Inertia and Inertial Mass | GCSE Physics Practice
Inertia is the tendency of objects to resist any change in their motion.
Is it harder to start moving a heavy box or a light one?
What is Inertia and Inertial Mass | Practice?
"The tendency of objects to continue in their state of rest or uniform motion."
What is the resultant force on an object if a 10N force acts right and a 4N force acts left?
Which of these is the correct vector equivalent of 'Distance'?
An object moves at a constant velocity. What is the resultant force?
What is the unit of the spring constant (k)?
Resistance to Motion
Inertial mass is a measure of how difficult it is to change the velocity of an object.
It is defined as the ratio of Force / Acceleration ($m = F/a$).
Objects with larger mass have larger inertia.
This applies to objects starting from rest or already in motion.
Definition Drill: Inertial mass is NOT the same as weight. One is about resisting motion; the other is about gravity.
Want to improve faster?
The fastest way to improve your grade is to practise exam-style questions, identify your gaps, and focus only on what you don't know.