1J30.10 Suspended Block

First balance the pulley in line parallel with the plane (pictured on the right). Then balance the other pulley to relieve the plane of its normal force on the block. When the plane is removed, the block will remain static. Using a 2kg block on a 30-degree plane requires masses of 1kg on the right and 1.73kg on the left.

Okay, this one is going to take a little explaining. A small weighted metal cart sits on a ramp that is inclined from left (low) to right (high). Two face-on pulleys are fixed to rods at positions well above and away from the ramp to the right and left. A string extends from the right end of the cart, skimming above the ramp to the right-hand pulley. The string is set so that it exactly parallels the incline of the ramp along the whole of its length as it rises to the pulley. The string then passes over the pulley and falls vertically to its end, which is fastened to a 1-kg hanging hooked mass. Back at the weighted cart, a second string is fastened to the cart at the center of the cart. This string extends upward and leftward from the cart, stretching to the left-hand pulley. From the cart to the left pulley, this second string maintains a strict 90 degree angle with respect to the first string. The second string passes over the second pulley and down to a set of hanging masses. The hanging masses on the left have a total mass of 1.73 kg. The ramp is a two-part device consisting of two boards hinged together on the left. At the right edge of the ramp, a thin arc of metal serves as a support for the upper board as it moves. The upper board can be slid to any reasonable angle and held in place by a screw that tightens against the metal arc. A protractor and plumb bob fastened to the underside of the upper board indicate the angle of the ramp, currently about 30 degrees.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Location: Track: L1-1; Cart: B4-4