Question

question #1
if two identical trucks have the same velocity, but one truck is carrying a ton of bricks, the momentum of the truck with the bricks will be

the same.
smaller.
equal to zero.
larger.

question #2
a piece of styrofoam floats on water because the water exerts

the styrofoam exerts no force on the water.
the water exerts no force on the styrofoam.
an upward force equal to the weight of the water displaced by the styrofoam.
a downward force equal to that of the water displaced by the styrofoam.

Explanation:

• For Question #1: The momentum formula is $p = mv$ (momentum equals mass times velocity). Since the trucks have the same velocity and the truck with bricks has greater mass, its momentum will be larger.
• For Question #2: According to Archimedes' principle, an object floating in a fluid experiences an upward - buoyant force equal to the weight of the fluid displaced by the object. So the water exerts an upward force equal to the weight of the water displaced by the Styrofoam.

Answer:

Question #1: D. larger
Question #2: C. An upward force equal to the weight of the water displaced by the Styrofoam