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Quiz Chapter 8: Force and Motion

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

10 questions · plays in fullscreen

Full Question List & Answer Key

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

1. What force acts perpendicular to a surface to support an object resting on a table?

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

Normal force is the reaction force exerted by a surface perpendicular to an object resting upon it.

2. Why does liquid pressure increase as a diver descends deeper into the ocean?

  1. Water temperature increases with depth
  2. The weight of the liquid column above the diver increases with depth
  3. Water density decreases at greater depth
  4. Atmospheric pressure disappears underwater
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Answer: B

Liquid pressure is caused by the weight of fluid above; deeper positions have a taller column of liquid pressing down, resulting in higher pressure.

3. 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.

4. What is the SI unit used to measure force?

  1. Joule (J)
  2. Pascal (Pa)
  3. Newton (N)
  4. Watt (W)
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Answer: C

The SI unit for force is the Newton (N), named after Sir Isaac Newton.

5. 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.

6. Which action will increase the moment of force when loosening a tight nut using a wrench?

  1. Applying force closer to the pivot
  2. Using a wrench with a longer handle and applying force at the far end
  3. Applying a smaller force perpendicular to the handle
  4. Greasing the nut to reduce handle length
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Answer: B

Moment = Force × Distance. Increasing distance from pivot by using a longer wrench increases the turning effect for the same effort.

7. A force of 50 N is applied perpendicular to a door at a distance of 0.8 m from the hinges (pivot). What is the turning moment of the force?

  1. 40 N m
  2. 62.5 N m
  3. 50.8 N m
  4. 20 N m
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Answer: A

Moment of Force = Force × Perpendicular Distance = 50 N × 0.8 m = 40 N m.

8. What happens to the gas pressure inside a fixed closed container when the temperature of the gas increases?

  1. Gas pressure decreases
  2. Gas pressure increases
  3. Gas pressure drops to zero
  4. Gas pressure remains completely unaffected
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Answer: B

Higher temperature increases the kinetic energy of gas molecules, causing them to collide more frequently and forcefully against container walls, increasing pressure.

9. 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.

10. 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.

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