Solve the problem!
A woman presses against a wall with a force of 10 N for 10 minutes. How much work does she does?
What is 0
The librarian lifting a pile of books from the ground to the top of the table. Does it satisfies conditions for work to be done?
yes
Formula for Potential gravity
PE=mgh
It is the rate of doing work.
Power
To raise a 200 kg steel beam to a height of 10 m on a bridge being built requires work of
What is 19.6 kJ
Milo running across the playground. Is Milo doing work?
yes
Formula for power?
P= W/T or Force * Displacement/Time
force that resists the sliding or rolling of one solid object over another
Friction
What is the KE of a 900-kg car whose velocity is
125 kJ
A mother dancing with her baby in her arms.
Is there work done?
no
Formula for Kenetic energy
K.E. = 1/2 m v2.
the acceleration of an object is directly related to the net force and inversely related to its mass.
Newton's second law - the law of acceleration
Six kilo Joule of work are used to lift an object to a height of 100 m. The object mass is approximately
What is 6kg
The vendor pushing her cart across the street. Is there work done?
yes
Centriputal Force
Fc= mac = mv2/r
An object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force.
First Law of Motion (Inertia)
The work a 300-watt electric grinder can do in 5 minutes is
90 kJ
A weightlifter holding a barbell above his head. Is there work done?
No
Formula for acceleration?
ability to do work, which is the ability to exert a force causing displacement of an object
Energy