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

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.

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/A

Example:

Be mindful of your units in your answer.