Physics Flashcards
Define a scalar measurement
Has only magnitude no direction.
Define a vector measurement
Has both magnitude and direction
Give examples of scalar measurements
Mass (kg) time (s) distance (m) speed (m/s)
Give examples of vector measurements
Force/weight (n) displacement (m) velocity (m/s)
To calculate all three measures need in a vector what maths should be used
Trigonometry
Vectors can be added in 2d space. How is this achieved?
Calculating the two opposing vector triangles and then adding/subtracting the opposing directions.
What does calculating multiple vectors achieve in 2d space?
It gives the overall magnitude and direction of the vector
What is Newton’s first law
Law of inertia - objects will remain in motion until acted upon
What is Newton’s second law?
A net force is equal to mass x acceleration
What is Newton’s third law?
Law of opposites - for every action there is an equal and opposite reaction
What is the formula to calculate gravitational force
g = G • M
———-
2
r
What relationship is gravity to distance
Inversely proportional
g = 1
—
2
r
What units is gravitational force expressed as?
Either force/mass or mass x acceleration
What is a driving force
An applied pushing force
What is a frictional force?
A resisting force created by surface contact
