MANDATORY EXPERIMENTS: 2. To show that acceleration is proportional to the applied force 3. Verification of the principle of conservation of momentum 4. Measurement of ‘g’ by free fall
ACTIVITIES: Demonstration of principle of conservation of momentum Gravity (Calculation of weight on different planets) Gravity (Comparison of gravitational force between Earth and Sun and between Earth and Moon)
SCIENCE,TECHNOLOGY AND SOCIETY: Conservation of momentum (collisions in ball games, acceleration of spacecraft) Applications of Newton’s laws (seatbelts, rocket travel, sports) Solar System Presence of atmosphere due to gravity Terminal velocity Importance of friction (walking, driving, use of lubricants)
PHYSICAL QUANTITIES INTRODUCED IN THIS CHAPTER: Quantity mass
Symbol Name of SI unit kilogram
momentum force
acceleration due to gravity weight
gravitational constant gravitational field strength
m p F g
W G g
kilogram metre per second newton
metre per second squared newton
newton per kilogram
Symbol for unit kg
kg m s1 N
m s2 N
newton metre squared per kilogram squared N m2 kg2 N kg1