- #1

M3D1

- 3

- 0

### Example: How much energy is needed to lift an 0.1 kg apple up 1 meter?

To

**hold**a 0.1 kg apple against gravity needs 1 Newton of force:

**F**= m

**= 0.1 kg ×**

F

*g*F

**9.8 m/s2**

F≈

F

**1 N**

But holding an apple is not work, the apple needs to

**move**!

So, raising it using

**1 N**for

**1 m**(both in same direction!) gives:

Work =

**1 N**×

**1 m**× cos 0° = 1 J

‐--------‐-----‐------------

i am confused in that if 1N only holds the apple (since the force of gravity and my hand add up zero net force to apple) then how does apple moves up 1 meter by just 1N to a 1 meter distance to result in one J of energy. i don't know whether i misunderstood the concept of work or misunderstood sth about question .

thanks in advance for any help i could recieve