lesson 7- potential energy Flashcards
(9 cards)
1
Q
what is potential energy
A
energy stores or held in readiness
2
Q
why is it called potential energy?
A
because it has potential to do work
3
Q
mass: scaler or vector quantity?
A
scalar
4
Q
weight: scaler or vector quantity?
A
vector
5
Q
what is the difference between mass and weight
A
mass= amount of matter; weight = measure of force of gravitational attraction (N)
6
Q
formula for weight
A
W = mg
7
Q
acceleration due to gravity
A
- when objects near earth’s surface fall with same acceleration (eg jumping off a building )
8
Q
gravitational potential energy
A
energy stored in an object at any position above earth
9
Q
potential energy calculations
A
ep = mgh
