Testable Question Non-Testable Question

Does the temperature of water Does changing the kind of affect the time it takes a sugar surface affect how far my ball cube to dissolve? will roll?

Does changing the amount of Does the size of wheels affect light affect the growth rate how far my toy car moves?of plants?

Will a rocket go higher? Does laundry detergent make dirty white clothes clean?

Will hairspray move a Will the mass of a spaceship potato? affect how fast if falls?