Newtonian Mechanics and Forces

The impulse-momentum theorem states that the impulse applied to an object is equal to the change in its momentum.

Momentum is a vector quantity because it is the product of a scalar (mass) and a vector (velocity), meaning it has both magnitude and direction.

By definition, one Joule of work is performed when a force of one Newton is applied to an object and moves it a distance of one meter in the direction of the force.

Work is only done by the component of the force that is in the direction of the object's displacement. When pulling a wagon, the forward component of your pull is what causes the displacement.

In physics, work is defined as the dot product of force and displacement vectors. If the force is perpendicular to the motion, no work is done; only the component of force parallel to the motion contributes to work.

Work is defined as the transfer of energy that occurs when a force is applied to an object and causes it to move in the direction of the force.

Air pressure is the force exerted by the weight of the air above a given point. It acts in all directions.

Airplanes are designed with wings that generate aerodynamic lift as they move forward. This lift force overcomes the downward pull of gravity, allowing the airplane to fly and temporarily resist gravity.

Gravity is the attractive force between any two masses. The massive gravitational pull of the Sun keeps Earth and the other planets locked in their respective orbits rather than drifting off into space.

The four fundamental aerodynamic forces of flight are lift, weight (gravity), thrust, and drag. Clouds are a meteorological phenomenon and do not constitute one of these physical forces acting on an aircraft.

Pressure is defined in physics as the force applied perpendicular to the surface of an object per unit area. Gravity, temperature, and mass are different physical properties.

Newton's law of universal gravitation states that the gravitational force between two masses is inversely proportional to the square of the distance between their centers. This relationship is a classic example of an inverse square law.

Gravitational attraction depends on the masses of the objects involved. Among the given pairs, a car and the road have the greatest combined mass, resulting in the strongest gravitational attraction between them.

Gravity is a fundamental force that always pulls objects toward each other, meaning it is strictly an attractive force. Unlike electromagnetism, gravity does not have a repulsive component.

Gravity is the fundamental attractive force that acts between any two objects with mass. Other forces like magnetism require magnetic poles, friction opposes motion between surfaces, and tension is a pulling force transmitted through a string or cable.