2016 Chapter 4 Newton S Laws Simulation Lab

2016 Chapter 4 Newton’s Laws Simulation Lab

Newton’s Laws Simulation Lab:

Name______Hour_____ Score____/ 39 pts According to Newton’s 1st Law objects don’t change their motion unless a net force acts on them. This law applies to objects at rest and traveling with a constant velocity. We have difficulty applying this law to constant velocity because of the invisible force of friction acting on objects.

According to Newton’s 2nd Law an object’s mass is defined as the ratio of the net force acting on an object and the resulting acceleration. This law requires vector addition to determine the net force acting on an object. Once you get the net force it is set equal to ma, where m is mass in kilograms and a is acceleration. Mass (inertia) is defined as a property of objects that resists the change in motion.

Learning Target:

Today I am using simulations to apply Newton’s 1st and 2nd Laws to the motion of various objects.

1. Go to http://phet.colorado.edu/sims/html/forces-and-motion-basics/latest/forces-and-motion- basics_en.html

Or to the wiki page and today’s date.

2. Click on “net force”

3. Check “Sum of Forces” and “values”

4. Try various people and try putting them in various orders.

5. What happens if the right force on the wagon equals the left force on the wagon? (circle the correct answer) (1pt)

It remains at rest/ it moves with a constant velocity/ it moves with a constant acceleration

6. Does the order of the people matter in order to win (do you need an anchor in tug of war)? (circle the correct answer) (1pt)

Yes/No

7. Click on “acceleration” at the bottom of the simulation. 2016 Chapter 4 Newton’s Laws Simulation Lab

8. Check all the options on the right hand side. Drag the crate down and to the left. Drag the cup of water from the lower right to place it next to the guy. Slide the friction to “none”

9. Use the right arrow to place a constant force of 500N on the water. Watch what happens. You may need to repeat. What happened to the water in the cup while it accelerated? Use Newton’s 1st Law to explain why this happens (think about that worksheet we did for homework last week). This is how our bodies “sense” acceleration in our inner ears and in our stomachs. If it doesn’t match with visual signals we can suffer motion sickness. (2pts)

10. What was the motion of the cup and water while it was being pushed with an applied force? (circle the correct answer) (1pt)Constant velocity/ constant acceleration

11. What was the motion of the cup and water after the guy falls and no longer pushes the cup and water? (circle the correct answer) (1pt)

Constant velocity/ constant acceleration 2016 Chapter 4 Newton’s Laws Simulation Lab

12. What does the water look like after the guy falls and is no longer pushing? Why (use Newton’s 1st Law to explain)? (2pts)

13. While the water and cup is sliding along slide the friction to “lots”. What is the motion of the cup and water? (circle the correct answer) (1pt)

Constant velocity/ constant acceleration

14. Change the cup and water out for the little kid (40kg). Move the Applied Force slider to the right slowly. Apply up to 180 N to the little kid. What is the motion of the kid? Why? Use Newton’s 1st Law to explain why. (2pts)

15. Use the slider to apply 500 N to the little kid, hold for 10 seconds, and then let go. Use Newton’s 2nd law to explain the motion of the little kid while you are motion and after you let go. (2pts) 2016 Chapter 4 Newton’s Laws Simulation Lab

16. Draw the freebody diagram for a student standing. (Hint: two forces) (1pt)

17. If the student is at rest how do the two forces compare? (circle the correct answer) (1pt)

The two forces are equal and opposite/ the downward force is winning/ the upward force is winning

18. If the student is on an elevator moving with constant velocity. How do the two forces compare? (circle the correct answer) (1pt)

19. The student “feels” very light while he rides the elevator. (circle the correct answer) (1pt)

20. The student “feels” very heavy while he rides the elevator. (circle the correct answer) (1pt)

21. Which force actually determines how you feel when your ride a roller coaster or an elevator? (circle the correct answer) (1pt)

Normal force/ weight 2016 Chapter 4 Newton’s Laws Simulation Lab

22. If you drive fast over a hill (like at maple and Telegraph or 13 mile and Telegraph) how do you feel? (circle the correct answer) (2pts)

I feel light/ heavy.

This tells me that my Normal force/ weight is smaller than my Normal force/ weight.

23. If you are at the bottom of a valley on a roller coaster how do you feel? (circle the correct answer) (2pts)

I feel light/ heavy.

This tells me that my Normal force/ weight is smaller than my Normal force/ weight.

24. Go to http://phet.colorado.edu/en/simulation/legacy/forces-1d or it is the next simulation on the wiki page.

25. Click on the simulation.

26. Click on “graph applied force”, “graph acceleration” and “graph velocity”.

27. Turn friction off

28. Type in 100 N for applied force

29. Click “go”

30. Draw the freebody diagram for the filing cabinet. Label the three forces. (1pt)

31. Fill in the chart below for the object.

32. Click “clear” and repeat until you fill in the following chart. Click on the corresponding object under “choose Object”. You don’t need to drag like the last simulation. (5pts)

Applied Force Mass Resulting acceleration 100 N 200 kg 100 N 400 kg 100 N 10 kg -100 N 300 kg 2016 Chapter 4 Newton’s Laws Simulation Lab

-100 N 25 kg 33. A constant net force results in a (circle the correct answer) (1pt)

constant velocity/constant acceleration.

34. The greater the mass the (circle the correct answer) (1pt)

smaller the acceleration/ greater the acceleration

35. Apply 100 N to the file cabinet and click “go”. While the file cabinet is moving, decrease the applied force to zero. What is the resulting motion of the file cabinet? Why? (2pts)

36. Turn friction “on”.

37. Apply 500 N to the file cabinet. Draw a freebody diagram for the file cabinet and label the forces. (1pt)

38. What is the motion of the file cabinet when you apply 500N? Use Newton’s 1st law to explain this motion. (2pts) 2016 Chapter 4 Newton’s Laws Simulation Lab

39. Apply 600 N to the file cabinet. Draw a freebody diagram for the file cabinent and label the four forces. (1pt)

40. When 600 N is applied to the file cabinet, it moves with a constant velocity/ constant acceleration. Use Newton’s 2nd Law to explain why this happens. (2pts)