Simple Tools and Work

Which is the best example of a first-class lever?

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Which yard tool has a wheel and axle that helps move a pile of dirt?

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Tags

NGSS.MS-PS2-1

Which statement best describes work being done on an object?

• Two equal, but opposite, forces are applied to an object.

• A force is applied to an object and the object remains stationary.

• The frictional force on an object is greater than a pushing force applied to the object.

• A force is applied to an object, and the object moves in the same direction as the force.

Tags

NGSS.MS-PS3-5

Which circuit is most likely able to conduct electricity?

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A wheelbarrow is a compound machine. Which simple machines are used to form this compound machine?

• lever, pulley

• lever, wheel and axle

• inclined plane, wedge

• wedge, wheel and axle

Shown above is a parallel circuit of two light bulbs. Which statement best describes what will most likely happen if Bulb 1 burns out?

• Bulb 2 will also burn out.

• Bulb 2 will blink off and on.

• Bulb 2 will stay lit, but will be a dimmer light source.

• Bulb 2 will stay lit and the light source will be stronger.

The image above shows three inclined planes built at the same height, but with different lengths. Which statement is true about these inclined planes?

• The shorter ramp will provide the most mechanical advantage making work the easiest

• The longer ramp will provide the most mechanical advantage making work the easiest

• The longer ramp will provide the least mechanical advantage making work the harder

• The medium length ramp will provide the most mechanical advantage making work the easiest

Which best describes a lever?

• a simple machine that consists of an inclined plane wrapped around a cylinder

• a simple machine consisting of a sloping surface connecting higher and lower elevations

• a simple machine that consists of a bar that rotates around a fixed point called a fulcrum

• a simple machine that consists of two connected rings or cylinders, which turn in the same direction around a single center point

A circuit consists of four light bulbs connected in a row. If the first light bulb burns out, what will most likely happen to the other light bulbs?

• The other light bulbs will also go out.

• The other light bulbs will blink on and off.

• The other light bulbs will become 33% brighter.

• The other light bulbs will become 25% dimmer.

Which is the best example of a compound machine?

• ax

• car

• screw

• ramp