SCIENCE AT WORK
WORK
What is the unit of work?
JOULE OR JOULES
How much work is done after pushing a car with 100 Newton by 2.5 meters?
250 Joules
In physics, what is the ability to perform work?
ENERGY
The amount of energy transferred by a force
WORK
What is the symbol for work in physics?
capital W
An object is horizontally dragged across the surface by a 100 N force acting parallel to the surface. Find out the amount of work done by the force in moving the object through a distance of 8 m.
Work done = 800 J
When you exerted a very large scale of force but still there is no work done. Why?
There is no displacement in an object.
What should be the direction of the force applied on the object and the object's displacement?
PARALLEL OR SAME DIRECTION
What is the equivalent unit/s of 1 Joule?
1 Newton-meter
What is the amount of work that is done over a given time?
POWER
English physicist, mathematician who studied the nature of heat, and discovered its relationship to mechanical work.
James Prescott Joule
Energy can neither be created nor destroyed, and it can only be transformed from one form to another.
It is equal to one joule of work done in one second.
1 Watt
A box of 50 Newton of weight is brought by a boy from position A to position B which is 3 meters and then brought back to position A. What is the work done by this boy?
0 Joule.
In him, the unit of power in the International System of Units (SI) equal to one joule of work performed per second. Who is this scientist?
James Watt
How work is related to power?
Doing work at a faster rate requires more power.
If 1 Joule is 1 N-m, then what is another equivalent unit of work?
1 kg ⋅ m2/s2
A boy of 450 N of weight climbs a wood steps with a lenght of 3 m. The boy takes 6 seconds to get the end of the steps. What is the power done by the boy on this activity!
Power is 225 Watts.
Why 1 horsepower is 746 watts?
One horsepower is the amount of power used by a horse to lift a 550 pounds heavy object from a depth of 1 foot in one second.