(1) (c)
The experiment was done three times
The mass of copper oxide used and the mass of copper made was measured each time
The results are shown in the table
Experiment
1
2
3
Mass of copper oxide used
4.0
4.0
4.0
in 9
Mass of copper made ing
3.3
3.5
3.2
Calculate the mean mass of copper made in these experiments
Mean mass of copper made
(1)
(1) Suggest how the results of these experiments could be made more precise
(1)
(it) The three expenments gave slightly different results for the mass of copper made
This was caused by experimental error.
Suggest two causes of experimental error in these experiments
1.
2.

clarify the questions please.

answersilicon (si); oxygen (o);

(newtons first law)

conservation of momentum law states :

momentum before collision = momentum after collision

momentum p (kg-m/s)= mass * velocity

say moving car=1 000 kg, velocity = 10 m/s then p = 1 000*10= 10 000 kg-m/s

say still car = 2 000 kg, velocity = 0 m/s then p = 2 000* 0 = 0 kg-m/s

total momentum prior to collision = 10 000 + 0 = 10 000 kg-m/s

momentum after collision = 10 000 kg-m/s

mass now = 1 000 kg+2 000 kg = 3 000 kg

10 000 = 3 000 kg* velocity m/s

10 000/3 000 = velocity

3.33 m/s = velocity after collision

an impulse is a force applied over time , momentum is exclusive of external forces and a perfect collision is implied