friction Flashcards
what is friction
a force that resists motion
what is a sliding friction
friction force that resists the motion of an object moving across a surface
what is a static friction?
friction force that resists the motion between two surfaces that aren’t moving.
a model for friction:
the greater the force squeezing two surfaces together; the greater the friction force
what is a normal force?
the force that a surface exerts on an object that’s pressing on it. “ equal strength”
what are the types of forces?
- weight
- friction force
- applied force
- air resistance
three types of force vectors:
- compression
- weight
- mass
what is the weight formula?
w= m.g
what is the gravity on earth?
9.8
what does accelerating mean?
the rate at which velocity changes
what is the formula of acceleration?
a= s/t
what does free fall mean?
an object falls with only the force of gravity.
what does free fall mean?
an object falls with only the force of gravity.
what does free fall mean?
an object falls with only the force of gravity.
what does free fall mean?
an object falls with only the force of gravity.
