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Checkpoint Science

Home > Study Notes > Checkpoint Science
Published in: Physics | Science
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Physics Questions

Tan C / Kuching

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Qualification: Degree

Teaches: Mathematics, Physics, Science, Additional Math, Chemistry, Additional Maths

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  1. [Pick the date] NAM ENFORCEMENT TEST 1 Fig.3.1 shows a simple see-saw. One child A sits near to end X and another child B sits near to end Y. The feet of the children do not touch the ground when the see-saw is balanced. x Fig. 3.1 pivot (a) Child A has a mass of 18.0kg and child B has a mass of 20.0kg. Without calculation, indicate where the children could sit so that the see-saw balances horizontally. You may draw on Fig.3.1 if you wish. [2] (b) State the relationship between the moment caused by child A and that caused by child B. [1] (c) Child A is 2.50m from the pivot Calculate the distance of child B from the pivot distance = Year 9 Science
  2. [Pick the date] NAM ig. 2.1 shows apparatus for investigating moments of forces. o spring balance O 30 horizontally balanced metre rule o 40 o 60 O 70 o 80 o 10 20 6.ON weight 50 Fig. 2.1 100 horizontal pivot The uniform metre rule shown in Fig. 2.1 is in equilibrium. (a) Write down two conditions for the metre rule to be in equilibrium. condition 1 condition 2 (b) Show that the value of the reading on the spring balance is 8.0N. [2] (c) The weight of the uniform metre rule is 1.5N. Calculate the force exerted by the pivot on the metre rule. magnitude of force = direction of force Year 9 Science
  3. [Pick the date] NAM a) A man squeezes a pin between his thumb and finger, as shown in Fig. 6.1. finger pinhead pin thumb Fig. 6.1 The finger exerts a force of 84 N on the pinhead. The pinhead has an area of 6.0 x 10-5 m2. (i) Calculate the pressure exerted by the finger on the pinhead. pressure = (ii) State the value of the force exerted by the pin on the thumb. (iii) Explain why the pin causes more pain in the man's thumb than in his finger. [2] Year 9 Science
  4. [Pick the date] NAM a) Some water is poured onto a plastic table-top, forming a puddle. The same volume of water is poured into a plastic dish, which is placed alongside the puddle. This is illustrated in Fig. 7.1. water in puddle Fig. 7.1 Both lots of water begin to evaporate. water in dish (i) In terms of the behaviour of molecules, describe what happens during the process of evaporation. [2] (ii) Explain why the puddle dries out more rapidly than the water in the dish. [2] (iii) State two changes that would make both lots of water evaporate more rapidly. 1. 2. Year 9 Science [2]
  5. [Pick the date] NAM a) A uniform metre rule is pivoted at its centre, which is also the position of its centre of mass. Three loads, 2.0 N, F and 3.0 N are positioned on the rule at the 20 cm, 30 cm and 90 cm marks respectively, as shown in Fig. 3.1. 0 cm 20cm 30cm 2.0 N 50 cm pivot Fig. 3.1 90cm "100cm 3.ON (i) Calculate the moment of the 3.0 N load about the pivot moment = . (ii) Calculate the moment of the 2.0 N load about the pivot moment = . (iii) The force F maintains the metre rule in equilibrium on the pivot Calculate the value of F. (b) The weight of the metre rule is 1.2 N and can be considered to act at the 50 cm mark. All the weights in (a) are removed. The pivot is positioned under the 30 cm mark and the 2.0 N load is placed on the rule as shown in Fig. 3.2. 30cm pivot 20N 50 cm Fig. 3.2 The position of the 2.0 N load is adjusted until the metre rule is again in equilibrium. Determine the position of the 2.0 N load. 2.0 N load is at the . Year 9 Science . cm mark [3]
  6. [Pick the NAM date] a) State the two conditions required for the equilibrium of a body acted upon by a number of forces. (b) Fig. 3.1 shows a diagram of an arm with the hand holding a weight of 120 N. 2 cm 15cm 20 N 120N 33 cm Fig. 3.1 The 20 N force is the weight of the forearm, acting at its centre of mass. F is the force in the muscle of the upper arm. P is the point in the elbow about which the arm pivots. The distances of the forces from point P are shown. (i) By taking moments about point P, calculate the force F. force F = (ii) A force acts on the forearm at point P. Calculate this force and state its direction. force = direction = ..... ..... .................... ..... Year 9 Science
  7. [Pick the NAM date] n astronaut has a mass of 65 kg on Earth, where the gravitational field strength is 10 N / kg. (a) Calculate the astronaut's weight on Earth. weight on Earth = (b) Complete the following sentence. The astronaut's weight on Earth is the ..... ..... ......................................................... force between the astronaut and ................................. (c) The astronaut undertakes a Moon landing. On the Moon the gravitational field strength is 1.6 N / kg. (i) State the astronaut's mass on the Moon. mass = (ii) Calculate the weight of the astronaut on the Moon. weight on Moon = ..... ..... ............................... Year 9 Science
  8. [Pick the date] NAM soldier wears boots, each having an area of 0.016 m2 in contact with the ground. The soldier weighs 720 N. (a) (i) Write down the equation that is used to find the pressure exerted by the soldier on the ground. (ii) Calculate the pressure exerted by the soldier when he is standing to attention, with both boots on the ground. pressure = (b) The soldier is crossing a sandy desert Explain, stating the relevant Physics, why this soldier is at an advantage over another soldier who has the same weight but smaller feet (c) The soldier's unit is sent to a cold country, and on one occasion he has to cross a frozen lake. Suggest one way that the soldier can reduce the risk of the ice breaking under his weight Year 9 Science
  9. [Pick the date] NAM Fig. 3.2 shows a uniform rod PQ, supported at its centre and held in a horizontal position. The length ofPQ is 1.00 m. 1.00m 0.30m 12N Fig. 3.2 s force of 12 N acts ata distance of 0.30 m from the support A spring S, fixed at its lower end, is attached to the rod at Q. (i) Calculate the force exerted on PQ by the spring. force = (ii) Explain why it is not necessary to know the weight of PQ. Year 9 Science
  10. [Pick the date] NAM Mercury is poured into a U-shaped glass tube. Water is then poured into one of the limbs of the tube. Oil is poured into the other limb until the surfaces of the mercury are at the same level in both limbs. oil water 0.32m 0.25m mercury Fig. 3.2 (i) State a condition that must be true in order for the mercury surfaces to be at the same level in both limbs of the tube. (ii) The height of the water column is 0.25 m. The height of the oil column is 0.32 m. The density of water is 1000 kg / m3. Calculate 1. the pressure exerted by the water on the surface of the mercury, pressure = 2. the density of the oil. density Year 9 Science
  11. [Pick the date] NAM Fig. 1.2 shows a kitchen cupboard resting on a support and attached to a wall by a screw. wall 0.75m support crew cupboard . 024m 75N Fig. 1.2 The weight of the cupboard and its contents is 75 N. G is the position of the centre of mass of the cupboard. The clockwise and anticlockwise moments about point P are equal. Calculate the force F exerted by the screw. Year 9 Science
  12. [Pick the NAM date] ig. 2.1 shows a uniform, rectangular slab of concrete ABCD standing upright on the ground. The slab has height 0.60 m, width 0.30 m and mass 18 kg. A force of 40 N acts horizontally to the left at B. moment = ..... ..... .............................................. [3] 0.60m 40 N •c 0.30m Fig. 2.1 (a) (i) Calculate the weight W of the concrete slab. (ii) The thickness of the slab is 0.040 m. Calculate the pressure exerted by the slab on the ground. pressure = (b) (i) On Fig. 2.1, draw and label an arrow to show the weight W of the slab acting at its centre of mass. [1] (ii) Calculate 1. the moment of the 40 N force about point D, moment = .. 2. the moment of W about point D. (iii) The ground is rough so that the slab does not slide. State and explain what happens to the slab as the horizontal force at B is gradually increased. Year 9 Science

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