The amount of total force F that is applied to an object is proportional to the rate at which the object changes its speed, or acceleration a . That is, the greater the force, the greater the acceleration for the same object. The constant of proportionality is how heavy the object is, its mass m . The heavier the object, the lower the acceleration for the same force. Write an equation that relates these three quantities in a proportional relationship
1. F=ma
2. a=Fm
3. F=m/a
4. a=m/F