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UCE (O-Level) — free MCQ practice

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Several force vectors all lie along the same straight line. What name is given to vectors like these?Read the answer and worked solution →Which everyday example is a non-contact force?Read the answer and worked solution →A tray lies still on a flat table. In which direction does the force that the table exerts on the tray act?Read the answer and worked solution →A heavy crate is pushed steadily but does not budge. Which force is opposing the push?Read the answer and worked solution →

Worked practice questions

Several force vectors all lie along the same straight line. What name is given to vectors like these?

  1. Co-linear vectors
  2. Component vectors
  3. Resultant vectors
  4. Independent vectors
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Correct answer: A. Co-linear vectors

1. Vectors that are parallel can be shifted so that they fall on a single line. 2. Vectors falling on the same line are called co-linear vectors. 3. A resultant is the single vector that replaces a whole group, so that word names the answer to the addition, not the group itself. 4. Components are the parts a single vector is broken into, which is the opposite operation. _Source: Siyavula Physical Sciences Grade 11 (Everything Science, CC BY 4.0), Chapter 1: Vectors in two dimensions_

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Which everyday example is a non-contact force?

  1. The pull of gravity
  2. The push of a hand
  3. The pull of a rope
  4. The force of the wind
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Correct answer: A. The pull of gravity

1. A contact force must touch the object before it can change anything about it. 2. A non-contact force does not have to touch an object to cause a change. 3. Gravity acts across empty space, which is why the Earth can pull the Moon. 4. Hands, ropes and wind all have to be in contact with the object before they act. _Source: Siyavula Physical Sciences Grade 11 (Everything Science, CC BY 4.0), Chapter 2: Newton's laws_

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A tray lies still on a flat table. In which direction does the force that the table exerts on the tray act?

  1. Parallel to the surface
  2. Perpendicular to the surface
  3. Along the line of motion
  4. Opposite to the applied push
Show answer and solution

Correct answer: B. Perpendicular to the surface

1. The force a surface exerts on an object resting on it is called the normal force. 2. The normal force is always perpendicular, that is at a right angle, to the surface. 3. Forces that act parallel to a surface are frictional forces, not normal forces. 4. On a flat table the normal force happens to point straight up, but on a tilted table it tilts with the surface. _Source: Siyavula Physical Sciences Grade 11 (Everything Science, CC BY 4.0), Chapter 2: Newton's laws_

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