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# 5th Grade-Ch. 13 lesson 2 what are forces

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### 5th Grade-Ch. 13 lesson 2 what are forces

1. 1. Ch. 13 Lesson 2 What are forces?
2. 2. force <ul><li>push  </li></ul><ul><li>pull  </li></ul>push pull
3. 3. force <ul><li>measured in newtons </li></ul>
4. 4. gravity <ul><li>Earth’s gravity pulls other objects toward its center </li></ul>
5. 5. weight <ul><li>amount of gravitational pull on every other object </li></ul>
6. 6. pendulum <ul><li>swings b/c of gravity </li></ul>
7. 7. magnetism <ul><li>force that pushes & pulls on other objects made of iron, nickel & cobalt </li></ul>
8. 8. i ron, n ickel, c obalt AGNETS, INC.
9. 9. strongest force of attraction
10. 10. friction <ul><li>force when 2 materials rub against each other </li></ul>
11. 11. friction <ul><li>slows down motion of an object </li></ul>
12. 13. work <ul><li>energy used when a force moves an object </li></ul>
13. 14. work <ul><li>not done when the position of an object does not change </li></ul>
14. 15. When work is done Activity Work Thinking about a math problem Turning a jump rope Holding a puppy Lifting a puppy Pulling on a locked door Opening an unlocked door Trying to scoop rock-hard ice cream
15. 16. force X distance = work