Force

Forces are everywhere. Forces are a push or pull on an object. They can be due to phenomena such as Gravity, Magnetism, or anything that might cause a mass to accelerate.

[|Force] can be a push or pull. A force is any influence that causes an object to change its movement, direction, or geometrical construction. A force can cause an object with mass to change its velocity (which includes to begin moving from a state of rest), i.e., to accelerate, or which can cause a flexible object to deform. A force has both magnitude and direction, making it a vector quantity.

Some [|forces] are easy to understand. Multiple forces such as gravity and friction combine to make the net force.

The [|different types of force] are static load, dynamic load, internal resistance, tension, compression, shear and torsion.
 * [|A New Angle on Force] (images) - explore forces that are directed at angles to the horizontal and vertical.

[|Introduction to Forces] (video 8:26) [|Friction] (video 11:35) - An introduction to friction and coefficient of friction. The diagrams show a block on a flat surface and an inclined plane. Forces are resolved and added together to determine their magnitudes and the net force.
 * May the force be with you**
 * **Ask** - Multiple forces such as gravity and friction combine to make the [|net force]. What are forces are all around us?
 * **Imagine** - Some force is good and we need more. Other forces we want to reduce. What are some ways to increase force? How can force be reduced?
 * **Plan** - In general, the total of all forces on an object are equal to zero if the object is not moving. What are some ways to get a moving object to stop? What forces are needed?
 * **Create** - An object can move if more force is applied OR if less force is applied. How are forces measured? How can force be removed?
 * **Improve** - Are there better ways to tell what forces are acting on an object?


 * That's engineering**
 * [|air resistance] - air pushing on a moving object which slows it down.
 * [|Free-body diagram] - diagrams used to show the relative magnitude and direction of all forces acting upon an object in a given situation. A free-body diagram is a special example of the vector diagrams

> net force, vectors, gravity, electromagnetic, atomic/ nuclear, friction, tension, elastic, torque,
 * Engineering ideas**

Now it is your turn. Here are some challenges for you to work on...
 * Do it**
 * [|Roller Coaster Designer] - Bend and shape the track of your roller coaster to send passengers on a thrilling, yet safe ride.
 * think about a hot air balloon and an airplane. What forces are the same? What are different? Look this up if you need to find the information. Illustrate your findings.
 * [|Touchdown Challenge] - Design and build a shock-absorbing system that will protect two “astronauts” when they land. Follow the engineering design process to design and build a shock-absorbing system out of paper, straws, and mini-marshmallows; attach the shock absorber to a cardboard platform; and improve the design based on testing results.
 * [|Monster Physics] (interactive simulation, app, free (lite)) - comes with 50 missions to solve including simple tutorials as well as mind-bending challenges. Many of the missions are open-ended and can be solved with a wide variety of different solutions


 * Learn more...**
 * [|Ideas for learning about forces] - lots of activities to go along with the explanations
 * [|Force] video
 * [|Different Types of Force] - static load, dynamic load, internal resistance, tension, compression, shear and torsion
 * [|Types of forces] - explanation, animation, games, quizzes
 * [|Force]
 * [|Friction] 11:35 - An introduction to friction and coefficient of friction.

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