What does a frictionless pulley mean?
What we mean by a frictionless pulley is that the friction in the bearings of the pulley is negligible, and the pulley is free to rotate without any resistance. We don’t mean that the friction between the string and the pulley surface is negligible.
What are the two forces applied on a pulley?
The force of gravity will pull directly down, and the normal force will pull in the opposite direction of the force of gravity equal in magnitude. Tension will pull to the right in the direction of the pulley clockwise.
Does a frictionless pulley rotate?
So it needs zero torque for angular acceleration. It will rotate.
What is a pulley physics?
Pulleys are mechanisms compost by wheel and rope used to lift heavy objects onto tall heights. They change the direction of an applied force and they can even reduce the force needed to lift a weight. Pulleys systems are common used in constructions.
How do you find the tension in a frictionless pulley system?
Calculate the tension in the rope using the following equation: T = M x A. Four example, if you are trying to find T in a basic pulley system with an attached mass of 9g accelerating upwards at 2m/s² then T = 9g x 2m/s² = 18gm/s² or 18N (newtons).
What is the physics behind a pulley?
Pulleys are mechanisms compost by wheel and rope used to lift heavy objects onto tall heights. They change the direction of an applied force and they can even reduce the force needed to lift a weight.
When does tension become an active force in a weighing machine?
Tension force always pulls a body. Tension is a reactive force. It is not an active force. Tension across a massless pulley or frictionless pulley remains constant. Rope becomes slack when tension force becomes zero. The weighing machine will read the actual weight.
What is the definition of weight in physics?
Weight Definition Physics (w): It is a field force. It is the force with which a body is pulled towards the centre of the earth due to gravity. It has the magnitude mg, where m is the mass of the body and g is the acceleration due to gravity.
How does a weighing machine read the weight?
The weighing machine will read the actual weight. The weighing machine will read the apparent weight, which is more than the actual weight. The weighing machine will read the apparent weight, which is less than the actual weight. The apparent weight of the body becomes zero.