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