Friction and Gravitational Interactions

Front

Force Noun

---

[forss]

Back

Force

---

A push or pull exerted on an object, which can cause it to accelerate, change direction, or change shape.

---

Example: A ball on a slope with arrows shows force direction, explaining how force causes movement.

Front

Contact Force Noun

---

[kon-takt forss]

Back

Contact Force

---

A force that is exerted when two objects are physically touching each other, such as friction or a normal force.

---

Example: A child pushing and pulling a box demonstrates contact force through physical touch.

Front

Noncontact Force Noun

---

[non-kon-takt forss]

Back

Noncontact Force

---

A force that one object can apply to another object without touching it, such as gravity or magnetism.

---

Example: Two magnets with similar poles facing each other repel, illustrating a noncontact force.

Front

Friction Noun

---

[frik-shun]

Back

Friction

---

A contact force that two surfaces exert on each other when they rub together, acting in a direction opposite to motion.

---

Example: A box on a surface shows friction with arrows indicating opposing forces.

Front

Static Friction Noun

---

[stat-ik frik-shun]

Back

Static Friction

---

The type of friction that acts on objects that are not moving, preventing them from starting to move.

---

Example: A block on a surface with arrows showing forces, illustrating static friction preventing movement.

Front

Sliding Friction Noun

---

[sly-ding frik-shun]

Back

Sliding Friction

---

The type of friction that occurs when two solid surfaces slide over one another, slowing down moving objects.

---

Example: A box sliding on a surface shows sliding friction, with arrows indicating force and friction.

Front

Rolling Friction Noun

---

[rohl-ing frik-shun]

Back

Rolling Friction

---

The type of friction that occurs when a round object rolls across a surface, which is typically weaker than sliding friction.

---

Example: A ball rolling across a surface, illustrating rolling friction.

Front

Fluid Friction Noun

---

[floo-id frik-shun]

Back

Fluid Friction

---

The type of friction that occurs when a solid object moves through a fluid, such as water or air.

---

Example: An object moving through a fluid experiences fluid friction, shown by arrows indicating motion and friction direction.

Front

Air Resistance Noun

---

[air ri-zis-tuhns]

Back

Air Resistance

---

The specific type of fluid friction that opposes the motion of objects as they move through the air.

---

Example: The image shows how air resistance opposes gravity on a falling parachute.

Front

Gravity Noun

---

[grav-i-tee]

Back

Gravity

---

A noncontact force of attraction that exists between any two objects in the universe that possess mass.

---

Example: Arrows show gravitational force pulling two objects together, illustrating gravity's attraction.