Physics Work & Simple Machines

Force is a function of mass an acceleration and is measured by what type of unit?

• degree

• hertz

• joule

• newton

What is an example of work being performed?

• pushing against a stationary wall

• holding a 100 pound bar bell

• pushing a lawn mower 100 yards

• marching in place

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NGSS.MS-PS3-5

Jose and Joshua are tossing similar rocks across the surface of a pond. When Jose throws a small rock, the rock travels a long distance. When Joshua throws a large rock, the rock travels a very short distance. Which statement describes the work in this scenario?

• Work is done on both rocks.

• Work is not done on both rocks.

• Work is done on the rock Jose threw but not on the rock thrown by Joshua.

• Work is done on the rock Joshua threw but not on the rock thrown by Jose.

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NGSS.MS-PS3-5

Which action would require no work to be done on an object?

• pushing an object across the floor of a room

• lifting an object from the floor of a room

• holding an object still above the floor of a room

• dropping an object form a height above the floor of a room

Jonathan pushes his toy truck across the floor. The movement of the toy requires him to do work. What must Jonathan use to do the work needed to move his toy truck across the floor?

• energy

• mass

• matter

• space

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NGSS.MS-PS3-1

NGSS.MS-PS3-5

Which statement is true regarding a simple machine?

• A simple machine requires the user to apply a greater force over a larger distance to do work.

• A simple machine is a device that increases the amount of force required to do work.

• The design of a simple machine can reduce the amount of force required to do work.

• The design of a simple machine does not change the amount of force needed to do work.

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NGSS.MS-PS2-2

Aubrey, Olivia, and Amanda are all Scouts. While on a trip, each girl has one task to complete each day. Aubrey needs to attach and raise the flag on the flagpole, Olivia needs to chop 10 pieces of wood for a fire, and Amanda needs to rake up small sticks to start the fire.

Which three simple machines should the Scouts use to accomplish their tasks?

• inclined plane, pulley, and wheel and axle

• lever, wedge, and inclined plane

• pulley, lever, and wedge

• screw, lever, and wedge

Which simple machine is used to separate two objects or two parts of the same object?

• lever

• pulley

• screw

• wedge

A farmer needs to pull his tractor out of the mud. He believes the best solution is to use a simple machine that will increase the distance the effort force has to move to pull the tractor relative to the distance the weight of the tractor has to move.

Which simple machine should the farmer use to pull his tractor out of the mud?

• inclined plane

• lever

• pulley

• wheel and axle

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NGSS.MS-PS2-2

A car is moving on a straight road when it runs out of fuel and comes to a stop. The driver of the car pushes it to the side of the road.

Which example is evidence that the driver possessed energy?

• the car moving due to the force of gravity

• the friction force stopping the moving car

• the mass of the car decreasing due to the motion of the car

• the force applied by the driver causing the motion of the car

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NGSS.MS-PS3-5