Flashcards: Motion and Human Mechanics — 29 cards

What is force in physics?

A push or pull that can make an object move, stop, or change direction.

What does motion refer to?

The movement of an object from one place to another.

What does friction do to motion?

It opposes or resists the motion of two surfaces in contact.

What two concepts are involved in walking and running?

Motion and friction between the feet and the ground.

What is translational motion?

Motion where all points on a body move in the same linear direction with the same velocity.

In translational motion, how do all points on the body move at a given instant?

They travel the same displacement, in the same direction, with the same velocity and acceleration.

What does linear motion normally describe?

Motion along a straight path.

To what paths does translational motion apply?

Both straight and curved paths.

What is linear displacement?

The change in position of an object.

What does linear velocity measure?

The rate at which an object changes its position.

Which linear quantity describes translational motion?

Linear acceleration.

What is one characteristic of the described linear motion?

A change in position.

What is another characteristic of the described linear motion?

Linear displacement.

What is a further characteristic of the described linear motion?

Linear direction.

What is angular displacement in circular motion?

The angle made by a body moving in a circular path.

What does angular velocity describe in circular motion?

How fast an object rotates on a circular path with respect to time.

What is angular acceleration?

The rate at which angular velocity changes with time.

What distinguishes translation from rotation in motion?

Translation involves equal linear displacement and common direction, unlike rotation.

What does green represent in the human traffic-light activity?

Constant-velocity movement.

What does yellow represent in the human traffic-light activity?

Speeding up and then slowing to a crawl.

What does red represent in the human traffic-light activity?

Freezing because of inertia.

Which quantities are included in linear quantities?

Distance, displacement, velocity, and acceleration.

Which quantities are included in angular quantities?

Angular displacement, angular velocity, and angular acceleration.

What role do bones of arms and legs play in movement?

They act as levers.

What function do joints serve in arm and leg movement?

They act as pivot points.

How do muscles contribute to walking or running?

Muscles pull on bones to generate force and produce movement.

What is biomechanics founded on in human movement?

Angular motion that enables or controls linear motion.

What does ergonomic motion focus on?

Optimizing mechanical instruments to match natural human movements.

How can an ergonomic keyboard layout improve typing?

By reducing unnecessary hand rotation for smoother typing and greater economy.