How does mass affect speed?

Answer 1

== F=m*a Force = mass * speed a = F/m For the same Force F

the speed is big for small mass

the speed is small for big mass == The more mass something has, the more force is required to accelerate it to a given speed. The less mass something has, the less the force required to accelerate it to a given speed. Simple and easy. For a given amount of force, the less the mass it is applied to, the higher the speed that will result. The more the mass to which it is applied, the lower the speed that will result. It's just that simple.

Answer 2

It increases it. A particle of mass in an accelerator will absorb the energy accelerating it (law of conservation of energy) as inertial mass. At close to the speed of light both the energy required to accelerate the particle and its mass, becomes almost infinitely high. You may be more used to thinking of this as 'momentum'. In fact it is difficult to 'see' the mass. It exists in a 'cloud' of free action particles surrounding it, growing (in size, density and frenetic activity) with increased velocity. These are often termed 'photoelectrons'. But when the particle collides with something the force evidences the high inertial mass. A motor bike going fast will have a similar effect to a large car going slowly when they collide with something, as they have similar inertial mass.