8. Diagram 8.1 shows the same student lifting two bags of different masses onto a table.
(a) Based on the observation in Diagram 8.1:
(i) Compare the difference in work done between situation L and situation M.
Work done in situation L is less than in situation M(ii) State one relationship between the mass of the bag and the time taken to lift it.
The heavier the bag, the more the time taken to lift the bag(iii) Write one inference about the bag in situation L.
Bag in L is lighter because the time taken to lift it is shorter
(b) A student lifts up three weights of different values from the floor onto a table using a spring balance. Diagram 8.2 shows three readings of the spring balance in P, Q and R.
Table 8 shows the readings of the spring balance in P, Q and R.
Spring balance | Mass of weight (kg) | Reading of spring balance (N) |
P | 10 | 100 |
Q | 15 | 150 |
R | 20 | 200 |
Table 8
(i) Based on Diagram 8.3, state the reading of the spring balance. 250N
(ii) Based on the data in Table 8, draw a line graph of the readings of the spring balance against the mass of the weight.
Transfer all points correctly : 1 markJoint all correct points smoothly : 1 mark
(iv) State the variable involved in this activity.
Responding variable | Reading of spring balance |
Manipulated variable | Mass of weight |
(c) (i) State the operational definition of work done in Diagram 8.1.
Work done is the time taken to lift the bag
(ii) Diagram 8.4 shows four everyday activities, S, T, U and W.
Based on the operational definition of work done in 8(c)(i), classify the activities in Diagram 8.4 based on work done.
Classification | Activities |
Work done | S, U |
No work done | T, W |
*********The End*********
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