Ramp two has a cart with a block under it (creating friction) with one attached spring scale measuring 2.2 N and the other measuring 3 N. Even though the two weight measurements are different, the car is still motionless. This is because the side with the small weight has a force of static friction acting on it, causing both sides of the cart to have equal amounts of force. The other forces acting on this car are the gravitational force f the earth on the block, the normal force of the block on the cart, and the horizontal tension forces of the rope on the cart. The net force of both cars is 0.
The online drawing of forces is at this link. http://www.imaginationcubed.com/loader.php?aDrawingID=276d17d61f25418ca856339574be9174&from_email=alanac1%40comcast.net&from_name=asdf
1 comments:
In this station, we know that there are two tension forces of the rope on the cart. This is because the rope is attached to the wheel on two sides; therefore, each side has a tension force. Alana says, "Ramp two has a cart with a block under it (creating friction) with one attached spring scale measuring 2.2 N and the other measuring 3 N. Even though the two weight measurements are different, the car is still motionless. This is because the side with the small weight has a force of static friction acting on it, causing both sides of the cart to have equal amounts of force."
But if the two weight measurements are different, why doesn't the car move? The static friction force is equal because of the same friction force of the rope on the cart on both sides because of the wheel. Obviously, there is the gravitational force of the earth on the block, the normal force of the block on the cart, and the horizontal tension forces of the rope on the cart. The net force of both cars is 0. This means that even though the ramps have different tension forces, the overall net force is zero because the weights cancel out the difference in the tension forces. The reason that the cart does not move is because the net force is zero, and even though the mass is positive, the acceleration is zero. This is because anytime you multiply a number by zero, the product will be zero.
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