Date post: | 14-Apr-2016 |
Category: |
Documents |
Upload: | somrita-banerjee |
View: | 220 times |
Download: | 3 times |
Which of these forces do NO work?
A. ConservaBve forces B. Non-‐conservaBve forces C. Forces acBng in the direcBon of a parBcle’s
trajectory D. Forces acBng in the direcBon perpendicular
to the parBcle’s trajectory E. Can’t say in general
Which of these statements is/are true? A. The change in kineBc energy from Bme t1 to
t2 is equal to the total work done on the parBcle in that interval
B. The work done by a conservaBve force depends only on the endpoints of the path.
C. The change in total energy is due only to non-‐conservaBve forces
D. All of the above E. B and C only
The negaBve gradient of the potenBal energy is:
A. Work B. Torque C. A conservaBve force D. A non-‐conservaBve force E. Total energy
Pulley Force and Power Profiles
0 0.2 0.4 0.6 0.8 10
500
1000
1500
Height (m)
Force (N)
Power (W)
0 0.2 0.4 0.6 0.8 10
500
1000
1500
Height (m)
Force (N)
Power (W)
T = mP(g + b(1 – y/h)) T = mPg
Simple Machines
A simple machine is a device that alters a force vector – it changes the magnitude or direcBon of the force applied