Page 90 - Physics

Physics for Secondary Schools

Acti vity 4.4
Aim: To determine density of lead shots.

Materials: Density bottle, lead shots and water

m m m m
0 1 2 3
Figure 4.6
Procedure
1. Find the mass m of density bottle when empty.
0
2. Put some lead shots in the bottle, then fi nd the mass, m of a bottle and lead shot.
1
3. Pour water into the bottle until it is full. Find the mass, m of a bottle, lead shot and
2
water.
4. Finally, fi nd the mass, m when the bottle is fi lled with water only, Figure 4.6
3
illustrates the procedure.

Results
(
Mass of lead shots = m - m ) g
1
0
(
Mass of water on top of lead shots = m - m ) g
1
2
(
Mass of water fi lling the bottle = m - m ) g
3
0
Volume of lead shots if the density of water is 1.0 g / cm will be
3
(
⎡ ( m - m ) - m - m ) g
⎤
(
(
3
V = ⎣ 3 0 2 1 ⎦ = m - m ) - m - m ) cm .
1 g / cm 3 3 0 2 1
Mass of lead shots
∴ Density =
Volume of lead shots
( m - m )
Density of lead shot
Therefore, density of lead shots = 1 0 g / cm .
3
(
( m - m ) - m - m )
1
0
3
2
84
Student’s Book Form One

Physics Form 1 Final.indd 84 16/10/2024 20:56