Dynamics (Forces) Big Review

Front

What is the formula for calculating tension in a cable when an object is accelerating upwards?

Back

T = W + ma, where T is tension, W is weight, m is mass, and a is acceleration.

Front

Define weight in the context of physics.

Back

Weight is the force exerted by gravity on an object, calculated as W = mg, where m is mass and g is the acceleration due to gravity.

Front

What is the relationship between mass and weight?

Back

Weight is directly proportional to mass; as mass increases, weight increases, given a constant gravitational field.

Front

Explain the concept of a frictionless surface in dynamics.

Back

A frictionless surface is an idealized surface where no frictional force opposes the motion of an object, allowing for unimpeded acceleration.

Front

What is the significance of a massless string in physics problems?

Back

A massless string implies that the tension is uniform throughout the string and does not affect the dynamics of the system.

Front

How does the acceleration of connected masses over a pulley depend on their weights?

Back

The acceleration is determined by the difference in weights; the greater the difference, the greater the acceleration.

Front

What is the formula for calculating acceleration in a system of connected masses?

Back

a = (m1 - m2)g / (m1 + m2), where m1 and m2 are the masses and g is the acceleration due to gravity.

Front

Define centripetal force and its role in circular motion.

Back

Centripetal force is the net force directed towards the center of a circular path, necessary for maintaining circular motion.

Front

What is the direction of the frictional force on an object moving in a circular path?

Back

The frictional force acts towards the center of the circle, opposing the tendency of the object to move in a straight line.

Front

Explain the concept of net force in dynamics.

Back

Net force is the vector sum of all forces acting on an object, determining its acceleration according to Newton's second law.