Rotational dynamics and kinematics mistakes Flashcards
State the direction of centripetal force
Towards the centre of the circle
State effect of decrease or increase in velocity of object moving in circle hanging from string on angle Ø between string and vertical through the centre of the horizontal circle of the objects path,
If v decreases Ø decrease since centripetal force will decrease and weight will stay the same.
Vice versa for increase
Why is moment of inertia greater using conservation of energy way of calculating
Energy is lost
If equation has something squared the % uncertainty will be
Multiplied by 2
Why when speed of sphere moving in circular path attached to string decreases will it stop travelling in circular path
When speed decreases the tension or centripetal force will decrease.
Weight is greater than the centripetal force that would be required for this circular motion
Why can car travel faster in a circle on a banked track?
Component of reaction now acts radially, centripetal force now increases
When asked for giving equation make sure that it is
Fully differentiation not just by d/dt (equation)
When asked to find acceleration from an equation involving s=
Use second order differentiation
In question where plane levels out from a previously banked circular rotation what will happen.
The plane will accelerate upwards as the vertical component of lift will increase and weight stay constant.
When stating what will happen when spinning person holds mass closer to their body remember to mention:
That mass stays constant
When using equations for angular motion:
Write them from relationship sheet very carefully and don’t be a dumb cunt
