(Solved): Activity 2t Motion at a Constant Velocity with Reduced Friction Predietion P4. Consider a cart movi ...

Activity 2t Motion at a Constant Velocity with Reduced Friction Predietion P4. Consider a cart moving with the velocity shown in the graph below. In this scenario, the friction on the cart is very small - nearly zero. Sketch on the axes below a graph of the force needed to make the cart move with the velocity depicted in the graph below. Label the line "Prediction". You will now test your prediction by reducing the friction force in steps. You will end up testing with the minimum possible friction force. It is impossible to eliminate the friction force entirely. 1. Reduce the friction force by turning the adjusting bolt on the cart about one-sixth turn clockwise as viewed from the bottom of the cart. Redraw the force graph for Run #II on the axes above. Click on Data, Hide run 2 then repeat to hide run \( \# 3 \). 2. Zero the foree probe (with the string slack). Click on Collect. After one second, pull the cart using the same method as in activity 1. Remember, it is important to hold the probe so that the string is horizontal and the probe handle and string are parallel to the track. Try to maintain a constant velocity of \( 0.20 \mathrm{~m} / \mathrm{s} \). Repeat as many times as necessary to get a fairly constant velocity. Be sure to pull horizontally. and not at an angle up or down or to the side. Sketch the graphs on the axes above. Then click on Experiment, Store Latest Ran (as Run \( \pm 2 \) ). Label this force line as "Friction mimus one". 3. Reduce the friction force again by tuming the adjusting bolt on the cart another one-sixth turn clockwise as viewed from the bottom of the cart. 4. Zero the force probe (with the string slack). Click on Collect. After one second, pull the cart. Try to maintain a constant velocity of \( 0.20 \mathrm{~m} / \mathrm{s} \). Repeat as many times as necessary to get a fairly constant velocity. Then click on Experiment, Store Latest Run (as Run#3). Label this force line as \( { }^{~} \) Friction mims two", 5. Reduce the friction force to the smallest possible amount by turning the serew so that the friction pad just barley touches the track. 6. Click in the Zero box (with the string slack). Click in the Collect box. After one second, pull the cart. Try to maintain a constant velocity of \( 0.20 \mathrm{~m} / \mathrm{s} \). Repeat as many times as necessary to get a fairly constant velocity. Sketch the graphs on the axes above. Label the force line as "Minimum Friction". Question Q4. What happened to the pull required as you reduced the friction force? Q5. Consider the (ideal) limiting case when there is no friction force at all. How large a force do you think would be necessary to keep the cart moving with constant velocity?