# Lesson 21 Newton's Laws of Motion

### 9 terms by acfrost

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### net force

the sum of all the forces acting on an object

### inertia

the tendency of an object to resist changes in motion or position

### Newton's first law of motion

states that the velocity of an object will remain unchanged unless an unbalanced force acts on it

### mass

the amount of matter that makes up an object

### friction

a force that acts between two surfaces in contact with each other and that tends to oppose motion

### acceleration

the rate of change in an object's velocity

### Newton's second law of motion

states that when a net force acts on an object, the object will accelerate in the direction of the net force

### Newton's third law of motion

states that when one object exerts a force on a second object, the second object exerts a force on the first that is equal in size and opposite in direction

Example: