Newton's Second Law
Write an equation that shows the relationship between acceleration and mass under a constant force?
acceleration∝1/mass
Both _____ & _____ are called fluids because ______.
Liquids, Gases, they flow
Why is a sharp knife better at cutting than a dull knife?
The pressure it applies is greater
What is Vinitial for an object in free fall?
0 m/s
DAILY DOUBLE WHAAAAAAAAAAAAAT
Define air resistance.
The friction acting upon something moving through air.
In 90 seconds, list 4 factors that affect terminal velocity and how they affect it.
Mass- more massive objects have higher terminal velocity
Air density- higher air density- reduces terminal velocity
Shape/Drag- streamlined/dynamic objects have higher terminal velocity
Frontal/cross sectional area- larger areas have lower terminal velocity
What causes an object to accelerate?
Unbalanced forces
What is a free body diagram?
A diagram showing all the forces acting on an object.
For a constant force, an increase in the area of contact will result in ________________.
a decrease in pressure.
Define Free Fall
When an object is falling due to acceleration due to gravity, with no air resistance or any other forces action on it.
Fnet= W-Fair
If both the net force acting on an object and its mass double, what happens to the acceleration?
It stays the same
In what direction does friction act?
In the opposite direction of the force being applied.
Define Pressure
Force per unit area
Acceleration of an object in free fall is ___________.
Always constant
Using precise language, explain how we find the value of air resistance of an object that has reached terminal velocity.
By finding the magnitude of whatever force was accelerating it because they are both equal.
DAILY DOUBLE WOOHOOO
Multiplying kilograms and meters per second gives us_____.
Newtons
(15 secs)
Draw a free body diagram of what happens when Someone pushes a desk, sliding it on the floor.
(checked)
One newton per square meter is equal to one_____.
Pascal
What is the equation for weight and why is that the equation?
W=mg
Newtons second Law gives us F=ma
Weight is force due to gravity and g is acceleration due to gravity.
Why is g always the same whenever we use it (on earth)?
The ratio of weight to mass is the same for all objects.
(15 secs)
State Newtons Second Law of Motion and its 3 main points.
State Newtons Second Law states that:
- the acceleration produced by a net force on an object is directly proportional to the magnitude of the net force,
- is in the same direction as the net force,
-and is inversely proportional to the mass of the object.
What does the force of friction depend on?
The kinds of material in contact and how much the surfaces are pressed together.
How could you place a table on the floor with the least amount of pressure possible?
Upside down
If given final velocity of an object that was in free Fall, what equation will I use to find the height it was dropped from?
VFinal =√2gh
The air resistance acting on an object depends on what? (list 3 things)
Speed, Shape, Frontal Area, Air density, and Drag coefficient.