Newton's Laws and Forces

Front

Newton’s second law states that the net force acting on an object is equal to the product of its mass and acceleration (F=ma).

Back

True

Front

A free body diagram shows all the forces acting on an object, including both contact and non-contact forces.

Back

True

Front

Free Body Diagrams (FBDs) include forces that the object exerts on its surroundings.

Back

False (Only forces acting on the object are shown).

Front

Contact forces include only friction and normal forces.

Back

False (Contact forces also include tension, applied forces, air resistance, and spring forces, among others).

Front

The gravitational force between two objects is an example of a contact force.

Back

False

Front

In an action-reaction force pair, both forces act on the same object.

Back

False (Newton’s third law states that these forces act on different objects; they do not cancel each other out on a single object).

Front

Friction always opposes the direction of motion.

Back

False (friction opposes relative motion between surfaces).

Front

If the net force on an object is held constant, increasing its mass will result in a greater acceleration.

Back

False (according to F = ma, for a constant net force, a larger mass results in a smaller acceleration).

Front

The normal force is the perpendicular contact force exerted by a surface on an object in contact with it.

Back

True

Front

The magnitude of the frictional force is proportional to the normal force acting on an object.

Back

True (f = μ_kN or f ≤ μ_sN)