Final answer:
The terms 'mass' and 'speed' both represent scalar quantities, while 'velocity', 'acceleration', and 'force' are vector quantities.
Step-by-step explanation:
The terms representing scalar quantities, which means they are described only by magnitude and not direction, are mass and speed. Therefore, the correct answer to the question 'Which terms both represent scalar quantities?' is option 2: mass and speed.
On the other hand, velocity and acceleration are vector quantities because they include both magnitude and direction. Force is also a vector quantity, as it describes the push or pull in a specific direction.
Kinematics is the study of motion without considering its causes, where terms like force, mass, acceleration, and velocity often come into play. It's important to differentiate between vectors and scalars to understand motion and forces correctly.