A Frisbee flies because its design creates a low-pressure area on top of the object and a high-pressure area on the bottom, giving the Frisbee lift. The thrust is given by the arm of the person throwing it, while the spin imparts stability.Know More
Frisbees fly because of the shape of the object and the kinetic energy imparted as it is thrown. The rim of the Frisbee allows air to move over the top of the object faster than the air moving below it. The faster moving air on top of the Frisbee has a lower pressure than the slower moving air across the bottom, causing the Frisbee to fly. The spin of the Frisbee as it flies gives the object stability through angular momentum, keeping it level and maintaining a smooth and steady flow of air around the Frisbee. The stability imparted by the spin also ensures that the Frisbee sustains the proper angle of attack, which is the ideal angle at which the Frisbee much fly to ensure the most lift.
The principle of the Frisbee's design is easily tested by turning it upside-down and then throwing it as normal. The Frisbee can still fly when thrown inverted, somewhat, but is much more unstable and the amount of lift generated is significantly less.Learn more about Motion & Mechanics
Acceleration refers to the change in velocity of a moving object within a certain period of time, either to a slower or faster pace, while deceleration exclusively refers to the negative acceleration (or slowing down) of an object. In layman's terms, acceleration usually only refers to positive acceleration.Full Answer >
An external force is a force that originates from an object outside of a defined system. For example, if a system is defined as only the bob in a pendulum, both the rope and gravity exert an external force on the bob. If the bob and cord are the system, the force of gravity on the bob and the force the ceiling exerts on the bob are external forces.Full Answer >
Based on Archimedes' Principle, water exerts an upward buoyant force on an object as it is placed in water. This force is equal to the weight of the water being displaced by the object. The object's mass is constant, but weight is relevant to gravity, therefore the object feels lighter.Full Answer >
In physics, equilibrium refers to the state of any object when all forces acting upon it result in zero change of motion for the object. Static equilibrium indicates that the object in question is motionless. Dynamic equilibrium indicates that the object is moving, and will continue to do so unchanged.Full Answer >