Forces & Newton's Laws

A set of review flashcards covering the key concepts and definitions related to forces and Newton's laws as discussed in the lecture.

What is inertia?

The opposition of all matter to having its motion changed, also known as 'The Laziness Law.'

What does Newton's First Law state?

An object at rest remains at rest, or if in motion, stays in motion at a constant velocity unless acted upon by an external force.

What is the formula for calculating force according to Newton's Second Law?

F = ma, where F is the net force, m is mass, and a is acceleration.

What is the difference between static and kinetic friction?

Static friction prevents motion until a certain threshold of force is exceeded, while kinetic friction acts opposing the motion of an object already sliding.

What is the unit of force in the SI system?

Newton (N), which is equivalent to kg m/s².

How does mass affect inertia?

Inertia depends on the mass of an object; the more mass, the greater the inertia.

What is the normal force?

The force exerted by a surface perpendicular to the object resting on it.

How do you represent the sum of forces in free-body diagrams?

By showing all forces acting on an object as arrows originating from a point representing the object.

What does Newton's Third Law state?

For every action, there is an equal and opposite reaction.

When does an object experience 'zero weight'?

When there is no local gravity acting upon it.