# Chapter 4,5,6 vocab

## 21 terms · The vocab for Newton's first three laws for the test next week.

### Newton's First Law

All objects continue in a state of rest or of motion in a straight line at a constant speed, unless it changes due to forces exerted upon it.

### law of inertia

newtons first law

### kilograms

mass is measured in...

### mass

the quantity of matter in an object

### weight

the force due to gravity on an object

### newtons

forces are measured in ...

### net force

the combination of all forces acting on an object

### normal force

a force that counteracts the weight

### equilibrium

occurs when the net force is zero

a push or a pull

### friction

the force that acts between materials that touch as they move past each other

### inertia

the property of a body t resist change

### inversely

two values change in opposite directions

a=f/m

### air resistance

the friction acting on something moving through air

### free body diagram

a diagram showing all the forces acting on an object

### terminal speed

when acceleration terminates; air resistance = weight

### interaction

a force is part of an ...

### Newton's third law

when one object exerts a force on a second object, the second object exert an equal and opposite force on the first object

### action force

1st force in an interaction

### reaction force

2nd force in an interaction