Forces are broadly classified into two categories: contact forces, which are required to make contact with the object in order for them to work, and action-at-a-distance forces, which can act on objects placed at a distance. Contact forces include applied force, frictional force, normal force, spring force, tension force and air resistance. Action-at-a-distance forces include gravitational force, magnetic force and electrical force.Know More
An applied force is the force exerted on an object with the intent to move it. Frictional force is the force that opposes motion. Static friction acts on objects at rest and prevents them from moving. Kinetic friction acts on objects in motion and works in a direction opposite to the motion. Air resistance is a kind of friction exerted by air on moving objects.
Normal force is exerted on an object by the surface it is resting on to support its weight. Spring force is exerted by either a compressed or stretched spring. Tension force is the force acting on a rope or a string that is pulled tight by a load attached to it. Gravitational force is the attractive force that acts between two objects. It is directly proportional to the mass of the object, which means that heavier objects have a more pronounced gravitational force. Magnetic force is the force between two magnetic poles, which may be attractive for unlike poles or repulsive for like poles. Electrical force is the force between two electrical charges, which also may be attractive for unlike charges and repulsive for like charges.Learn More
Deceleration is synonymous with slowing down or is related to the relative directions of velocity and acceleration. The meaning of the word in common language differs from its meaning in physics.Full Answer >
Scissors are composed of two different types of simple machines: wedge and lever. The scissors' blades are sharpened into wedges, and the arms that are squeezed together are levers.Full Answer >
A toilet paper dispenser is an example of a wheel and axle. The rod that supports the roll of toilet paper serves as the axle, and the toilet paper roll serves as the wheel. Like all wheel and axle machines, the toilet paper rotates concentrically around the cylindrical holder, which is fastened in place.Full Answer >
The formula for acceleration is given as a = (v2 - v1) / (t2 - t1), where "a" denotes the acceleration, "v2" indicates the final velocity, "v1" represents the initial velocity and "t2 - t1" is the time interval between the final and initial velocities. The SI unit for acceleration is meters per second squared (m/s2), while the British imperial unit is feet per second squared (ft/s2).Full Answer >