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force lab activity...

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Force Activity PHYS 115 Fall 2020 Dr. Straub

In this activity, you will need a rolling object which could be a ball (soccer/basketball/bowling ball) or cylinder (full food can, can of pop, paper towel roll) and a pushing object (broom handle, ruler, etc.). You will be trying to get your rolling object to moving in different ways. There are several rules for interaction between the rolling object and the pushing object: 1) The pushing object can only tap the rolling object with the same force and duration every time. 2) The rolling object needs to be traveling in a straight line (the same direction every time). 3) The contact between the pushing object and the rolling object needs to be short. Before you start the activities, practice with your rolling object and your pushing object to get a feel for how to get the rolling object to move. Different kinds of motion: For each of the motions, - Describe how you used the pushing object to make the moving object move the way it did. - Draw a sketch of the rolling object and indicate the direction of the tapping from the pushing object. - Take a video once you have gotten the desired motion - Analyze it in LoggerPro and put the X vs. T and Vx vs. T graphs in this document. 1) Make the rolling object start from rest and speed up for at least 1 meter (3 feet). Description: I had a bowling ball and meter stick. I tapped the bowling ball at rest rapidly with the same force taps over the 1 meter distance. Picture:

Postion (m) vs. Time (sec) 1.4 1.2

X (m)

1 0.8 0.6 0.4 0.2 0 1.5

2

2.5

3

3.5

4

4.5

5

5.5

6

6.5

Time (sec)

2) Make the rolling object start with a certain speed and get it to stop over at least 0.5 seconds.

Ball is moving f t

3) Make the rolling object start with a certain speed but only slow down and not stop (through 1 meter).

4) Get the rolling object moving and have it keep rolling at a constant velocity for at least 3 seconds.

5) Start the rolling object at rest at one side of the meter space. Move the rolling object to the other side of the meter space, but have it stop as close to the other mark as possible and have it roll back to the starting line. a. If you have someone else in the house, explain to them the idea of what you are doing. If you have another set of materials, try doing this as a race. What is the best strategy if this is a race?

Changing directions So far, all of the motion has been in one direction. If you were using a can or cylinder of some sort before, you will need a ball this time to get it to change direction. 6) Get the ball rolling and with one tap change the ball’s direction. Which direction should you tap it to get the greatest change in direction but not slow it down. Draw a picture (from above) of the initial motion of the ball, the direction you hit it, and the motion of the ball afterward.

7) Get the ball rolling and make it take a sharp corner. (Note: “sharp corner” does not mean “going fast.”) In order not to cheat, make the ball go straight towards a wall and then have it turn to go along the wall about 3 inches away. Draw a picture of what you did to make this happen.

8) Make your ball go in a circle around something 2 times. Draw a picture of how you tapped the ball to make that happen....