12. Mechanics and Materials (PMT)

What physical quantities are described by scalars?

• Magnitude and direction

• Only magnitude

• Only direction

• None of the above

Which of the following is a vector quantity?

• Temperature

• Speed

• Displacement

• Mass

When two vectors are perpendicular, which method is suitable for finding the resultant vector?

• Trigonometry

• Calculation

• Scale drawing

• Estimation

Using Pythagoras' theorem, what is the resultant force if two forces of 5 N and 12 N act perpendicular to each other?

• 13 N

• 11 N

• 17 N

• 10 N

What is the angle of the resultant vector from the horizontal if one vector is 5 N and the other is 12 N?

• 22.6°

• 45°

• 30°

• 60°

What tool is necessary for creating a scale drawing of vectors?

• Calculator

• Protractor

• Compass

• Stopwatch

What is the magnitude of the displacement shown in the diagram, when scaled to real-life measurements?

• 49 m

• 4.9 m

• 490 m

• 4900 m

What is the direction of the displacement shown in the diagram?

• 72° North

• 72° East

• 72° South

• 72° West

For a velocity vector of 10 m/s at an angle of 30° from the horizontal, what is the vertical component of the velocity?

• 8.7 m/s

• 5 m/s

• 10 m/s

• 7.5 m/s

What is the value of the component of weight parallel to the plane for a block resting on a 15° inclined plane with a weight of 50 N?

• 12.9 N

• 48.3 N

• 50 N

• 15 N