Simple Machine Pulleys

This diagram shows a moveable pulley system.When moving a load, this pulley system changes the...?

• Direction of force

• Amount of force needed

• pull of gravity

• overall mass of rope

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

How is a 2-pulley system more beneficial than a 1-pulley system?

• It provides greater directional advantage

• It provides less directional advantage

• It provides less mechanical advantage

• It provides greater mechanical advantage

Tags

NGSS.MS-ETS1-2

What kind of advantage does a moveable pulley provide to lift a 100-lb hay bale?

• It will reduce the effort needed to lift the hay bale.

• It will provide no advantage.

• It will increase the mass of the hay bale.

• It will decrease the distance the hay bale will travel.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

What type of pulley is this?

• Block and tackle

• Movabil

• Fixed

• Moveable

How does adding a second pulley to a system change the force needed?

• It cuts the force needed in half.

• It doubles the force needed.

• The force needed isn’t changed.

• It triples the force needed.

What is a formula to calculate the MA (mechanical advantage) of a pulley?

• MA= height/width

• MA= displacement of load / displacement of effort

• MA= radius of fixed pulley /radius of movable pulley

• MA= the number of ropes on the movable pulley

Explain how using a pulley system with multiple pulleys can be advantageous compared to a single pulley.

• It requires more effort

• It decreases the mechanical advantage

• It allows lifting heavier loads with less effort

• It is more complicated to set up but offers no real advantage

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DOK Level 3: Strategic Thinking

Consider a scenario where you need to lift a heavy box onto a high shelf. Which simple machine would be most effective and why?

• A lever, because it can be used to pry the box upward

• A pulley, because it can change the direction of the force applied, making lifting easier

• An inclined plane, because it reduces the effort needed by increasing the distance over which the force is applied

• A wheel and axle, because it allows for easier transportation across a flat surface

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DOK Level 3: Strategic Thinking

A pulley system with 3 supporting ropes will have a mechanical advantage of:

• 1

• 2

• 3

• 4

Tags

NGSS.MS-ETS1-1

How is a single fixed pulley useful?

• It reduces the amount of work that is done

• It reduces the amount of force that is exerted

• It changes the direction in which a force is exerted

• It reduces the distance over which a force is exerted