Question

what makes it more difficult to push a block of wood on a sandpaper surface than on a glass surface?
a gravitational force
b centrifugal force
c frictional force
d kinetic force
click the button or type the letter next to your answer.

Explanation:

To determine the answer, we analyze each option:

• Option A: Gravitational force is the force of attraction between objects due to mass. It acts vertically and doesn't directly affect the difficulty of pushing horizontally on different surfaces.
• Option B: Centrifugal force is a fictitious force in a rotating frame. It's not related to pushing a block on different surfaces.
• Option C: Frictional force opposes motion between two surfaces in contact. Sandpaper is rougher than glass, so it has more friction, making it harder to push the block. This matches the scenario.
• Option D: There's no standard "kinetic force" in this context. Kinetic energy is related to motion, but not a force that explains the difficulty here.

Answer:

C. frictional force