Using F = ma Flashcards
1
Q
what is the resultant force of an object acted on by two unequal forces acting in opposite direction?
A
F1 - F2 = ma
2
Q
How is tension calculated?
A
F - T = ma
3
Q
How is rocket thrust calculated?
A
mg = ma
4
Q
In a lift, when is the tension in the cable less than weight?
A
moving up and decellerating
moving down and accellerating
5
Q
How is the force of an object moving down a slope calculated?
A
mg sinθ - Fo = ma
Fo = friction
6
Q
How can force of an engine be added to the force of an object moving down a slope?
A
FE + mg sinθ - Fo
Fo is the combined sum of air resistance and breaking force
7
Q
Why does the horziontal forwards force has to change on a vehicle to maintain constant acceleration?
A
- forward force has to increase
- as drag increases with speed
- so resultant force to remain the same
- otherwise it would decrease
