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52 Cards in this Set

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What is motion?
An object is considered in motion when it’s distance from another object changes.
An object is considered in motion when. . .
What is the difference between speed and velocity?
Velocity is speed with a given direction
What is the formula for calculating speed/velocity?
The formula is Change in distance divided by the change in time.
? in. .
What is acceleration?
That rate at which velocity changes
the rate at. .
How can an object accelerate without changing speed?
By changing direction
What are the 3 ways an object can accelerate?
-increased velocity
-decreased velocity
-change in direction
7. What does the slope of a distance v time graph indicate about an objects motion?
-speed
How do you determine if an object is going faster or slower than another object?
seeing how steep the slope is
What does the slope of a velocity v time graph indicate about an object’s motion?
accleration
What does it mean if the slope is upward?
getting faster
What does it mean if the slope is downward?
Getting slower
What does it mean if the slope is flat?
Constant Velocity
How could you tell if an object came to a complete stop?
the downward slope went to 0
slope. .
What would the value of an object’s acceleration be if it remained at a constant speed?
0
How fast will an object be going if it accelerates at a rate of 5m/s/s for 8 seconds?
40m/s/s
One object travels 50-m in 3.5 seconds and a second object travels 75-m in 4.5 seconds. Which object has the highest velocity?
The second object has the highest velocity.
If an object increases its speed from 15-m/s to 70-m/s in 4.5-s, what is the acceleration?
12.2m/s/s
If an object is traveling at 400-km/h and slows to 200-km/h, what is its acceleration if this happened in 6-s?
-33.3km/h/s
Explain how Aristotle would explain a pool ball slowly rolling to a stop.
Aristotle- Rest is an objects natural state, every object trys to be at rest, no force is required to get it to rest, WRONG
REST
What is Newtons's 3rd Law?
-For Every Action there is an equal but opposite reaction
action
Explain how Galileo would explain a pool ball slowly rolling to a stop.
Gallileo-The ball would keep on going unless an opposing force stops it. (FRICTION)
force
What is Newton's 2nd Law?
Force=Mass x Accleration
formula
What is Newton's 1st law?
An object in motion will stay in motion, and an object at rest will stay at rest, unless acted on by an unbalanced force
-Inertia
motion and rest. . .
What is inertia?
The tendency of an object to resist a change in motion
the tendency of an object. . .
What physical property of an object affects its inertia?
Mass is the physical property to affect inertia
How does mass affect the inertia?
More mass=more inertia= harder to move
Less mass=less inertia=easier to move
What is a force?
Force- any push or pull that can cause an object to accelerate
What are the units used to measure force?
Force is measured in newtons
What is a balanced force?
Balanced Forces- Forces acting on an object in opposite directions will not cause a change in motion
What is the net force of a balanced force?
Net force=0
Under what two conditions can an object be experiencing a balanced force?
-When an object is at rest
-When an object is traveling at a constant speed.
What is an unbalanced force?
Unbalanced Force- An unequal force that changes an objects motion
What is the net force of an unbalanced object?
net force DOESN'T = 0
An unbalanced force causes an object to do what?
An unbalanced force causes an object to accelerate.
Why is it harder to get an object in motion than it is to keep it in motion?
To get it moving, it is an unbalanced force, to keep it moving, it is a balanced force.
What is the relationship between Mass and Acceleration?
Mass and acceleration are inversely proportional, so when one goes up the other goes down
What are the two kinds of balanced
-Static/Mechanical Equilibrium- objects at rest
-Dynamic Equilibrium- objects moving at a constant velocity
How come action and reaction forces dont cancel eachother out?
Action reaction forces are applied to different objects.
objects
What is friction?
The resistive force that opposes motion or attempted motion of an object past another.
resistive force
What does friction cause?
heat
What two factors affect the frictional force between two objects?
surface material, pressure
What are the 3 types of friction, put them in order from highest frictional force, to lowest.
Sliding Friction
Fluid Friction
Rolling Friction
What is gravity?
A force that pulls objects towards the earth
What is the rate of acceleration due to gravity?
10m/s squared
If gravity pulls all objects at the same rate, what causes objects to fall at different rates?
Air resistence
What is terminal velocity
The maximum velocity that a falling object can reach
What causes Terminal Velocity?
When force of air resistence=force of gravity
What type of force is Terminal Velocity?
It is a Balanced Force
What is the difference between mass and weight?
---Mass: The amount of matter in an object (what you are made up of)
---Weight: The gravitational force exerted on and object’s mass.
-------YOUR WEIGHT CAN CHANGE, YOUR MASS CANNOT------
Why do three objects that are shot horizontally at different rates all hit the ground at the same time?
gravity still pulls it down the same way, because it has some inertia
What two factors affect the amount of gravitational force between two objects? How?
Mass and Distance
----More mass ’ less gravitation pull
-Closer together ’ more gravitation pull
-----Less Mass=more gravitational pull
-Farther apart=more gravitational pull
What is this law and who stated it?
Universal Law of Gravitation
-newton stated this law