Simple Machines Quiz

What is the primary mechanical advantage of using the simple machine seen in the image?

• You can apply a small input force and have it multiplied into a large output force.

• You can apply a large input distance and have it multiplied into a small output distance.

• You can apply a small input distance and have it multiplied into a large output distance.

• You can apply a large input force and have it multiplied into a small output force.

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Where should the fulcrum be located in this lever to get the greatest mechanical advantage?

• at position III, because the length of the load arm should be greater than the length of the effort arm

• at position IV, because the effort should be applied as close to the fulcrum as possible

• at position II, because the effort arm and the load arm should have equal lengths

• at position I, because the length of the effort arm should be greater than the length of the load arm

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Simple machines make work easier. Most simple machines reduce the amount of effort force needed to move an object. In this wheel and axle system, the wheel and axle is used to pull a bucket up. A person turns the handle (P), using effort force. What if the bucket is really heavy and the wheel cannot be turned? How can the effort force be reduced so the bucket can be lifted?

• Use a greater length of rope on the wheel and axle.

• Make the radius of the handle (wheel) larger in diameter.

• Make the radius of the axle larger in diameter.

• Make both the diameter of the handle (wheel) and the diameter of the axle larger.

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To lift a load of 100 N a distance of 1 m an effort of 25 N must be applied over an inclined plane of length 4 m. What must be done to lift the load 2 m, using the same effort?

• Use an inclined plane of length 10 m.

• Use an inclined plane of length 16 m.

• Use an inclined plane of length 2 m.

• Use an inclined plane of length 8 m.

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What is the primary mechanical advantage of using the simple machine seen in the image?

• You can apply a small input distance and have it multiplied into a large output distance.

• You can apply a small input force and have it multiplied into a large output force.

• You can apply a large input distance and have it multiplied into a small output distance.

• You can apply a large input force and have it multiplied into a small output force.

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How can you decrease the effort force needed to push a mass to the top of the ramp?

• increase the height of the ramp

• increase the height of the ramp

• increase the length of the ramp

• cover the surface with carpet

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What is the advantage of the system of gears shown in the image?

• The larger gear can be moved by applying a relatively small force on the smaller gear.

• The system would continue to move without any further force, after an initial force has set it in motion.

• The force applied on the smaller gear is transmitted without any loss to the larger gear.

• The direction of motion can be changed without changing the direction of the applied force.

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Sarah was attempting to pull the cart seen here through point A in the diagram. She could not do it. Her sister suggested setting up a pulley system to help Sarah with the task. The girls added the pulleys and ropes you see here. How did this pulley system help Sarah move the cart?

• The force required to move the cart is cut in half or 50 N.

• The force required to move the cart is multiple by the distance and then divided by 4.

• The force required to move the cart is 100 N/8 or 12.5 N.

• The force required to move the cart is divided by three or 33.33 N.

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The mechanical advantage of an inclined plane is the ratio of the inclined surface to the vertical height. Simple machines with greater mechanical advantage reduce the force required to lift a load. In which case is the effort required the LEAST?

• raising a 200 kg box to a height of 1 m using an inclined plane of length 4 m

• raising a 200 kg box to a height of 2 m using an inclined plane of length 8 m

• raising a 100 kg box to a height of 1 m using an inclined plane of length 5 m

• raising a 100 kg box to a height of 2 m using an inclined plane of length 6 m

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Putting effort at point IV of this lever offers no mechanical advantage because it

• requires a smaller force

• requires a greater force

• requires a smaller distance

• requires a greater distance