30333676
Description
Flashcards by Malachy Moran-Tun, updated more than 1 year ago
|
|
Created by Malachy Moran-Tun
about 3 years ago
|
|
| Question | Answer |
| What is a System? | A single or group of objects that you're interested in (when measuring energy transfers) |
| Fill in the Blanks: When a _____ moves an object through a distance, ____ is ____ on the object and _____ is transferred | When a FORCE moves an object through a distance, WORK is DONE on the object and ENERGY is transferred |
| What Equation links Word Done, Force, and Distance Moved in the Direction of the Force? | Work Done (J) = Force (N) × Distance Moved in the Direction of the Force (m) or E = Fd |
| What is Power? | > Rate of Energy Transfer > How much Work is Done per Second |
| What Equation links Power, Work Done, and the Time Taken? | Power (W) = Work Done (J) ÷ Time Taken (s) or P = E ÷ t |
| What is a Contact Force? | > A force where objects need to be touching for it to act > E.g. the normal contact force, friction, etc. |
| What is a Non-Contact Force? | > A force where objects aren't touching for it to act > E.g. gravitational fields, magnetic fields, etc. |
| What is the Resultant Force? | The net force that acts on an object, adding or subtracting forces going in the same or different directions, respectively |
| Resolving Forces in revision guide image on reverse of this card | |
| What is a Moment? | > A force can cause an object to rotate > The turning effect is called a moment |
| What Equation Links the Force, Distance Normal to the Direction of the Force, and the Moment of a Force? | Moment of a Force (Nm) = Force (N) × Distance Normal to the Direction of the Force (m) |
| What is the Principle of Moments? | For an object in equilibrium (not turning) Sum of the Clockwise Moments = Sum of the Anticlockwise Moments |
| What are Levers? | > Transfer the turning effect of a force > Making it easier to do work > Increase the distance from the pivot at which a force is applied |
| How do you Calculate the Net Moment from a Lever? | > Calculate the moments of each force using the distance from the pivot > Find the difference between the two > The difference is the net moment, which can be used to determine if an object will rise (see revision guide for examples) |
| What are Gears? | > Circular cogs with teeth > Causing another interlocked gear to turn in the opposite direction > Transmitting the rotational effect of a force > The larger the gear, the slower it spins |
| How do you Calculate how Moments Change between Gears? | > Compare the gear ratios > The force applied to each gear is the same > The ratio of the moments of the two gears is equal to the ratio of teeth (see revision guide for examples) |
Want to create your own Flashcards for free with GoConqr? Learn more.