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Create an applied force and see how it makes objects move. Change friction and see how it affects the motion of objects. Explore the forces at work when pulling against a cart, and pushing a refrigerator, crate, or person.
- HTML5
An interactive simulation by PhET to explore the effects of...
- HTML5
An interactive simulation by PhET to explore the effects of forces and motion on different objects, including adjusting friction levels.
List the various types of friction. Calculate the magnitude of static and kinetic friction, and use these in problems involving Newton’s laws of motion. When a body is in motion, it has resistance because the body interacts with its surroundings. This resistance is a force of friction.
Friction is a force that opposes relative motion between systems in contact. One of the simpler characteristics of friction is that it is parallel to the contact surface between systems and always in a direction that opposes motion or attempted motion of the systems relative to each other.
Figure 6.10 Frictional forces, such as f →, f →, always oppose motion or attempted motion between objects in contact. Friction arises in part because of the roughness of the surfaces in contact, as seen in the expanded view.
Create an applied force and see how it makes objects move. Change friction and see how it affects the motion of objects. Determine the sum of forces (net force) on an object with more than one force on it. Predict the motion of an object with zero net force.
Friction is a force between solid surfaces in contact. Friction is tangential to the surface and points opposite the direction of motion (or intended motion).
