Lab Homework 4: Forces The massless string shown at right is wrapped around two

Question

Lab Homework 4: Forces The massless string shown at right is wrapped around two pullevs. It is tethered to the desk on one side and a mass hangs from the other side. Rank the tensions at the six labeled points along the string. Explain how you determined your ranking 4· Pulley Pulley Hook ancd slotted masses A person stands on a ladder that is resting against a wall. (Assume that there is no fiction between the ladder and the wall.) Draw a free-body diagram of the ladde in the space to the right. Label each force that vou have included as vou did in question1. (Hint: The force on the ladder by the person is not a weight!) 5. 6. In lab, you ranked the coefficients of friction for 3 carts Cart with masses with different materials on the bottom: plastic, cork and fabric. In addition, you calculated the coefficient of kinetic friction for a cart with a cork bottom, and drew a free-body diagram for this cart as it was pulled at constant speed along a track Force probe rac At right, draw a free-body diagram for the cart with the fabiic bottom as it slides at constant speed along the track Sate how (if at all) this diagram is different from the one you drew for the cart with the cork bottom. Explain ii. Which forces in vour free-bodv diagrams have the same magnitude for the cork-bottomed and fabric-bottomed caats? Explain. iii. List all of the forces that are not the same for the two carts. For these forces, state which cat has the larg er force. Explain

Explanation / Answer

(4) As the object is not moving so

tension in the string due to weight of the object and it will be same at all point .

Tension at E and F , T- Mg =0

and same tension at D C and A, B .

so T= Mg everywhere in the system.

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