Mechanics Quiz & Flashcards

Newton's Second Law states that the force acting on an object is equal to its mass multiplied by its acceleration (F = ma).

The unit of work is the Joule (J), which is defined as the work done when a force of one newton moves an object one meter.

Newton's Third Law states that for every action, there is an equal and opposite reaction.

The gravitational force between two objects is directly proportional to their masses and inversely proportional to the square of the distance between them.

In an elastic collision, both momentum and kinetic energy are conserved.

The net force is the vector sum of all individual forces acting on an object, determining its motion.

Potential energy is the stored energy in an object due to its position or configuration within a force field, such as gravity.

Increasing the distance between two charged objects decreases the electrostatic force between them, following the inverse square law.

Friction is the force that opposes the relative motion of two surfaces in contact.

Mass is a scalar quantity, having only magnitude and no direction, unlike velocity or force.

Kinetic energy is proportional to the square of the speed, so if speed doubles, the kinetic energy increases by a factor of four.

A free-body diagram visually represents all forces acting on an object, aiding in the analysis of its motion.

Simple harmonic motion is a type of periodic motion where the restoring force is proportional to the displacement from equilibrium.

Torque depends on the magnitude of the force, the distance from the axis of rotation, and the angle at which the force is applied.

A lever allows a smaller input force to lift a larger load by increasing the distance over which the force is applied.

An object in free fall accelerates towards the Earth at approximately 9.81 m/s², assuming negligible air resistance.

Weight, which is the force of gravity acting on an object's mass, is measured in Newtons (N).

A compressed spring stores elastic potential energy, which is released when the spring returns to its equilibrium position.

Frequency measures the number of cycles of a wave that pass a given point per second, expressed in Hertz (Hz).

In an inelastic collision, kinetic energy is not conserved, and the colliding objects may stick together after the collision.

Increasing the mass of an object increases its inertia, making it more resistant to changes in motion.

Energy is measured in Joules (J) in the International System of Units.

The normal force acts perpendicular to a surface, supporting the weight of an object resting on that surface.

Doubling the mass of an object doubles the gravitational force acting on it, according to Newton's law of gravitation.

A spring scale measures force, usually in Newtons, by the distance a spring is stretched or compressed.

When an object comes to a stop, its kinetic energy is converted to thermal energy due to friction and other forces.

In a hydraulic system, pressure is inversely proportional to area; as the area increases, the pressure exerted decreases for the same force.

On a frictionless surface, an object will continue in motion at a constant velocity indefinitely unless acted upon by another force.

A hydraulic lift operates on Pascal's principle, which states that pressure applied to a confined fluid is transmitted undiminished throughout the fluid.

Gravity causes an object in free fall to accelerate downwards at approximately 9.81 m/s².

An object in dynamic equilibrium is moving at a constant velocity, meaning the net force acting on it is zero.

Acceleration is defined as the rate of change of velocity over time, indicating how quickly an object's speed or direction changes.