Motion Force and Energy Definitions Flashcards
1
Q
speed
A
distance travelled per unit time
2
Q
velocity
A
speed in a given direction
3
Q
acceleration
A
change in velocity per unit time
4
Q
gravitational field strength
A
force per
unit mass
5
Q
density
A
mass per unit volume
6
Q
spring constant
A
force per unit
extension
7
Q
limit of proportionality
A
the extension of an object is proportional to the load producing it up to this limit
8
Q
moment of a force
A
moment = force × perpendicular distance from the pivot
9
Q
momentum
A
mass × velocity
10
Q
impulse
A
force × time
11
Q
resultant force
A
the change in momentum per unit time
12
Q
efficiency
A
(%) efficiency = (useful energy output)/(total energy input) (× 100%)
(%) efficiency = (useful power output)/(total power input) (× 100%)
13
Q
work
A
work done per unit time
energy transferred per unit time
14
Q
pressure
A
force per unit area
