The moon has a gravitational acceleration of 1.6 m/s2. A 1,100-kilogram space rover travels on its surface at 3.2 meters per second. What is the approximate magnitude of the normal force acting on the vehicle?

If the rover is moving at a constant speed, then there is no net force acting on it and the rover is in equilibrium. In particular, Newton's second law says that

n + (-w) = 0   →   n = w

where n and w denote the magnitude of the normal force acting on the rover and its weight, respectively.

With a gravitational acceleration of 1.6 m/s², the rover's weight, and hence the magnitude of the normal force, is

w = n = (1100 kg) (1.6 m/s²) = 1760 N

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