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Quiz Chapter 8: Force and Motion

10 questions · Form 2 Science Bab 8: Force and Motion

Question 1 of 10Score: 0

A balanced seesaw has a 300 N child sitting 2.0 m to the left of the pivot. How far from the pivot must a 400 N child sit on the right side to maintain balance?

Full Question List & Answer Key

Prefer reading to quizzing? All 10 questions are listed below with the answer and explanation under each one.

1. A balanced seesaw has a 300 N child sitting 2.0 m to the left of the pivot. How far from the pivot must a 400 N child sit on the right side to maintain balance?

  1. 1.5 m
  2. 2.6 m
  3. 1.0 m
  4. 3.0 m
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Answer: A

Principle of Moments: Anticlockwise Moment = Clockwise Moment. 300 N × 2.0 m = 400 N × distance. Distance = 600400 = 1.5 m.

2. Which instrument is used in the laboratory to measure the magnitude of a force?

  1. Bourdon gauge
  2. Spring balance
  3. Micrometer screw gauge
  4. Ammeter
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Answer: B

A spring balance (dynamometer) measures force based on the extension of an elastic spring proportional to the force applied.

3. Why does a suction cup stick firmly to a smooth glass window when pressed flat against it?

  1. Air inside cup expands and pulls the cup
  2. Air is squeezed out, creating a low pressure zone inside; higher external atmospheric pressure holds it in place
  3. Static electricity glues the rubber to glass
  4. Glass exerts high normal force pushing it inward
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Answer: B

Pressing the cup removes air inside, creating a partial vacuum; higher atmospheric pressure outside presses the cup tightly against the glass.

4. Which tool acts as a Third Class Lever?

  1. Pliers
  2. Nutcracker
  3. Fishing rod
  4. Seesaw
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Answer: C

A fishing rod is a third class lever (F - E - L), where effort is applied by the hand between the handle pivot and the load at the line tip.

5. Why are wide, continuous tracks used on heavy army tanks instead of standard narrow rubber tires?

  1. To increase friction with the ground
  2. To reduce pressure on soft ground by spreading heavy weight over a larger area
  3. To increase total weight of the tank
  4. To lower engine temperature
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Answer: B

Wide tracks increase ground contact surface area, lowering pressure (P = FA) so heavy vehicles do not sink into soft terrain.

6. Which set of items belongs to First Class Levers (Pivot located between Load and Effort)?

  1. Wheelbarrow and bottle opener
  2. Scissors and crowbar
  3. Tweezers and fishing rod
  4. Ice tongs and broom
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Answer: B

In scissors and crowbars, the fulcrum (pivot) lies between the effort point and the load point (L - F - E).

7. Which type of force always acts directly opposite to the direction of motion between two moving touching surfaces?

  1. Gravitational force
  2. Frictional force
  3. Normal force
  4. Buoyant force
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Answer: B

Frictional force resists relative motion and acts in the direction opposite to movement.

8. An object floats in water when the upward buoyant force is equal to what quantity?

  1. Atmospheric pressure
  2. Weight of the object (gravitational force)
  3. Frictional force of water
  4. Surface area of the object
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Answer: B

An object floats in equilibrium when the upward buoyant force equals the downward weight (gravitational force) of the object.

9. In a second class lever, what is the position of the Load relative to the Pivot and Effort?

  1. Load is between Pivot and Effort
  2. Pivot is between Load and Effort
  3. Effort is between Load and Pivot
  4. Load and Effort are at the exact same location
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Answer: A

In second class levers (F - L - E), the Load is located between the Pivot and the Effort (e.g., wheelbarrow).

10. A force of 200 N acts perpendicularly on a surface area of 2 m². What is the resulting pressure exerted on the surface?

  1. 400 Pa
  2. 100 Pa
  3. 0.01 Pa
  4. 202 Pa
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Answer: B

Pressure P = Force / Area = 200 N2 m² = 100 Pa (or Nm²).

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