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Sheet Music FORM 2 CHAPTER 7 DYNAMICS
1. (a) Name Name the the force forces s shown shown in in Diagram Diagram 1.1.
(i) …………………………………..
(ii) …………………………………..
(iii) …… …………………………………..
(iv) …… …………………………………..
Diagram 1.1
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State
two
effects of force on the ball when the girl hits the ball with a hockey stick.
(i) ………………………………………………………………………………………………
(ii) ………………………………………………………………………………………………… [2
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2. A worker worker pushes pushes a sack of of rice using a trolley to to the shop shop as shown in Diagram 2.1.
Diagram 2.1 (a) If the frictional force between between the trolley and and the ground is 500 N, calculate calculate the work done by the worker.
[2 (b) A boy boy tries to push the sack of rice but the sack is too heavy for him to move. move.
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Dia Dia ram ram 2.2 (c) The worker worker carries a sack sack of rice weighing 50 50 kg upstairs. upstairs. If the mass of of the man man is kg, calculate the work done in Diagram2.2. (1 kg = 10 N)
[2 (d) The worker worker takes 5 minutes minutes to complete the work in (c). Calculate Calculate his power power..
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3. Diagram Diagram 3.1 3.1 shows shows a wooden wooden block being being pulle pulled d on a table table top. top.
Wooden block
Spring balance
Smooth table top
Diagram 3.1
(a) Name Name the forces forces acting acting on the wooden wooden block. block. (i) (i)
(b) Using , draw the direction of the frictional force acting on the wooden block in the b provided in Diagram 3.1. [1
(c) What will happen happen to the reading reading of the the spring balance balance if the same same wooden block block is p along a piece of sand paper?
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(i) Suggest
one
way on how he can reduce the force needed to push the box.
……………………………………………………………………………………………… [1
(ii) If the force needed needed to push push the box is 300 300 N. Calculate the the work done done by the man pushing the box towards the wall.
[2
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4.
Diagram Diagram 4.1 4.1 shows shows some some methods methods used used to reduce reduce frictio friction. n.
P: ………………………..
Q: ………………………..
R: …………………
Diagram 4.1 (a) Name method method P, P, Q, and R on Diagram Diagram 4.1. [3 (b) Diagram Diagram 4.2 4.2 shows some some used used tyres.
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Diagram 4.2
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(c) Diagram Diagram 4.3 4.3 shows two two persons persons walking. walking.
Diagram 4.3 (i) State one advantage of friction in this situation.
……………………………………………………………………………………………… [1 (ii) State one disadvantage of friction in this situation.
……………………………………………………………………………………………… [1
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