Docstoc

Edexcel Additional Science Topic Lesson Collins (DOC)

Document Sample
Edexcel Additional Science Topic Lesson Collins (DOC) Powered By Docstoc
					                                                  Get to work!
      Unit P2a
      Topic 10
      Lesson 1




Specification reference                                            Other lessons in this book
P2.10.4    Explain that work done is equal to energy               P2: 9.6 Falling down
           transferred.
P2.10.6    Use the equation:
           work done  force  distance moved in the
           direction of the force
           W  F  s.




                                                                                  Student Book pages to 218 to 219
                                                                                  Worksheet P2: 10.1(1)
                                                                                  Worksheet P2: 10.1(2)
                                                                                  Technician’s notes P2: 10.1




distance                        force                            joule                              mass
energy transfer                 gravitational potential          kinetic energy                     work done
                                  energy




                                                                                               Resources
 Review mass and weight. Pupils use the worksheet to revise the distinction between
   mass and weight.                                                                             Worksheet P2: 10.1(1)
 Review types of energy and energy transfers using a series of short demonstrations.           Technician’s notes P2: 10.1



Learning outcomes
 that an object can be acted on by different types of force and these will have different values
 that work done is equal to the energy transferred
                            Teaching and learning activities                                               Resources

Pupils compare the force needed to drag several objects with the force needed to lift them.     Technician’s notes P2: 10.1
Pupils can use objects of their choice, e.g. pencil cases, shoes or use objects provided.
Ask pupils to identify describe the energy transfers in each case.
Ask the pupils to answer questions 1 to 4 from the Student Book.                                Student Book page 218
Go through the answers.
Learning outcomes
 state that work done  force  distance moved in the direction of the force
 use the equation work done  force  distance moved in the direction of the force
   WFs
                               Teaching and learning activities                                            Resources

Compare work done in lifting an object up and dragging it up a slope to the same height.         Technician’s notes P2: 10.1
Ask pupils to explain:
 why a smaller force is needed to drag the object than lift it
 why using this smaller force results in more work being done overall
 why dragging up a slope might be the better method even if there is more work done
   overall.
Ask the pupils to answer questions 5 and 6 from the Student Book.                                Student Book page 219
Go through the answers.




Learning outcomes
 use the equation in a changing force context
                               Teaching and learning activities                                            Resources

Pupils do the stretching spring experiment using worksheet P2: 10.1(2) to guide them. They       Worksheet P2: 10.1(2)
plot the graph and calculate the energy stored in the spring at a particular extension. The
experiment can be limited to loads that will not exceed the elastic limit of the spring (and
                                                                                                 Technician’s notes P2: 10:1
therefore permanently stretch it) and the area to be calculated will be a triangle. If pupils
exceed the elastic limit, they will have to measure the area by counting squares.
Ask pupils to answer question 7 from the Student Book.
Go through the answers.
                                                                                                 Student Book page 219




 Ask pupils to indicate ‘Yes’ or ‘No’ for each of the following in answer to the question ‘Is this an example of doing work?’.
   –   reading a book for English (no)
   –   putting a jar of jam back on a shelf (yes)
   –   going to bed (yes)
   –   doing research using the Internet (no)
   –   playing football (yes)
 Ask pupils to suggest one energy transfer where work is done and one energy transfer where no work is done. Collect
   responses to create two lists.




            LOW DEMAND                                STANDARD DEMAND                              HIGH DEMAND
                                              5 a Weight  1.5 kg  10 m/s  15 N       7 a 300 N  1.6 m  480 J
                                                                            2
1 The construction worker is doing the
  most work                                         b 15 N  1.2 m  18 J                  b 100 N  5 m  500 J
2 Jack does the most work.
                                                    c 20  18  360 J                      c Some energy is wasted due to
3 Wayne does the most work.                                                                  frictional forces.
                                              6 a 600 N  0.15 m  90 J
4 Only movement can count as work.                                                         d Amanda might not be able to lift
  You will not have moved much, and                 b 20  90  1800 J
                                                                                             the wheelbarrow straight up.
  will have used very little force to do
  so.

				
DOCUMENT INFO