What will subtracting matter from the object cause an object to do?

Answer 1

If an object loses mass, it will

-- weigh less that it did before, in any given gravitational field

-- have less momentum and less kinetic energy at any given speed

-- have less gravitational potential energy at any given height

-- require less work to lift it to any given height

-- respond to any given force with more acceleration than it responded with before

-- hurt less when dropped on your foot than it did before

-- If its volume doesn't change, then it will have lower density than before.

-- If its volume doesn't change, then it will experience greater buoyant force in liquid.

If it didn't float before, it may float now. If it did float before, it will float higher now.