Unit 3 - Forces 1 (Measuring, Stretch, Hooke's Law) Flashcards
An effort that causes an object to change movement, direction, or shape because of being pushed
Pushing force
An effort that causes an object to change movement, direction, or shape because of being pulled
Pulling force
A force that causes a turning effect about a pivot
Turning force
The unit of force
Newton (N)
A device that uses the stretching of a spring to measure force
Newtonmeter
How close measured values are for repeated results
Precision
The force of gravity acting on an object
Weight
The force that pulls masses towards one another
Gravity
The amount of matter in an object measured in kilograms (kg)
Mass
When there is no mass nearby to exert a force due to gravity or the apparent feeling of a lack of gravitational force acting due to an object falling in a gravitational field e.g. Feeling weightless when in orbit around a planet.
Weightless
Suggestions with reasons of what may occur (if…then…)
Prediction
The force an object exerts on something else
Action force
An equal sized force acting in the opposite direction to the action force
Reaction force
To squash with a force
Compress
To use a pulling force to make something longer
Stretch
When a material returns to its original shape and size after a deforming force is removed
Elastic behaviour
The maximum force that can be applied to a material for it to return back to its original size and shape without being permanently changed
Elastic limit
Easily cracked or broken by hitting or bending
Brittle
The increase in length of a material when a stretching force is applied
Extension
This Law states a spring will extend regularly as the force on it is increased (the extension is proportional to the load up to the elastic limit) – force = spring constant × extension (F = k × e)
Hooke’s Law
