# Chapter 4 Review

## Unit 4 Vocabulary

Circular – having the form of a circle.

Centripetal – moving to tending to move toward a center.

Centrifugal – moving or tending to move away from a center

Free-body diagram – diagrams used to show the relative magnitude and direction of all forces acting upon an object in a given situation.

Friction – the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other

Kinetic – occurs when two objects are moving relative to each other and rub together.

Static – two or more solid objects that are not moving relative to each other.

Linear – straight line. / Moving in a straight line.

Normal force – the component perpendicular to the surface of contact.

Net force – overall force acting on an object.

Tangent – line that just touches a curve at one point.

Torque – a twisting force that tends to cause rotation.

Weight – mass times gravity.

Apparent – clearly visible or understood.

Weightlessness – lacking apparent gravitational pull.

## Free body diagrams and calculating force.

NET FORCE PRACTICE PROBLEMS- Calculating the Net Force, Free Body Diagrams, F = ma

## Relationships between net force, mass, and acceleration.

Newton's Laws Of Motion (2) : Force, Mass And Acceleration

## Newton's second law

Newton's Second Law of Motion - Science of NFL Football