Sci. 8- Mechanical Systems: Section 2.2 The Science of Work & 2.3 The Big Movers-Hydraulics

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The scientific definition of work is ... “Work is done when a force acts on an object to make
the object move.” Which statement below describes work being done.

Hank worked very hard to get all his homework done.

Doing math is hard work if you don’t like numbers.

It was hard work for Sam to move the desk two meters.

It was hard work trying to move the car, but it wouldn’t budge.

Work is calculated using the formula W = F x d. If you lift a box onto your desk that is 0.4 meters off the floor, using 50 Newtons of force, how much work are you doing?

20 Joules

125 Joules

50.4 Joules

49.6 Joules

In a car, what provides the force (energy source) that makes work (the car moving) possible?

engine

transmission

gasoline

wheels

Using a machine does not mean that less work is done. This is because ...

Work input is never equal to work output

Work input is equal to work output

Less force means less distance

More force means more distance

When determining the efficiency of a certain machine, the students found that 1600J of work were needed to get 1200J of work from the machine. The efficiency of this machine was ...

2800 J

400 J

75%

25%

What is a pascal? What does it measure? (pg. 294)

How do the sizes of the pistons affect the pressure in a hydraulic system? (pg. 295 & 298)

Describe how forces are transferred in a fluid. (pg. 298)

Calculate the pressure on the fluid in a hydraulic jack that has a piston area of 16cm2 and to which you apply a force of 400 N. Use the formula: p = F/A
Example:

Be mindful of your units in your answer.

The scientific definition of work is ... “Work is done when a force acts on an object to make
the object move.” Which statement below describes work being done.

Hank worked very hard to get all his homework done.

Doing math is hard work if you don’t like numbers.

It was hard work for Sam to move the desk two meters.

It was hard work trying to move the car, but it wouldn’t budge.

Work is calculated using the formula  W = F x d. If you lift a box onto your desk that is 0.4 meters off the floor, using 50 Newtons of force, how much work are you doing?

20 Joules

125 Joules

50.4 Joules

49.6 Joules

In a car, what provides the force (energy source) that makes work (the car moving) possible?

engine

transmission

gasoline

wheels

Using a machine does not mean that less work is done. This is because ...

Work input is never equal to work output

Work input is equal to work output

Less force means less distance

More force means more distance

When determining the efficiency of a certain machine, the students found that 1600J of work were needed to get 1200J of work from the machine. The efficiency of this machine was ...

2800 J

400 J

75%

25%

Sci. 8- Mechanical Systems: Section 2.2 The Science of Work & 2.3 The Big Movers-Hydraulics

Sci. 8- Mechanical Systems: Section 2.2 The Science of Work & 2.3 The Big Movers-Hydraulics

What is a pascal? What does it measure? (pg. 294)

How do the sizes of the pistons affect the pressure in a hydraulic system? (pg. 295 & 298)

Describe how forces are transferred in a fluid. (pg. 298)

Calculate the pressure on the fluid in a hydraulic jack that has a piston area of 16cm2 and to which you apply a force of 400 N. Use the formula: p = F/AExample:Be mindful of your units in your answer.

The scientific definition of work is ... “Work is done when a force acts on an object to makethe object move.” Which statement below describes work being done.

Work is calculated using the formula W = F x d. If you lift a box onto your desk that is 0.4 meters off the floor, using 50 Newtons of force, how much work are you doing?

In a car, what provides the force (energy source) that makes work (the car moving) possible?

Using a machine does not mean that less work is done. This is because ...

When determining the efficiency of a certain machine, the students found that 1600J of work were needed to get 1200J of work from the machine. The efficiency of this machine was ...

What is a pascal? What does it measure? (pg. 294)

How do the sizes of the pistons affect the pressure in a hydraulic system? (pg. 295 & 298)

Describe how forces are transferred in a fluid. (pg. 298)

Calculate the pressure on the fluid in a hydraulic jack that has a piston area of 16cm2 and to which you apply a force of 400 N. Use the formula: p = F/AExample:Be mindful of your units in your answer.

Calculate the pressure on the fluid in a hydraulic jack that has a piston area of 16cm2 and to which you apply a force of 400 N. Use the formula: p = F/A
Example:

Be mindful of your units in your answer.

The scientific definition of work is ... “Work is done when a force acts on an object to make
the object move.” Which statement below describes work being done.

Calculate the pressure on the fluid in a hydraulic jack that has a piston area of 16cm2 and to which you apply a force of 400 N. Use the formula: p = F/A
Example:

Be mindful of your units in your answer.