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

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### Transcript

• 1. Ch. 13 Lesson 2 What are forces?
• 2. force
• push 
• pull 
push pull
• 3. force
• measured in newtons
• 4. gravity
• Earth’s gravity pulls other objects toward its center
• 5. weight
• amount of gravitational pull on every other object
• 6. pendulum
• swings b/c of gravity
• 7. magnetism
• force that pushes & pulls on other objects made of iron, nickel & cobalt
• 8. i ron, n ickel, c obalt AGNETS, INC.
• 9. strongest force of attraction
• 10. friction
• force when 2 materials rub against each other
• 11. friction
• slows down motion of an object
• 12.
• 13. work
• energy used when a force moves an object
• 14. work
• not done when the position of an object does not change
• 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
• 16. force X distance = work