What is accomplished by a simple pulley?
A.) It changes the distance of the pull needed to lift the object.
B.) It changes the duration needed to lift the object.
C.) It changes the direction of the force needed to lift the object.
D.) It changes the total work done to lift the object.
E.) It gives the circus a backup plan when the trapeze artists suddenly decide to take a day off.
C. It changes the direction of the force needed to lift the object.
C.) It changes the direction of the force needed to lift the object.
The correct answer is C.) It changes the direction of the force needed to lift the object.
A simple pulley is a type of machine that consists of a grooved wheel and a rope or cable. When a force is applied to one end of the rope, it wraps around the wheel and exerts a force on the object being lifted at the other end of the rope.
By using a simple pulley, the direction of the force required to lift an object is changed. Instead of pulling or lifting the object directly, the force is applied downwards or upwards to the rope, which then pulls or lifts the object in the desired direction.
To determine this answer, you could have eliminated options A and B because a simple pulley does not change the distance or duration needed to lift the object. Additionally, option D is incorrect because a simple pulley does not change the amount of work done to lift the object, only the direction of the force. Therefore, the correct answer is C) It changes the direction of the force needed to lift the object.