Work, Force, Power Flashcards
What is force measured in?
Force is measured in Newtons.
Define force.
Force is anything which can change the velocity of an object or make it move.
For every force __ _____ ___ ________ __ _______.
An equal but opposite force is exerted.
What is friction?
Friction is a force which prevents easy movement between two objects in contact.
What does Hooke’s law state?
The extension of a spring depends on the force pulling on it.
Name some uses of friction.
Movement
Fire
Prevents slipping
Ways to prevent friction are…?
Oil
Butter
Ball bearings
Define weight.
The weight of an object is the force of gravity acting on the mass of an object.
What is weight measured in?
Weight is measured in Newtons.
Weight=
Gravity due to the earth 10 (N) x mass in kg.
Define work.
Work is done when force moves an object.
What is work measured in?
Work is measured in Joules.
Work (J) = force (N) x distance (M)
What is power?
Power is the rate at which work is done.
What is power measured in?
Watts
What is the average power?
The average power (watts) is the work done (joules) divided by the time taken (seconds). Power = work done
————
time taken
