Inertia and Newton's Third Law
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What is inertia?
The tendency to keep moving with the same velocity
Describe what is meant by ‘inertial mass’.
A measurement of how difficult it is to change the velocity of an object
What does Newton’s third law of motion say?
When two objects interact, the forces they exert on each other are equal and opposite
How can inertial mass be found by using Newton’s second law?
• Inertial mass is the ratio of force over acceleration • So, rearrange to find the mass - (m = F ÷ a)
When is an object in equilibrium?
When the resultant force acting on it equals zero
(Exam-style question)
(Exam-style question) Two students each stand at rest on a skateboard by a wall. They both push against the wall with a force of 24N. (Assume there is no friction between the skateboards and the ground) Explain, in terms of forces, why the students would move away from the wall.
• As the students push the wall, the wall will exert an equal and opposite force on each student • As there is no friction, each student will have a resultant force pushing them away from the wall which causes them to move