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Physical Science Chapter 11 Section 2
Terms in this set (39)
What two things does velocity have?
Speed and direction
What two things does acceleration have?
a value and directioin
What happens to velocity when an object undergoes acceleration?
What is the term that describes at at which velocity changes over time?
When does an object accelerate?
if its speed, direction, or both change
Can you accelerate while never speeding up or slowing down?
Yes, because acceleration takes into account changes of and/or direction
How do you calculate acceleration of an object moving in a straight line,
you need to measure the object's velocity at different times.
How can the average acceleration over a given time interval can calculated by
dividing the change in the object's velocity by the time over which the change occurs.
What is the formula for average acceleration?
Acceleration = final velocity- initial velocity/time,or a=Δv/t
Based on the acceleration formula if acceleration is small....
the velocity is changing very gradually
Based on the acceleration formula if acceleration is large
the velocity is increasing more rapidly.
For straight line motion, a positive acceleration always means
that an object's velocity is increasing.
For straight line motion, negative acceleration
that the object's velocity is decreasing(the object is slowing down).
What type of graph can be used to discern acceleration?
speed vs. time graph
On a speed vs. time graph, speed is plotted on the
Y axis (vertical)
On a speed vs time graph, time is plotted on the
X axis (horizontal)
What is an action exerted on a body in order to change the body's state of rest or motion?
What two things does a force have?
magnitude and direction..
What are the four fundamental forces in nature?
gravity, electromagnetic force, strong nuclear force, weak nuclear force
How do the four fundamental force differ?
These forces vary in strength and distance over which they act
Which force holds together the particles in the nucleus of the atom and is the strongest force.
Which force acts over long distances and is 1/100 of the strong nuclear force
Which force acts over long distances but is far weaker than electromagnetic force?
How do forces act?
Through contact or distance
What are examples of contact forces?
pushes and pulls
What forces do not require that objects touch each other
What are examples of field forces
magnitude and gravity
What can field forces do to an object?
cause it to move or stop
What happens to an object when a net force is acting on it?
the object accelerates in the direction of the net force.
What term is used to describe when the forces applied to an object produce a net force of zero
Describe balanced forces?
do not cause an object at rest to start moving nor do they cause a change in motion of a
What happens when If forces act in different directions that are not opposite to each other
the combination of forces act like a single force and causes
acceleration in a direction that combines the direction of the applied forces.
What is a force that opposes motion between two forces that are in contact.
What are the two main types of friction
kinetic and static
What type of friction is the force that resists the initiation of sliding motion between two surfaces that are in contact and are at rest.
What type of friction is the force that opposes the movement of two surfaces that are in contact and are moving over each other.
What art the two type of kinetic friction?
1. sliding friction - when two objects slide past each other
2. rolling friction - when a rounded object rolls over a flat surface
How often is friction needed?
for everyday task
What are some examples of friction?
1. brakes, tires, pencil/paper, shoe soles
2. Unwanted friction can be lowered (ex: nonstick pans, motor oil, wax).
3. Helpful friction can be increased (ex: sand on roads, batting gloves).
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