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Science Chapter 11 (holland)
Terms in this set (41)
an object's change in position relative to a reference point.
used to describe the motion of an object relative to these reference points
What makes a good reference point?
an object that doesn't move. something that is stationary.
we can describe ________ by direction, distance, and displacement.
_______ measures the path taken.
__________ measures how far it is between the stating and ending points
What is the difference between distance and displacement? Which is usually shorter.
Displacement how far Is it from my starting point to my ending point
Distance measures the actually length path taken
Displacement is usually shorter
what is speed?
The distance traveled divided by the time during which the motion occurred
How do we calculate speed?
speed= distance/ time
_______ describes speed and direction.
How do we calculate velocity?
velocity= distance/ time
________ is described as positive or negative along the line of motion.
If a body is moving in one direction, it has ______ velocity.
If it is moving in the opposite direction, it has __________ velocity.
What is the SI unit for speed and velocity?
meter per second (m/s)
When an object covers equal distance in equals amount of time, it is moving at a __________ speed.
Average speed is total distance divided by total time. Where as, instantaneous speed = the speed at a given time or ________.
the slope of a distance vs. time graph = _________
acceleration is a change in ________.
acceleration can be a change in _______, ________, or both.
If you move at a constant speed in a circle, _______ is never changing but _________ is constantly changing.
Acceleration that occurs in circular motion is known as ________ acceleration.
any action that can change the state of motion of an object.
What are the 4 fundamental forces in nature
- Force of gravity
- Electromagnetic force
- Strong nuclear force
- Weak nuclear force
Forces vary in _______ and the distance over which they act
__________________ hold together protons and neutrons in the nuclei of atoms and is the strongest of all forces.
strong nuclear force
Gravitational and electromagnetic act over _____ distances.
Gravitational is _______ than electromagnetic
pushes and pulls are _______ forces
_______ forces do not require that the objects touch
EX: Gravity or the repulsion between 2 north poles on a magnet
both types can cause an object to _____ or ______ moving
What is a net force?
Combination of all of the forces acting on the object.
When are forces balanced?
When forces applied produce a net force of zero they are balanced
When are forces unbalanced?
when net force is greater than 0
What is friction?
Unbalanced force that acts against an object's motion
What are the 2 main types of friction?
static & kinetic
_______ is between surfaces that are stationary.
_______ is between moving surfaces
What are the 2 different kinds of kinetic friction?
sliding & rolling
What would you do to increase friction between two objects?
make the surface rougher
What would you do to decrease friction between two objects?
use lubricants such as motor oil, wax, and grease
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