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42 Cards in this Set

  • Front
  • Back
What is an object's change in position relative to a reference point?
What are some ways we describe motion?
direction, distance, and speed
What is an object that stays (or appears to stay) in one place?
reference point
What is how fast something's moving?
How can you calculate the average speed of something?
What is the SI unit for speed?
meters per second
What is the speed of an object in a particular direction?
How do you determine resultant velocity?
same direction-add
different direction-subtract the smaller number from the larger
What is the rate at which velocity changes?
When does acceleration occur?
When there's a change in speed, direction, or both
When is acceleration positive and when is it negative?
positive-increase in velocity
negative-decrease in velocity
How can you calculate average acceleration?
final velocity-starting velocity/time it takes to change velocity
How is it possible to be accelerating and traveling at a constant speed?
if you change direction
What is the acceleration that occurs in a circular motion?
centripetal acceleration
What is the push or pull on an object?
What can forces cause to happen to an object?
changes in motion (stop, slow down, speed up)
What is the unit used to measure force?
Newtons (N)
What is the combonation of all forces acting on an object?
net force
How do you calculate net force?
same direction-add
differenct direction-subtract the smaller from the larger
What is it when objects are in control?
mechanical force
What is it when objects do not need to be in contact?
field force
Describe a balanced force.
-net 0 N
-won't cause a change in motion
Describe an unbalanced force.
-net force isn't 0 N
-a change in motion
Give some examples of balanced and unbalanced forces.
balanced-light hanging on cieling, book on desk, bird's nest in a tree
unbalanced-soccer ball after kicked, teeter-totter in motion
What is the force that opposes motion between surfaces that are in contact?
What is the force that opposes motion between surfaces that are in contact?
The amount of friction depends on what factors?
-roughness of surfaces
-amount of force pushing object together
-mass of objects (surface area)
What kind of an effect can friction have on an object in motion?
-slow down or stop motion
-build up heat
What is the friction between moving surfaces?
kinetic friction
What is the friction between objects that balances any opposing force so object does not move?
static friction
What are some ways friction is helpful?
-help you walk
-write with pen or pencil
-keep car on road
What are some ways friction is harmful?
-wear holes in clothes
-erodes soil
-wears out machine parts
What are some ways you can reduce friction?
-smoothing surfaces
-using lubricants
-change sliding friction to rolling
what are some ways you can increase friction?
-rougher surfaces
-increase forces on surface
What is the force of attraction between objects due to their masses?
What is the measure of the gravitational force of an object?
What is the measure of the amount of matter in an object?
How is mass and weight different?
weight can change from place to place, but mass doesn't
What is it that states all objects in universe attract eachother through gravitational force?
Law of Universal Gravitation
What factors affect the amount of Gravitational force?
1.mass of object
2.distance between objects
Why would your weight change, not your mass if you landed on another planet?
mass never changes; you never get smaller or bigger, but gravity would be different, so your weight would too
What is the measure of gravitational force?