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CIE iGCSE Co-Ordinated Science P1.5.3 Centre of gravity Exam Style Questions Paper 2

CIE iGCSE Co-Ordinated Science Paper 2 - All Chapters

Question

A student labels an object with four possible positions for the centre of gravity.

Which position for the centre of gravity makes the object the most stable?

▶️ Answer/Explanation
An object is most stable when its centre of gravity is as low as possible and positioned centrally over its base of support. Looking at the diagram, position D is the lowest point on the object, giving it the lowest centre of gravity. This increases stability because a lower centre of gravity makes it harder for the object to topple over when tilted. Positions A, B, and C are higher up, making the object less stable.
✅ Answer: (D)

Question

The diagram shows the apparatus that a student uses to determine the centre of gravity of a piece of card.

The student:

  • makes several holes in the card
  • suspends the card from a pin placed through one of the holes
  • hangs a load from a thread attached to the pin
  • marks the line of the thread on the card.

The student repeats the steps using a different hole each time.

What is the smallest number of lines that the student needs to draw to determine the position of the centre of gravity of the card?

A. 1
B. 2
C. 3
D. 4

▶️ Answer/Explanation
The centre of gravity of an irregularly shaped object can be found by suspending it from different points. The vertical line through each suspension point is marked. The intersection point of at least two such lines gives the centre of gravity. Two lines are sufficient to determine the intersection point, while a third line can be used to confirm the position.
✅ Answer: (B)

Question

A plant was placed horizontally in complete darkness.
The diagram shows how the plant had grown after one week.

Which response has the shoot made?
(A)  gravitropism away from gravity
(B)  gravitropism towards gravity
(C)  phototropism away from light
(D)  phototropism towards light

▶️Answer/Explanation

Ans: A

Question

A uniform beam of length 20 cm is balanced on a pivot at its centre.
A 20 N load is placed at one end of the beam and a 30 N load is placed at the other end.
A 25 N load is also placed on the beam to balance it.

How far from the pivot is the 25 N load placed?
(A)  4.0 cm

(B)  5.0 cm

(C)  8.0 cm

(D)  10 cm

▶️Answer/Explanation

Ans: A

Question

A person uses a bar that is 3.0 m long to lift a rock of weight 900 N off the ground. There is a pivot under the bar at 0.50 m from the rock.
The person pushes vertically downwards on the other end of the bar from the rock, as shown.

Ignore the weight of the bar.
What is the minimum force needed to lift the rock off the ground?
(A)  150N

(B)  180N

(C)  4500N

(D)  5400N

▶️Answer/Explanation

Ans : B

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