P9- Speed Flashcards
What is the difference between distance and displacement?
Distance is scalar, displacement is vector
What is the difference between speed and velocity
Speed is scalar, velocity is vector
What is the speed of sound?
330m/s
What is acceleration?
The change in velocity of an object or person
What is the typical speed of a person walking (a) running (b) and cycling (c)
A) 1.5m/s
B) 3m/s
C) 6m/s
What is the speed of a typical train (a) and car (b)
A) 50m/s
B)30m/s
How can an object be accelerating if it is moving at a steady speed?
Changing direction
What is the unit for acceleration?
M/s2
What does an object travelling at a negative acceleration mean?
It’s slowing down
What does the line on a distance time graph show
Speed
What does the line on a velocity time graph mean?
The acceleration
How is distance travelled calculated on a velocity time graph?
Calculate the area underneath
What is terminal velocity?
The constant velocity of a falling object in a liquid, when the forces acting upon it are equak
What forces act on an object falling through a fluid?
Drag (from the fluid)
Weight (gravity)
Drag increases as it falls, reducing the resultant force and decreasing the acceleration
What is the name for the frictional force on an object in a fluid (liquid or gas)
Drag
