Types of Forces

The table provides definitions for four kinds of forces. Which option matches each force with its correct position in the table?

• A. 1: Gravity; 2: Friction; 3: Applied Forces; 4: Magnetism

• B. 1: Magnetism; 2: Gravity; 3: Applied Forces; 4: Friction

• C. 1: Gravity; 2: Friction; 3: Magnetism; 4: Applied Forces

• D. 1: Applied Forces; 2: Friction; 3: Gravity; 4: Magnetism

Look at the diagram. Free-body diagrams show all forces acting on an object in a certain scenario. In this diagram, a student is pushing a textbook across a desk from left to right. Which arrow represents the force of friction acting on the textbook?

• F_A

• F_B

• F_C

• F_D

Look at the diagram. Three bar magnets, each with opposing poles, are placed near each other in a straight line. Which of the following variables can change the strength of the magnetic force between the magnets?

• Distance between the magnets

• Color of the magnets

• Material of the table

• Shape of the magnets

Tags

NGSS.MS-PS2-3

Look at the image. Which of the following best identifies and describes the force shown?

• The apple is being pulled toward the ground by gravity due to the strong gravitational force of Earth.

• The apple fell from the tree and toward the ground due to friction of the wind pushing past the apple.

• The apple is being pulled toward Earth due to the strong magnetic pull of Earth.

• The apple is being pushed toward Earth due to applied forces once it breaks free from the branch.

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NGSS.MS-PS2-2

NGSS.MS-PS2-4

Choose all the examples that demonstrate the force of friction.

• A. A bike rolling down a hill

• B. Rubbing hands together to keep warm

• C. Air rushing over and around a car as it drives down the road

• D. A pot resting on a silicone pad to absorb heat from cooking

A metal paper clip lying still on a desk is acted on by multiple forces. When a

magnet is brought close to the paper clip, it moves toward the magnet.

Select all options that identify and describe the forces acting on the paper clip.

• Friction between the desk and paper clip causes it to stay still before the

  magnet acts upon it.

• Magnetic force between the paper clip and magnet causes the paper clip to

  be pulled toward the magnet without the need for contact.

• Normal contact force between the desk and paper clip before the paper clip is

  acted on by the magnet.

• Gravitational force pulls the paper clip down toward the Earth as it rests on

  the desk due to its great mass.

Tags

NGSS.MS-PS2-3

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Match the following forces to how they are working on the cake.

• attraction of the cake to the table

• gravity

• cake plate rubbing on table

• friction

• the force the table is putting on the cake

• normal force

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6-8.AG.7.1

The force of __________________ is a type of friction that works against the motion of falling objects.

• Terminal Velocity
• Gravity
• Free Fall
• Air Resistance

1. Before modern plumbing, people used to draw water up from wells using a bucket attached to a rope.

A bucket filled with water exerts a downward force of 20 N and the rope exerts an upward force of 25 N. What is the net force?

• 5N Upward

• 5N downward

• 45N Upward

• 45N downward

Tags

NGSS.MS-PS2-2

A box is acted upon by two forces from opposite directions. What is the net force applied to the box?

• 10N

• 20N

• 30N

• 40N

Tags

NGSS.MS-PS2-2