Rewrite the sentence using commas.

Pushing up against the skateboard the ground also acts as a force.

I wrote...

Pushing up against the skateboard, the ground also acts as a force.

Yes.

ooops...duplicate...thank you

To rewrite the sentence with commas, you accurately wrote: "Pushing up against the skateboard, the ground also acts as a force." Well done! The comma helps to separate the two clauses in the sentence, making it clearer and more grammatically correct.