4 - Forces In Action Flashcards
1
Q
Force =
A
Mass * Acceleration
2
Q
Upthrust
A
Equal to the weight of the water displaced
3
Q
Friction
A
Resistive force that act against the movement of the object
4
Q
What is a free-body diagram?
A
Graphical
5
Q
Terminal Velocity
A
Maximum velocity attainable by an object as it falls through a fluid
6
Q
Practical to demonstrate terminal velocity in a fluid
A
Oil and ball
7
Q
Principle of moments
A
The sum of the clockwise moments about any point are the same as the sum of the anticlockwise moments
8
Q
Practical to determine centre of gravity
A
- Put an object on a rod so its freely hanging under the influence of gravity
- Draw a line perpendicular to ground
- Repeat 3 times and where all the lines cross is the centre of gravity
9
Q
Density
A
Mass per unit volume of a substance
