Question 1:
Figure 1.6 shows Encik Fendi taking a measurement of Wei Li.
(a) State the measured physical quantity.
(b) What is the measured base unit, symbol of the unit, magnitude of the physical quantity and symbol of the physical quantity in the situation shown in Figure 1.6?
Answer:
(a) The measured physical quantity is length.
(b)
Base unit: metre
Symbol of the unit: m
Magnitude of the physical quantity: 1.65
Symbol of the physical quantity : l
Figure 1.6 shows Encik Fendi taking a measurement of Wei Li.
(a) State the measured physical quantity.(b) What is the measured base unit, symbol of the unit, magnitude of the physical quantity and symbol of the physical quantity in the situation shown in Figure 1.6?
Answer:
(a) The measured physical quantity is length.
(b)
Base unit: metreSymbol of the unit: m
Magnitude of the physical quantity: 1.65
Symbol of the physical quantity : l
Question 2:
(a) What is the difference between scalar quantity and vector quantity?
(b) Read the following passage.
Identify the scalar quantities and vector quantities involved in the situation described above.
Answer:
(a) Scalar quantities are physical quantities that have magnitude only.
Vector quantities are physical quantities that have both magnitude and direction.
(b)
Scalar quantities: Distance = 333 km, speed = 80 km/h, time = 3 hours
Vector quantities: Acceleration = 1.2 ms-2
(a) What is the difference between scalar quantity and vector quantity?
(b) Read the following passage.
Identify the scalar quantities and vector quantities involved in the situation described above.
Answer:
(a) Scalar quantities are physical quantities that have magnitude only.
Vector quantities are physical quantities that have both magnitude and direction.
(b)
Scalar quantities: Distance = 333 km, speed = 80 km/h, time = 3 hours
Vector quantities: Acceleration = 1.2 ms-2
Question 3:
Rina and her friends took part in a Treasure Hunt held in conjunction with Science Day in their school. Each group had to fi nd several objects hidden in the school compound within 30 minutes as listed in Figure 1.7.
Identify the base quantities and derived quantities in the above situation.
Answer:
Base quantity is a physical quantity which cannot be derived from another physical quantity.
Derived quantities are physical quantities derived by combining base quantities. This can be done by multiplication or division or both. The unit for a derived quantity is known as derived unit.
Rina and her friends took part in a Treasure Hunt held in conjunction with Science Day in their school. Each group had to fi nd several objects hidden in the school compound within 30 minutes as listed in Figure 1.7.
Identify the base quantities and derived quantities in the above situation.
Answer:
Base quantity is a physical quantity which cannot be derived from another physical quantity.
Derived quantities are physical quantities derived by combining base quantities. This can be done by multiplication or division or both. The unit for a derived quantity is known as derived unit.
Thus,
Base quantities: mass = 950 g, length = 1.5 m
Derived quantities: volume = 500 ml, area = 7.2 m2