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forces

What Is a Force?
Image: iStockphoto.com/Gannet77

What Is a Force?

Like the people in this video, you might think you know what a force is. It's... It's... It's not so easy to explain, is it?

But forces are everywhere, pushing, pulling, causing things to accelerate and change direction. Whenever one object interacts with another, there's a force on each of them. Explore the forces at work around you.

Veritasium
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Scientist Profile: NASCAR Engineer

Scientist Profile: NASCAR Engineer

Ryan Newman is a race car driver and engineer. He uses his knowledge of vehicle design and physical forces to improve his chances of winning his next race. More...

Profile
DragonflyTV/PBS
How Flight Is Affected by Unbalanced Forces

How Flight Is Affected by Unbalanced Forces

Planes would never leave the ground if not for unbalanced forces. Here, finally, is an explanation of what that means. More...

Article
Mansfield Middle School
Circus Physics: Newton’s Laws of Motion

Circus Physics: Newton’s Laws of Motion

Collisions between a man with a giant mustache and hurtling puppies bring to life Newton's laws of motion, including his first law, also known as the "law of inertia." More...

Video
PBS
IDTIMWYTIM: Centrifugal Force

IDTIMWYTIM: Centrifugal Force

Here's a fun video about centrifugal force, which doesn't really exist — despite what playing with a tetherball or riding the "The Rotor" at your local amusement park might make you think. More...

Video
SciShow
Recognizing Forces

Recognizing Forces

Think you can identify all the forces acting on an object in a real-world situation? Test your force sense with this interactive feature. More...

Interactive
The Physics Classroom
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Science in the City: Skateboard Science

Science in the City: Skateboard Science

Skateboarders really put the laws of physics to use. Take a closer look at the science behind skateboarding, while watching some amazing moves. More...

Video
Exploratorium
What Forces Are Acting on You?

What Forces Are Acting on You?

At any moment, forces are pushing and pulling on you, even when you are standing still. Explore the gravitational force, the normal force, and the free-body diagram. More...

Video
Veritasium
Building Big: Forces Lab

Building Big: Forces Lab

Without leaving your chair, you can squeeze, stretch, bend, slide, and twist materials, thanks to this interactive. You can also see real-life examples of the different types of force. More...

Interactive
PBS
Forces Activity

Forces Activity

We can't see forces but we can see the effects they have on objects. Play around with gravity. Measure forces with newtons. And explore balanced forces with this interactive activity. More...

Interactive
BBC
Forces and Motion

Forces and Motion

These simulations let you play with the forces involved in pushing around a dog, a fridge, and more. Make the forces balance or totally not balance. And don't forget to hire the Robot Moving Company.
More...

Interactive
PhET
Internal vs. External Forces

Internal vs. External Forces

All forces belong in one of two main groups. External forces change an object's total mechanical energy (its potential energy plus its kinetic energy). Internal forces don't. More...

Article
The Physics Classroom
Quiz Zone: Force

Quiz Zone: Force

Whenever two objects interact, each experiences a force. Test your knowledge of forces with this quiz. More...

Interactive
PhysicsLessons.com
Skateboard Science: Jumping: The Ollie

Skateboard Science: Jumping: The Ollie

How do skateboarders jump over things? Are their boards stuck to their feet? Understanding the forces involved let's you see what's really going on. More...

Article
Exploratorium
The Meaning of Force

The Meaning of Force

Forces come in many different varieties: among them, frictional, gravitational, electric... Some result from contact between two objects. Some act at a distance. You can meet most of them here. More...

Article
The Physics Classroom

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