18 terms

# science llamas 8th physics quiz

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speed
rate of change in distance with respect to time
s=d/t
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