A lever makes work easier because it allows a person to move an object using less force. To reduce the force that is necessary to move the object, the person using the lever has to increase the distance for the area they are applying the force.
A lever rotates on a fulcrum, which is a fixed point. The lever is generally a rigid bar and the person moving the object has the object on one end of the lever and they use the other end to apply the force necessary to move it. The fulcrum goes between both of these points.Learn More
The only way to experience the effects of zero gravity, without going into outer space, is to ride on a zero-gravity flight in an airplane. As the plane passes over the top of a parabolic arc, the cabin becomes a sort of zero-gravity chamber, during which time passengers experience near-weightlessness.Full Answer >
A water rocket works because of air pressure that is builds inside a container filled with water, usually a plastic soda bottle, which is released rapidly through an opening as it tries to escape. The reaction of a water rocket is an excellent example of Newton’s third law of motion, which states that forces exist in pairs.Full Answer >
G-force refers to the force of gravity, equal to a value of 1 for a body at rest at sea level, but which can be increased significantly through vertical or horizontal acceleration. An example of g-force increasing through acceleration is the effect felt by riders on a roller coaster during its downward plunge. The amount of accelerated g-force that a human body can endure is limited, and at levels beginning between 9 and 18 g, it can cause a loss of consciousness.Full Answer >
A piston is a cylindrical plunger that moves within a metal cylinder through the four strokes of the engine cycle: intake, compression, power and exhaust. While their motion is predicated on other engine parts and the mixture of air and fuel, the motion of a piston is central to the functioning of an engine.Full Answer >