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Force and motion
Forces and motion are discussed in this document. It defines a force as a push or pull and explains that all motion is due to forces acting on objects. Motion is defined as a change in an object's position over time. Balanced and unbalanced forces are compared, with unbalanced forces being able to cause motion. Common forces like gravity, friction, and air resistance are described. Examples are provided to illustrate key concepts around forces.
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Covers the definition of force, types of motion, net force, balanced and unbalanced forces.
Explains net forces, how they interact, friction, and gravity's role in motion.
A series of questions about net forces, gravity, and motion to test understanding of concepts.
Provides contact information for workshop instructors related to force and motion education.
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Force and motion
- 2. What causes anobject to move? A FORCE! ALL motion is due to forces acting on objects! What is a force? A push or a pull MOTION
- 3. Motion What ismotion? A change in the position of an object over time. How do you know something has moved? You use a reference point! A stationary (not moving) object such as a tree, street sign, or a line on the road. Did the beaver move?
- 4. Can more than oneforce act on an object at the same time? #2 #3 #1 YES! Example: Gravity is pulling you down to Earth, the ground is supporting you, and your legs moving you forward as you run during PE. The total combination of the forces acting on an object is called NET FORCE.
- 5. Balanced Forces Abalanced force is one in which the net force equals ZERO. Do you think there will be any motion? NO! Examples: 25 Newtons 25 Newtons
- 6. Unbalanced Forces Anunbalanced force is one in which the net force is greater than zero. Do you think there will be any motion? YES! Examples: 25 Newtons 40 Newtons 2 N 50 N
- 7. Only an _______________ forcecan change the motion of an object. Example: Your doggy can cause you to move if he pulls with enough force. His force is greater than the force you’re using to stay in place
- 8. What would happenif an unbalanced force acted on an object that’s already in motion? It will change the speed or direction of the object. Example: Your sisther is driving her car. You run up behind her and give her a push. Your force adds to the existing force causing her to speed up.
- 9. Unbalanced forces canact in the same direction. Example: You’re pushing a cabinet across the room with a force of 15 N. You’re friend is pulling with a force of 10 N. What is the NET FORCE? What direction is the cabinet moving? 15 Newtons 10 Newtons
- 10. Unbalanced forces canact in opposite directions. Example: Six people are tugging on a rope. Three people pulls with a force of 20N and the other pulls with a force of 25N. What is the NET FORCE? What direction is the rope moving? 25 Newtons20 Newtons
- 11. Friction and Gravity What is friction? A force that opposes the motion of an object It’s a “contact” force! Occurs when an object in motion rubs against a surface. The contact reduces the speed of the object and releases heat.
- 12. What affects the amountof friction? The force of the push/pull The harder you push, the longer it’s going to take friction to stop the object. The bumpiness of the surface The rougher the surface, the more friction. The weight of the object The heavier the object, the more friction.
- 13. What isgravity? The force of attraction between all objects. The amount of gravity depends on two things: The objects’ masses The distance between the two objects
- 14. Since theearth is so large, everything on it is attracted to it even if they’re not touching! Example: Apple fall Apple fall because the gravity of the earth.
- 15. 1. What isthe net force on the box shown below? a)10 N to the left b) 10 N to the right c) 60 N to the left d) 50 N to the right 10 N 10 N 10 N Questions Choose the correct item.
- 16. 1. What isthe net force on the box shown below? a)10 N to the left b) 10 N to the right c) 60 N to the left d) 50 N to the right 10 N 10 N 10 N Questions Choose the correct item.
- 17. 2 .Which forcealways pulls downward on objects? a) Support force b) Friction force c) Gravity d) Air resistance
- 18. 2 .Which forcealways pulls downward on objects? a) Support force b) Friction force c) Gravity d) Air resistance
- 19. 3.A force isdescribed as... a) A push only b) A pull only c) A push or a pull d) None of the above
- 20. 3.A force isdescribed as... a) A push only b) A pull only c) A push or a pull d) None of the above
- 21. 4. A changeto an objects motion is caused by... a) Balanced forces b) Unbalanced forces c) Acceleration d) Velocity
- 22. 4. A changeto an objects motion is caused by... a) Balanced forces b) Unbalanced forces c) Acceleration d) Velocity
- 23. 5.Describe the motionof a person not wearing a seat belt if the car stops suddenly. a) The person and car will stop together. b) The person will stop faster than the car because they are lighter. c) The car will stop and the person will keep moving forward because of inertia. d) The car will stop and the person will speed up.
- 24. 5.Describe the motionof a person not wearing a seat belt if the car stops suddenly. a) The person and car will stop together. b) The person will stop faster than the car because they are lighter. c) The car will stop and the person will keep moving forward because of inertia. d) The car will stop and the person will speed up.
- 25. 6.A falling objectis pulled down by the earth. The earth is pulled up toward the object. Why doesn’t the earth move? a) Only the earth has gravity. b) The Earth has a very large mass and a small acceleration. c) The Earth has a very small mass and a large acceleration. d) Air resistance gets in the way.
- 26. 6.A falling objectis pulled down by the earth. The earth is pulled up toward the object. Why doesn’t the earth move? a) Only the earth has gravity. b) The Earth has a very large mass and a small acceleration. c) The Earth has a very small mass and a large acceleration. d) Air resistance gets in the way.
- 27. 7.What forces areacting on a dropped book that falls to the floor? a) Gravity only b) Gravity and air resistance c) Air resistance d) Friction only
- 28. 7.What forces areacting on a dropped book that falls to the floor? a) Gravity only b) Gravity and air resistance c) Air resistance d) Friction only
- 29. 8.Which ball willhit the ground first? wood ball Plastic ball metal ball a) Metal first, then plastic, then wood last b) Wood first , then plastic, then metal last c) They will all hit at the same time. d)There is no way to tell.
- 30. 8.Which ball willhit the ground first? wood ball Plastic ball metal ball a) Metal first, then plastic, then wood last b) Wood first , then plastic, then metal last c) They will all hit at the same time. d)There is no way to tell.
- 31. 9. A duckflies 60 meters in 10 seconds. What is the duck’s speed? a) 600 m/s b) 50 m/s c) 6 m/s d) 70 m/s
- 32. 9. A duckflies 60 meters in 10 seconds. What is the speed? a) 600 m/s b) 50 m/s c) 6 m/s d) 70 m/s
- 33. 10.What unit doscientists use to measure force? a) Newton b) Grams c) Meters d) Meter per second per second
- 34. 10.What unit doscientists use to measure force? a) Newton b) Grams c) Meters d) Meter per second per second
- 35. 11.This test paperis sitting at rest on your desk. Which of the following statements best describes this situation? a)There are no forces acting on your paper. b)Your paper pushes on the desk only. c)The desk pushes on your paper only d)The forces acting on the paper are balanced.
- 36. 11.This test paperis sitting at rest on your desk. Which of the following statements best describes this situation? a)There are no forces acting on your paper. b)Your paper pushes on the desk only. c)The desk pushes on your paper only d)The forces acting on the paper are balanced.
- 37. 12. A beetlecrawls 2 cm/minute for ten minutes. How far did it crawl? a) 8 centimeters b) 5 centimeters c) 2 centimeters d) 20 centimeters
- 38. 12. A beetlecrawls 2 cm/minute for ten minutes. How far did it crawl? a) 8 centimeters b) 5 centimeters c) 2 centimeters d) 20 centimeters
- 39. 13.When you slidea box across the floor what force must your push be stronger than? a) Support force b) Friction force c) Gravity d) Air resistance
- 40. 13.When you slidea box across the floor what force must your push be stronger than? a) Support force b) Friction force c) Gravity d) Air resistance
- 41. 14.The moon hasa smaller mass than the Earth. If you were able to travel to the moon your weight would... a) Increase b) Decrease c) Stay the same d) Vary with day and night
- 42. 14.The moon hasa smaller mass than the Earth. If you were able to travel to the moon your weight would... a) Increase b) Decrease c) Stay the same d) Vary with day and night
- 43. Group Force Mr.WeerachatMartluplao Miss.Mookda Bannabuppha Mrs.Ganyarath Prommakoon Workshop Science and Match Teaching Training in Engilish Program