Question

how does increasing the mass of an object affect the force needed to accelerate it, according to the video?
a. more mass means less force is needed
b. more mass means more force is needed
c. mass has no effect on force required
d. mass and force are unrelated

why does the dodgeball sitting on the table not fall through the table?
a. because gravity is not acting on the ball while on the table
b. because the table exerts an upward force equal to gravity
c. because the ball has no mass
d. because the ball is glued to the table

newtons first law is explained in the video. which statement matches that law?
a. force equals mass times acceleration
b. for every action there is an equal and opposite reaction
c. an object at rest stays at rest unless acted on by an outside force
d. energy is conserved in a closed system

Explanation:

• For the first question, according to Newton's second law \(F = ma\) (where \(F\) is force, \(m\) is mass, and \(a\) is acceleration), if acceleration \(a\) is constant, when \(m\) (mass) increases, \(F\) (force) must increase.
• For the second question, when a dodgeball is on a table, gravity acts downward (\(F_g=mg\)) and the table exerts a normal force \(F_N\) upward. In the vertical direction, since the ball is at rest (\(a = 0\)), from Newton's second law \(F_{net}=F_N - F_g=0\), so \(F_N=F_g\).
• For the third question, Newton's first law states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

Answer:

• First question: B. More mass means more force is needed
• Second question: B. Because the table exerts an upward force equal to gravity
• Third question: C. An object at rest stays at rest unless acted on by an outside force