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4. unbalanced forces
This document discusses balanced and unbalanced forces through examples like a boat floating in water, a tug of war, and a moving car. It then uses a hypothetical example of a hippo jumping from an airplane to illustrate how gravity and air resistance can create balanced or unbalanced forces. The document asks questions about these examples and has a short quiz at the end to test understanding of balanced and unbalanced forces.
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4. unbalanced forces
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- 2. 1. Do allforces result in movement? 2. What do you think is the net force in the example below? 3. Why? LET’S RECALL! Balanced Forces NO! ZERO! Because the acting forces are equal and in opposite direction and there is no movement!
- 3. Kids, DON’T dothis at home or anywhere!!!
- 4. Does the examplebelow show balanced forces? Weight of the boat with people pulling down (gravity) Water pushing up the boat (buoyancy/resistance) LET’S RECALL! YES
- 5. What do youthink could happen if the forces acting here will be unequal? Consider this!
- 6. The boat willsink! Which is very dangerous to passengers. Consider this!
- 7. So, what is meantby unbalanced forces? the two interacting forces are not equal, so that there is a movement in one direction.
- 8. Examine this tugof war. Each person can pull with exactly (1) force. 1. What is the force for the team on the left side? 2. What is the force for the team on the right side? 3. Which direction will the rope move? 3 forces 2 forces To the left 3 forces 2 forces
- 9. 1. What forcesare interacting here? 2. Which has greater force? 3. How can you tell? Because the car moves towards the direction of the tires’ rotation. Car’s tires rotating towards right Friction from the ground opposing the tires Examine the moving car.
- 10. Balanced or UnbalancedForces?TRY THIS! Unbalanced
- 11. Balanced or UnbalancedForces?TRY THIS! Balanced
- 12. Balanced or UnbalancedForces?TRY THIS! Unbalanced
- 13. The Hippo Jump Suppose,a hippo jumps from a flying airplane, which direction will the hippo moves? Because of the pull (force) of gravity Why?
- 14. The Hippo Jump Howcan we save the hippo?
- 15. The Hippo Jump Howcan we save the hippo?
- 16. The Hippo Jump Openthe hippo’s parachute!
- 17. Saved? Will the hippocontinue to move? Which direction will the hippo move? Yes! Heeeelllp!
- 18. Hippo is stillfalling quickly but not getting faster force of gravity force of air (air resistance) How do we know?
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- 21. 2. Draw andlabel the arrow of the interacting forces. 1. Balanced or Unbalanced Forces?
- 22. force of gravity Forceof air (air resistance) 3. How can we slow “hippo” down? Hippo is still falling quickly but not getting faster
- 23.
- 24. 2. Draw andlabel the arrow of the interacting forces. 1. Balanced or Unbalanced Forces? Unbalanced forces Thrust of rocket engines Pull of gravity
- 25. force of gravity airresistance 3. How can we slow “hippo” down? Answer: Increase air resistance by giving “hippo” a bigger or larger parachute.
- 26. ASSIGNMENT: Suppose, Superman andHulk are pulling a truck at the same time with 20 units of force each. What is the net force acting on the object?
- 27. That’s all for today… moreforces coming next…