School violence is becoming an epidemic in America. How can schools protect their teachers—and teach them how to protect their students? Read an important brochure about how violence affects teachers personally, emotionally, financially,...

Explains what each of the four fundamental forces is and their interactions with the physical world. The four types are the strong force, the weak force, the electromagnetic force, and the gravitational force.

Explore the forces at work when you try to push a filing cabinet. Create an applied force and see the resulting friction force and total force acting on the cabinet. Charts show the forces, position, velocity, and acceleration vs. time....

Explore the forces at work when you try to push a filing cabinet. Create an applied force and see the resulting friction force and total force acting on the cabinet. Charts show the forces, position, velocity, and acceleration vs. time....

How is the motion of an object affected by forces that act on that object? Can you predict how the motion of an object will be affected by balanced and unbalanced forces? Is there a relationship between force, mass, and acceleration? In...

By the end of this section, you will be able to define nonconservative forces and explain how they affect mechanical energy, and to show how the principle of conservation of energy can be applied by treating the conservative forces in...

Forces are everywhere. Learn what they are, the characteristics of forces, different kinds of forces, and factors that affect them.

In the following interactive students will begin to understand the four basic forces that underlie the processes in nature.

Explore the forces at work when you try to push a filing cabinet. Create an applied force and see the resulting friction force and total force acting on the cabinet. Charts show the forces, position, velocity, and acceleration vs. time.

Explore the forces at work when pulling against a cart, and pushing a refrigerator, crate, or person. Create an applied force and see how it makes objects move. Change friction and see how it affects the motion of objects.

In the following interactive students will begin to discuss the inertial frame of reference and the non-inertial frame of reference. They will also describe the effects of the Coriolis force.

In the following interactive students will begin to define normal and tension forces. They will apply Newton's laws of motion to solve problems involving a variety of forces and use trigonometric identities to resolve weight into...

This video segment explains centripetal force and illustrates how roller coasters rely on it to give you a thrilling ride. Includes background reading material and discussion questions. [4:40]

In this interactive activity from NOVA, discover how centripetal force can affect you when riding in a car or flying at high speeds in a fighter jet.

Explains what intramolecular and intermolecular forces are and the different types for each. Includes lots of examples.

Learners investigate moving charges in magnetic fields. Some topics explored in the activities are Lorentz force, motion of a charge, and magnetic fields. The resource consists of video clips, lecture notes, online textbook chapters,...

An interactive simulation that teaches about gravitational force, Newton's Third Law, and force pairs by varying properties affect the gravitational force exerted between two objects. This simulation can either be downloaded or played...

Manipulate the mass and distance of two objects to see how these properties change the gravity force.

Students learn about G forces. The resource discusses gravity forces, fainting in the air, acceleration, and zero G?s.

How do Newton's Laws connect with electrical forces? This overview illustrates how they blend together. After studying this explanation, test understanding with the review questions provided.

By the end of this section, you will be able to define linear momentum, explain the relationship between linear momentum and force, state Newton's second law of motion in terms of linear momentum, and calculate linear momentum given mass...

What keeps you in your seat of a giant loop-de-loop roller coaster? Surprisingly, it is not the seatbelt but the seat. It works because of something called centripetal force and it does much more than make a great roller coaster. In this...

This Science Buddies project explains how to build a mechanism that will reproducibly swing a hammer so you can determine the amount of force needed to hammer a nail through various densities of wood. The Science Buddies project ideas...

See how forces affect various items that are pushed or pulled.