Please answer # 3 and # 4
A. setting up a track as an inclined plane Set your track up at an angle with a pulley at the high end and with room for a mass to hang down from the pulley. Make measurements to accurately determine the angle of your track. Make your angle at least 20. Be careful not to let your angle change inadvertently during this activity. Also, measure the mass of your cart using one of the scales. sin +46 121 = 22.340 121 cm us 94 angle measured angle: 2 2. 34 measured mass of cart: 507. 79 B. frictionless equilibrium Balancing the cart on the inclined plane with a hanging mass nundint AL - Content that will halanna the sort Charifinally drow canarate predicted mass of basket: 2. Make a basket that can hang down and hold weights. Connect string to your cart, pass it over the pulley, and tie it to your basket. Is it important that the string over the track is parallel to the track? Add mass to the basket to achieve balance between the cart and the hanging mass. You can use pennies to finely adjust the mass. Finally, measure the mass of the basket that achieves balance. measured mass of basket: /60g percentage error relative to predicted mass of basket: 106 /2 possible sources for the error: C. equilibrium with static friction Balancing the cart on the inclined plane in the presence of friction 1. Reset the balance between the cart and hanging mass from part B. Now turn your cart upside down (with the wheels facing up away from the track) so that the cart has friction against the track. The cart should remain in balance. Add small amounts of mass to the basket until the cart just starts to move up the inclined plane. Measure the mass of the hanging basket that just barely causes the cart to move. measured mass of basket: 2209 2. Calculate the coefficient of static friction between the cart and the track. Specifically, draw separate free body diagrams in the space below for the cart and the hanging basket. Apply Newton's laws to calculate the coefficient of friction. Assume that the static friction force has its maximum value (Us N) at this moment that the cart just starts moving. Use your measured angle and the measured masses of your cart and hanging basket. calculated coefficient of static friction, Hs: 0.564 3. Predict the minimum mass of the hanging basket that will barely balance the cart, before it begins to slide down the inclined plane. Specifically, draw separate free body diagrams in the space below for the cart and the hanging basket. Apply Newton's laws to calculate the specific basket mass that should barely balance your cart. Use your measured angle, the measured mass of your cart, and the static coefficient of friction that you calculated in step 2 above. predicted mass of basket: 4. Reset your cart and hanging basket with the cart upside down. Remove mass from the basket until the cart just starts to move down the inclined plane. Measure the mass of the hanging basket that just barely allows the cart to slide down. measured mass of basket: _bog percentage error relative to predicted mass of basket: possible sources for the error
