How this happens could be from one or more causes. One common view is that caffeine narrows the blood vessels by blocking the hormone that normally keeps them open â adenosine. Caffeine also can stimulate cortisol and adrenaline to be released, which can cause a direct increase in blood pressure.
Second-order levers are mechanisms which feature the input force and output force on the same side of the fulcrum, with the input force furthest from the fulcrum. A great example of a second-order lever is a wheelbarrow. Similar to first-order levers, in a second-order lever the output force will be greater than the input force. However, the output travel will be less than the input travel. In this case, both the input and output forces will act in the same direction.
B. Class 2 Levers. The class 2 lever has the fulcrum at one end, the force at the other end, and the load in the middle. A common example is the wheelbarrow, where the wheel is the fulcrum, the load rests within the box, and the force is the lift supplied by the user.A class 2 lever always has a mechanical advantage of greater than 1.he class 1 lever has the fulcrum between the force and the load, as in a seesaw. When two people of equal weight use the seesaw, they position themselves an equal distance from the fulcrum, and the system is balanced.