EFFORT
BASICS
BASICS
A push or pull on an object is called _____.
Force
The rate of doing work.
POWER
Formula for power.
P = W/t
Friction acting on a sliding box does what type of work?
NEGATIVE WORK
Occurs when force causes displacement.
Work
The unit of power.
J/s or WATT
Formula for force due to gravity.
F = mg
The angle between force and displacement when work is zero.
90 degrees
The unit of work.
Nm or J
1 Watt is equal to 1 ______ per second.
JOULE
Formula for work.
W = Fd cos theta
The angle between force and displacement when work is negative.
180 degrees
If you push a wall and it does not move, what type of work occurs?
NO WORK
The unit of power was named after the Scottish inventor named_____
JAMES WATT
If W = 2000 J and t = 10 s, what is the power?
200 W
In terms of WORK in physics, holding a dumbbell steadily involves force but no _____. Therefore, there is no work being done.
DISPLACEMENT
Type of work done when force and motion are in the same direction.
POSITIVE WORK
If two people do the same work, how can one of them achieve high power?
DO OR FINISH THE WORK FASTER OR QUICKER
Find the work: 40 N force moves an object 8 m.
320 J
Power depends directly on _____ and inversely on _____.
WORK AND TIME