Yes, gravity does act on the Mars Rovers. On Mars, the gravity on the surface is 39% as strong as it is on Earth. This is also about the same amount on Mercury. A man weighing 200 pounds on Earth (or 440 kg) would weigh 78 pounds on Mars (171.6 kg). The six wheels the rovers have push the rovers around, they just don't have to work as hard to overcome the weak Martian gravity.
its gravity
As with any object, Mars does have gravity. It may not be as strong as on earth, but it is there and it attracts objects to its surface.
there is only one mars rover and NASA invented the mars rover.
a Triangular balloon it bounced till gravity brought it down and deployed the rover
The US built the Mars Rover
The Mars Rover was not discovered it was invented.
The mars rover was invented at Nasa.
the mars rover Spirit found water or ice on Mars
Yes, the Mars Rover has cameras to examine the land on Mars.
NASA made the mars rover probably because they want to learn about Mars.
No they are different rovers.
mars rover