Describing Motion Flashcards
True or false? Scalar quantities only have a magnitude.
True
What is a typical person’s running speed?
3 m/s
State which of the following are scalar quantities: distance, velocity, speed, displacement
Distance and speed
Name two vector quantities
E.g. Force, acceleration, momentum, weight
An ant ambled 0.4 m along Anthony’s arm in 100 seconds. Calculate its average speed.
0.004 m/s
average speed = distance / time = 0.4 / 100 = 0.004 m/s
A bird flies 4 km north and then 4 km south. What is the distance travelled? What is the bird’s displacement?
The distance travelled = 4 / 4 = 8 km
The bird finishes as its start point, so its displacement is 0 km
Estimate how far sound travels in air in 3 seconds.
1020 m
Speed of sound in air = 340 m/s
distance = speed x time = 340 x 3 = 1020 m
Niamh did a wheelie on her bike for the 420 m from her house to the library at an average speed of 6 m/s. How long did it take her?
70s
time = distance / speed = 420 / 6 = 70s
