Answer: 1.) Direction
2.) Easier
3.) Seconds
Explanation:
1.) Work is defined as the scalar product of force and distance. The force is applied in the same direction as that of distance.
Mathematically,
[tex]W=F.s=Fs(cos\theta)[/tex]
2.) From the above expression, the angle plays an important role in the calculation of work.
When [tex]\theta =0\°[/tex], then [tex]cos\theta =1[/tex] and work done will be maximum in that case.
But, when the angle increases, the magnitude of work decreases and it becomes easier to push.
When [tex]\theta =90\°[/tex], then [tex]cos\theta =0[/tex] and work done will be 0 which is minimum.
3.) Expression for power is given as:
[tex]Power=\frac{Work}{Time}[/tex]
[tex]\text{Unit of power = Watt = }\frac{Joules}{Seconds}[/tex]
Units of time which must be used in calculating power is seconds.
