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Physics Form 4 Chapter 2 Force and Motion I

I Non-elastic collision
Procedure:
Ticker
Ticker Timer
tape Trolley A Trolley B
Plasticine
Friction compensated
inclined plane

12 V a.c. power Support
supply
Figure 2.58
1. The apparatus is arranged as shown in Figure 2.58.
2. The inclined plane is adjusted to be friction compensated. When this is achieved, the trolley given Chapter
a slight push will move down the inclined plane with a uniform velocity which can be confirmed
by analysing the ticker tape attached to the trolley.
3. Trolley A and B are weighed to determine their mass. The values are recorded. 2
4. The ticker timer is switched on and trolley A is given a slight push to move towards the stationary
trolley B.
5. Trolley A then collides with trolley B and both stick together and move down the inclined plane.
6. The ticker tape is analysed to determine the velocity before and after collision, u and v respectively.
These values are recorded.
7. 2 other trolleys are weighed and the experiment is repeated with
(a) 1 trolley colliding with 2 stationary trolleys,
(b) 2 trolleys colliding with 1 stationary trolley, and
(c) 3 trolleys colliding with 1 stationary trolley,

Results:
Table 2.5
Before collision After collision
Mass of Velocity, Total momentum, Jisim troli Velocity, Mass of trolley
trolley, u / m s –1 m 1 u / kg m s –1 (m 1 + m 2 ) u / m s –1 momentum,
m 1 / kg / kg (m 1 + m 2 ) v / kg m s –1
1 1 + 1 = 2
1 1 + 2 = 3
2 2 + 1 = 3
2 3 + 1 = 4
Conclusion:
The total momentum before collision is the same as that of after collision. The hypothesis is accepted.
II Elastic collision
Procedure:
Ticker timer Ticker Springed
tape dowel rod
Trolley A
Trolley B Friction compensated
inclined plane

12 V a.c. power Support
supply
Figure 2.59

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