Newton's Second Law says that force equals mass times acceleration, or $F=ma$. This law shows us some tough problems when it comes to exploring space. Here are a few key difficulties we face:

1. Mass and Thrust: Rockets are very heavy, and they have to fight against Earth's gravity. To make a rocket go up, we need a lot of power, which makes designing rockets quite tricky.

2. Limited Maneuverability: Once a spacecraft is in space, changing its path requires careful calculations. If we get these calculations wrong, it can lead to expensive mistakes and failed missions.

3. Fuel Limitations: Rockets need fuel to move, and how much fuel we need depends on the rocket's weight and how far it needs to go. Managing fuel well is a constant challenge, which can limit what we can do during a mission.

To tackle these problems, scientists and engineers are developing new technology for launching rockets. They are looking into things like ion propulsion and electric engines. These technologies could help us use fuel more efficiently and give us better control.

Ongoing research, tests, and practice will help us get better at using $F=ma$ in our space missions. This way, we can overcome the tough challenges of exploring space.