The more __________ an object has the less influence a given force will have on its motion.

The more __________ an object has the less influence a given force will have on its motion.

• A. Mass
• B. Velocity
• C. Density
• D. Size

Answer: (A)

Mass is the factor that determines how strongly an object resists changes in motion. When you push with the same force on two objects, the heavier one resists speeding up or slowing down more because it has more inertia. This means the lighter object will change its motion—speed up or slow down—more than the heavier one. Think of pushing a light toy car and a heavy grocery cart with the same push. The toy car speeds up quickly, while the grocery cart changes its speed only a little. That difference comes from how acceleration reacts to mass: a = F/m. With a bigger mass, the same push creates a smaller acceleration, so the motion changes less. Density and size don’t directly dictate how much a push changes motion, because they don’t alone tell you how much mass there is. Velocity is just how fast something is already moving, not how much a given force will alter that motion. So the factor that makes a given force have less effect on motion is the mass.

Mass is the factor that determines how strongly an object resists changes in motion. When you push with the same force on two objects, the heavier one resists speeding up or slowing down more because it has more inertia. This means the lighter object will change its motion—speed up or slow down—more than the heavier one.

Think of pushing a light toy car and a heavy grocery cart with the same push. The toy car speeds up quickly, while the grocery cart changes its speed only a little. That difference comes from how acceleration reacts to mass: a = F/m. With a bigger mass, the same push creates a smaller acceleration, so the motion changes less.

Density and size don’t directly dictate how much a push changes motion, because they don’t alone tell you how much mass there is. Velocity is just how fast something is already moving, not how much a given force will alter that motion. So the factor that makes a given force have less effect on motion is the mass.