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# 3rd Grade-Ch. 12 Lesson 2 How does force affect motion

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### Transcript

• 1. CH. 12 LESSON 2 HOW DOES FORCE AFFECT MOTION?
• 2. Activity-Roll On Hypothesis : I predict that the truck will go further with or without rocks. Without rocks With rocks Distance (cm) truck
• 3. force
• any push or pull
• can change an object’s position or direction of motion
• 4. force
• push 
• pull 
push pull
• 5.
• 6. The greater the force on an object, the greater will be its change in its motion.
• 7. friction
• contact force that goes against the motion of an object
• 8. Equal forces in opposite directions do not cause a change in motion. Tug of war
• 9. gravity
• non-contact force that pulls objects toward each other
• the greater the mass  the greater the force of gravity
• 10. weight
• amount of gravity that pulls on an object
• 11. magnetism
• non-contact force that pulls on metals with iron in them
• 12. Let's Review
• 13. FORCE
• any push or pull
• 14. energy
• It takes ________ to apply or exert a force.
• 15.
• A force can cause a _________ in an object’s position or motion.
change
• 16. GRAVITY
• force that pulls objects toward each other
• 17. FRICTION
• contact force that goes against the motion of an object
• 18. mass
• the greater the _______  the greater the force of gravity
• 19. IRON
• Magnetism is a non-contact force that pulls on metals with ___________ in them.