Forces and Motion

A box has two forces acting on it. One force is 10 N downward. Another force is 5N upward. What is the net force on the box?

• 10 N upward

• 10 N downward

• 15 N upward

• 5 N downward

Every action has an equal and opposite reaction.

• Newton's 3rd Law of Motion

• Newton's 2nd Law of Motion

• Newton's 1st Law of Motion

An object at rest will stay at rest and an object in motion will stay in motion unless acted upon by an unbalanced force.

• Newton's 3rd Law of Motion

• Newton's 2nd Law of Motion

• Newton's 1st Law of Motion

The acceleration of an object depends on the net force acting on the object and the mass of the object.

• Newton's 2nd Law of Motion

• Newton's 3rd Law of Motion

• Newton's 1st Law of Motion

A push or a pull exerted on an object that may change the motion or shape of the object; force has strength and direction.

• inertia

• motion

• force

• velocity

the SI unit for force (symbol N)

• force

• speed

• reference point

• newton

the speed of an object in a particular direction

• acceleration

• velocity

• speed

• gravity

the rate at which velocity changes over time; an object accelerates if its speed, direction, or both change

• velocity

• motion

• acceleration

• speed

a force of attraction between objects that is due to their masses and that decreases as the distance between the objects increases

• force

• inertia

• gravity

• reference point

a force that opposes motion between two surfaces that are in contact

• friction

• inertia

• net force

• convection