Types of Forces

What is the fundamental definition of a force in physics?

• A push or a pull

• An interaction between two objects

• The cause of motion

• A measurable quantity that changes an object's state

What is a requirement for a force to be considered present?

• The objects must be in motion

• The mass of the objects must be known

• The two interacting objects must be known

• The force must result in acceleration

What is the consistent direction of the gravitational force on an object near a planet?

• Always straight downward

• Away from the planet's surface

• Towards the center of the planet

• Dependent on the object's movement

How is the normal force always oriented with respect to the surfaces in contact?

• Same way the touching surfaces

• Perpendicular to the touching surfaces

• In the same direction as the applied force

What are the two types of frictions mentioned?

• Air resistance

• Static and Sliding

• Fluid

• Gravity

A book is resting on an slope and is not sliding. In which direction does the friction force act on the book?

• Same as the motion (Book sliding down)

• Opposite of the motion (Opposite of book sliding)

• Same as the motion (Book sliding upwards)

When is a tension force present?

• When an object is moving quickly through air.

• When two surfaces are in contact and pushing against each other.

• When a spring is stretched or compressed.

• When a rope, string, or wire is pulled taut.

What determines the direction of a spring force?

• The direction of gravity.

• The direction the spring moves to restore itself.

• Same as the air resistance

• It is always same to the spring's length.

What is drag?

• Gravity

• Fluid Friction

• Air resistance

• Sliding Friction

In which direction does drag force act on a moving object?

• Always point to the sky

• Same to the object's motion.

• Opposite to the object's motion.

• Towards the center of the Earth.