Forces and Motion Flashcards
What is instantaneous speed?
The rate of change of position at a given moment.
How do you calculate instantaneous speed on a graph?
Calculate the gradient
What is average speed?
The distance traveled divided by the time taken.
How do you calculate average speed from a graph?
Read off the total distance travelled, read off the total time taken, use speed = distance / time
What is speed measured in?
m/s (metres per second)
What is distance measured in?
m (metres)
What is time measured in?
t (time)
What is the equation for average speed?
(average) speed = distance / time
What is the gradient of a distance time graph?
The speed
What does a constant speed look like on a distance time graph?
A straight line
What does a stationary object look like on a distance time graph?
A flat line
What does an accelerating object look like on a distance time graph?
A changing gradient
What is an acceleration?
The rate of change of speed
Is speed a vector or scalar?
scalar
Is velocity a vector or scalar?
vector
Is force a vector or scalar?
vector
What is a vector?
A quantity with both magnitude and direction
What is a scalar?
A quantity with just a magnitude, but no direction
List some vectors
Force, velocity, acceleration
List some scalars
Speed, distance, mass
What is weight?
The force of gravity on an object
What is the equation for weight?
W = mg
What does W stand for?
Weight
What does m stand for?
mass
What does g stand for?
Gravitational field strength
What is the value of g on earth?
10 m/ s^2
What is the unit of weight?
Newtons
What is the unit of mass?
Kilograms
What is the unit of g?
metres per second squared. (m/s/s)
What is the equation for pressure?
P = F/A
What is the unit for pressure
Pascals (Pa)
What is the unit for area?
Metres squared (m^2)
What is the difference between displacement and distance?
Displacement has a magnitude and a direction, Distance has a magnitude and no direction
