Question

PRE-LAB 3: Acceleration and Force 1. (3pts) In Part 1, you will repeat your Lab 2 Speeding Up experiment with a focus on forces. . Draw a free-body diagram of the forces acting a. on the cart. otes Draw a free-body diagram of the forces acting on the mass. b. Which forces in the two diagrams are equal? c. oipol 3. (4 pts) We will be using the same cart and motion sensor setup we used in last lab: Force Motion Probe Sensor ro Cart With resnect to the L Tape Procedure Part I: Pulling and pushing the cart Pulling: We will repeat some of the procedures from Lab 2, but instead of focusing on the motion graphs and acceleration, we will focus on forces. Don't let the cart ram thee base of the pulley tower Force Probe Cart Figure 1: Cart+ Force Probe Connect the force probe to LabQuest2 and connect LabQuest2 to the computer. Use masking tape to securely attach the force probe to the top of the cart. Open Logger Pro and zero the force probe (before attaching to pulley system): Experiment Zero. Try gently pushing and pulling on the probe's hook and watch the force value at the lower left corner of the screen. Which action gives a positive value, and which gives a negative value? Set up the cart, ramp, pulley, LabQuest2, and motion detector as shown in Figure 2. Hook the string to the probe, not the cart. to B do-d Figure 2: Pulley and Cart Apparatus Bring the cart's friction pad up. Twist the wing nut on top of the cart; do not touch the friction nad. Hang a 30g mass on the paperclip at the end of the string. When you release the mass, it should accelerate downward. If it does not, check that the string hasn't fallen off the pullevs. You may add mass for smoother motion. Logger Pro: File Open Additional Physics Tools for Scientific Thinking MechanicsLO3 A2-1. 1. Hold the cart 0.15m from the detector. Click the Collect button and wait to release the cart until you hear the motion detector clicking. Stop the cart before it rams the base of the pulley tower 2. Make sure the detector can "see" the cart all the way to the end of track. You may need to adjust the detector and retake data. button to zoom in on the curves. 3. Once you have your plots, click the 4. Add 300g to the cart (rest them on the other side of the wing nut from the force probe). 5. Collect data for the cart's motion and force. 6. Remove the masses from the cart. Unhook the cart from the string attaching it to the pulley. Do not remove the force probe. Tighten the wing nut on the cart to bring the friction nad do AA 7. Next you will give the cart a push (refer to Figure 3). "Push" means gently push, so that the cart does not bit the motion sensor; relevant data is afer your hand is no longer in contact with the cart. How is the string pulley and weight different than a push? When will the force of the push act on the cart? Monons Served Can Figure 3: Force of a Push 8. Sketch each team member's prediction for the resulting force vs. time graph when you push the cart. Force of Push over Time 10 Time (s) Test your prediction by clicking Collect and pushing on the force probe. Sketch the result below. Label what happened with the push during different phases of the graph. Force of Push over Time 10 -10 Time (s) 10. Predict how you expect the graph to change if you push harder on the force probe. Force of Push over Time C -10 Time (s) (N) a0uo (N) 80u04 (N) 00u0

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