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Force Lab
SPH3U1/3/6
Reference Pages:
Workbook: 38 - 39
Review of Newton’s First Law
• When an object is obeying Newton’s First Law, what
do you know about the forces acting on the object?
8 N
5 N
10 N
2 N
5 N
6 N
N
S
W E
• Now, consider the FBD above.
• Does it obey Newton’s First Law?
• What type of motion will the object have?
Lab Description – Part A
• There are two parts: Part A and Part B
• Part A deals with 2 forces in equilibrium. The setup
for Part A is shown in the diagram below.
TAPE
TAPE
TAPE
TAPE
ELASTICSCALE SCALE
Part A – Two Forces
Lab Description – Part B
• Part B deals with 3 forces in equilibrium. The setup
for Part B is shown in the diagram below.
TAPE
TAPE
TAPE
TAPE
ELASTIC
SCALE
SCALE
SCALE


 ENSURE
Use Ruler to Draw Line
Down Centre of Paper
Lab Materials Required
(At front desk)
Materials
Required
Quantity Materials
Required
Quantity
Ruler &
Protractor
1 each String – 60 cm
per piece
2 pieces
Large Paper
11” x 17”
1 Elastic Bands 1
Masking
Tape
As required Force Scales 3
Review of Lab Safety and Procedures
• For Part B, get two sets of data (all angles must be
different).
• Please work responsibly and do not fool around.
• Use the scales properly:
– Do not overextend the springs
– Try to obtain readings that require a deflection of
about one quarter to three quarters as measured on
the scale.
– Readings should be in Newtons (not grams)
• Record your data on the working paper taped to
your desk. Keep this paper at the end of the lab!
• Clear your desk before starting and spend a minute
to re-read the lab instructions in the workbook.
Teacher Demonstrations
• Making a loop at each end of the string.
• Tie string to elastic
• Use of spring scale and calibration of scale.
• Comment on the two types of scales.
• Students may now get materials from front
desk and start lab.
Wrap Up
(At end of lab)
• Requirements for the lab report can be found
on the website (found at the bottom of the
Unit 1b – Forces page):
• https://docs.google.com/viewer?a=v&pid=sites&srcid=ZGVmYXVsdGRvbWFpbnxnc
nVzemVja2kzfGd4OjMxYWU1MTFiYzdhOWU4MjE
Part B Clarification
• See diagram on the next slide and discuss with
class.
Part B
F 1
F 2


F 1
F 2
R
TWO FORCES ADDING TWO FORCES
SCALE: 1 cm = 1 N



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Force Lab

  • 2. Review of Newton’s First Law • When an object is obeying Newton’s First Law, what do you know about the forces acting on the object? 8 N 5 N 10 N 2 N 5 N 6 N N S W E • Now, consider the FBD above. • Does it obey Newton’s First Law? • What type of motion will the object have?
  • 3. Lab Description – Part A • There are two parts: Part A and Part B • Part A deals with 2 forces in equilibrium. The setup for Part A is shown in the diagram below. TAPE TAPE TAPE TAPE ELASTICSCALE SCALE Part A – Two Forces
  • 4. Lab Description – Part B • Part B deals with 3 forces in equilibrium. The setup for Part B is shown in the diagram below. TAPE TAPE TAPE TAPE ELASTIC SCALE SCALE SCALE    ENSURE Use Ruler to Draw Line Down Centre of Paper
  • 5. Lab Materials Required (At front desk) Materials Required Quantity Materials Required Quantity Ruler & Protractor 1 each String – 60 cm per piece 2 pieces Large Paper 11” x 17” 1 Elastic Bands 1 Masking Tape As required Force Scales 3
  • 6. Review of Lab Safety and Procedures • For Part B, get two sets of data (all angles must be different). • Please work responsibly and do not fool around. • Use the scales properly: – Do not overextend the springs – Try to obtain readings that require a deflection of about one quarter to three quarters as measured on the scale. – Readings should be in Newtons (not grams) • Record your data on the working paper taped to your desk. Keep this paper at the end of the lab! • Clear your desk before starting and spend a minute to re-read the lab instructions in the workbook.
  • 7. Teacher Demonstrations • Making a loop at each end of the string. • Tie string to elastic • Use of spring scale and calibration of scale. • Comment on the two types of scales. • Students may now get materials from front desk and start lab.
  • 8. Wrap Up (At end of lab) • Requirements for the lab report can be found on the website (found at the bottom of the Unit 1b – Forces page): • https://docs.google.com/viewer?a=v&pid=sites&srcid=ZGVmYXVsdGRvbWFpbnxnc nVzemVja2kzfGd4OjMxYWU1MTFiYzdhOWU4MjE Part B Clarification • See diagram on the next slide and discuss with class.
  • 9. Part B F 1 F 2   F 1 F 2 R TWO FORCES ADDING TWO FORCES SCALE: 1 cm = 1 N  