Chapter 10 : SIMPLE MACHINE PAPER 2 1 Figure 1 shows a wheelbarrow. (PMR 2005) Figure 1.1 (a) On Figure 1.1, label the position of the fulcrum. (1 mark) (b) (i) Based on Diagram 1.1, state the class of lever of the wheelbarrow. ______________________________________________________________ (1 mark) (ii) Give one reason for your answer in (b)(i). __________________________________________________ __________ (1 mark) (c) Based on Figure 1.2, choose one tool with the same class of lever as the wheelbarrow in Figure 1.1. Mark ( ) in the box for the tool. Fishing rod Nutcracker Pliers Prepared by : Lau SC 2012
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Chapter 10 : SIMPLE MACHINE
PAPER 2
1 Figure 1 shows a wheelbarrow. (PMR 2005)
Figure 1.1
(a) On Figure 1.1, label the position of the fulcrum.(1 mark)
(b) (i) Based on Diagram 1.1, state the class of lever of the wheelbarrow.
(i) Second class lever(ii) Load is between fulcrum and effort.
Nutcracker
40 x 20 = 100 x P 800 = 100P 8N = P
PMR 2007
2(a)
(b)
(c)
(d)
(i) First class lever(ii) The fulcrum is between the effort and load / The fulcrum is in the middle
The longer the distance of the effort from the fulcrum, the less effort is required.
Force / E
L / Load F / Fulcrum
W x 100 = 50 x 20 W = 10 N
Prepared by : Lau SC 2012
fulcrum
Chapter 10 : SIMPLE MACHINE
(e) Distance of the applied force from the fulcrum is longer. / Distance of the load from the fulcrum is shorter.
PMR 2008
3(a)
(b)
(c)
Able to state one characteristic of any three devices.P : Load is between effort and fulcrum.Q : Effort is between load and fulcrum.R : Fulcrum is between effort and load.S : Fulcrum is between effort and load.
Common characteristics
Devices
(i) The length of the crow bar influences the force needed to lift the rock.(ii) 100 N(iii) The longer the length of the crow bar, the less force needed to lift the rock.