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.
Baseball bats, seesaws, wheelbarrows, and crowbars are types of levers. Wheel & Axle: A wheel is a circular device that is attached to a rigid bar in its center. A force applied to the wheel causes the axle to rotate, which can be used to magnify the force (by, for example, having a rope wind around the axle).