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# Forces

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Presentation illustrating force and Newton's first law.

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### Forces

1. 1. Forces… change the motion of objects in predictable ways.
2. 2. Forces change motion <ul><li>Now you will learn: </li></ul><ul><li>What a force is </li></ul><ul><li>How unbalanced forces change motion </li></ul><ul><li>Newton’s first law </li></ul>
3. 3. Force <ul><li>A force is a push or a pull </li></ul>
4. 4. Types of Forces (3) <ul><li>1. Contact force </li></ul><ul><li>When one object pushes or pulls by touching another object, the first object is applying a contact force to the second </li></ul>
5. 5. Types of Forces <ul><li>2. Gravity </li></ul><ul><li>The force of attraction between two masses </li></ul>
6. 6. Types of Forces <ul><li>3. Friction </li></ul><ul><li>A force that resists motion </li></ul>
7. 7. Net Force <ul><li>Overall force acting on an object </li></ul><ul><li>- A net force of 0 is balanced </li></ul><ul><li>- Motion does not change </li></ul>
8. 8. Net Force <ul><li>Unbalanced forces </li></ul><ul><li>- Change motion </li></ul>
9. 9. Newton’s First Law <ul><li>Things keep doing what they’re doing </li></ul><ul><li>Objects at rest remain at rest, and objects in motion remain in motion with the same velocity, unless acted upon by an unbalanced force </li></ul>
10. 10. Inertia <ul><li>Is it easier to push or pull a full shopping cart or an empty one? </li></ul>Inertia – resistance of an object to change the direction or speed of its motion
11. 11. Summary <ul><li>Force- a push or a pull </li></ul><ul><li>Net force- balanced and unbalanced </li></ul><ul><li>3 types of forces </li></ul><ul><li>Contact, Gravity, Friction </li></ul><ul><li>Newton’s first law </li></ul><ul><li>Inertia </li></ul>