Question

question 7 (1 point)
the force that keeps you from sliding on an icy sidewalk is
weight.
kinetic friction.
static friction.
normal force.

Explanation:

• Weight is the force due to gravity, not related to preventing sliding.
• Kinetic friction acts on moving objects; here, we want to prevent sliding (so not moving yet), so kinetic friction is incorrect.
• Static friction opposes the tendency of motion between two surfaces at rest relative to each other. When you are not sliding on the icy sidewalk, static friction prevents the start of sliding.
• Normal force is the force perpendicular to the surface, not directly preventing sliding parallel to the surface.

Answer:

C. static friction.