires more force to turn the axle

• It requires less force to turn the axle

• The system becomes a first-class lever

• The system will not work

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

What is the primary function of an inclined plane?

• To decrease the amount of work done

• To increase the amount of work done

• To change the direction of the applied force

• To increase the weight of the object being moved

A screw can be thought of as which simple machine wrapped around a cylinder?

• Lever

• Wedge

• Wheel and axle

• Inclined plane