Question

Ali pushes a toy car initially at rest towards javed by exerting a constant horizontal force F of magnitude 10N through a distance of 2 meters. How much work is done onthe toy car? a 5j b) 10j c) 15j d) 20j e) 25j

Answer 1

Answer: d) 20J

Step-by-step explanation:

Work
`W` done by a Force
`F` refers to the release of potential energy from a body that is moved by the application of that force to overcome a resistance along a path.

It should be noted that it is a scalar magnitude, and its unit in the International System of Units is the Joule (like energy). Therefore, 1 Joule is the work done by a force of 1 Newton when moving an object, in the direction of the force, along 1 meter:

`1J=(1N)(1m)=Nm`

Now, when the applied force is constant and the direction of the force and the direction of the movement are parallel, the equation to calculate it is:

`W=(F)(d)` (1)

When they are not parallel, both directions form an angle, let's call it
`\alpha`. In that case the expression to calculate the Work is:

`W=Fdcos{\alpha}` (2)

In this case both (the force and the distance in the path) are parallel, so the work
`W` performed is the product of the force
`F` by the distance traveled
`d`. as shown in equation (1).

Hence:

`W=(10N)(2m)`

`W=20Nm=20J` >>>>This is the work