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