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science study 1
forces and motion
Question | Answer |
---|---|
speed | how fast an object moves |
velocity | speed and direction |
acceleration | rate at which velocity changes |
deceleration | decrease in velocity |
why do you weigh less on the moon? | weight depends on gravity and there is less gravity on the moon |
what 3 forces can slow you down when your riding a bike? | friction, air resistance, and gravity |
universal law of gravitation | gravity depends on mass and distance |
newtons 1st law(law of inertia) | a body in motion will stay in motion until a net force acts on it and a body at rest will stay at rest until a net force acts on it. |
friction | force between surfaces that poopses motion |
force | push or pull- measured in Newtons(N) |
static friction | force is applied but the objest doesnt move. |
rolling friction | has wheels |
liquid friction | has to do with water |
lubricants | reduces friction |