# science llamas 8th physics quiz

### 18 terms by ellieeyoung

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### speed

rate of change in distance with respect to time

speed equation

### law of intertia

other name for 1st law

### intertia

when an object is at rest it stays at rest and when an object in motion it stays in motion unless acted upon by an unbalanced force

### velocity

change in displacement or direction with respect to time

### acceleration

change in velocity over time

### a=(vf-vi)/t

acceleration equation

### 2nd law of force and acceleration

amount of force needed to make an object change its speed depends on the mass of the object and the acceleration required

### 1st law of motion

object at rest stays at rest and an object in motion at a constant speed stays in motion unless acted upon by an unbalanced force

### air resistance

friction produced by the atmosphere

### 3rd law of action-reaction

for every action there is an equal and opposite reaction

### sliding friction

when two surfaces slide past each other

### rolling friction

makes a tire turn and a ball roll

### static friction

hinders a stationary object from moving on a surface when a force is applied to that object

### need for speed difference in angles

bigger angle went faster

### pick me up difference in angles

speed/acceleration increased with angle

### f=ma

equation for force

### friction

force that exists between any two objects that are touching

Example: