Summary
Samenvatting nova Physics vwo 3 chapter 4
- Course
- Level
Summary physics nova vwo 3. expanded with photos
[Show more]
Seller
Follow
stefdjong
Content preview
Summary Physics ch44.1 Accelerating and decelerating
Acceleration, uniform acceleration, uniform motion, deceleration, uniform deceleration.
(v,t) diagram= a speed time diagram. X axis is time and Y axis velocity. (used by calculating distance)
(x,t) diagram= a position time diagram. X axis is time and Y axis position.
In a (v,t)-diagram, the surface area underneath a curve determines the distance traveled.
Vavg= distance in meters(s) ÷ time in seconds(t). If in km/h, answer times 3.6
When the graph isn’t easy to read because it is curved you estimate the distance by counting squares.
v final−v initial
a= , answer in m/s2
t final−t initial Fr
∆v W
a= , ∆ v=a ∙ ∆ t , ∆ t=∆ v ÷ a
∆t es
4.2 Force, mass and acceleration
a m
The total sum of forces on an object is
equal to mass x acceleration
Fres = m ∙ a, a = Fres : m, m = Fres : a
∆
The larger an objects mass is, the more force you must v
exert to change its velocity.
∆
Fg = m ∙ g s
t
4.3 Forces and work
Producing a force requires energy. We call this energy ‘work’
W=F∙s
For energy we simply use the joule (J).
Power is defined the energy consumed in a certain time, thus for mechanical power. And we use as unit W.
W
Pused=
t
1 horsepower corresponds to 735.75 W.
Energy can never be created nor destroyed. It can only be converted from one form to the other.
To graphically show these conversions, we employ so called ‘energy-flow diagrams’.
The degree to which a device uses energy in a useful manner is known as the efficiency of the device.
E used
η= ∙100 % Heat energy (70%)
E total Chemical energy
W = Eused`, it is the same. (100%)
Etotal is mostly the liters of Mechanical energy (30%)
gas you use times the amount of joules 1 liter consists of.
4.4 Braking and collisions
Stopping distance= reaction distance(reaction time) + braking distance
The faster someone is driving, the greater the reaction distance is.
Ways to reduce the deceleration; Reduce the collision speed (decrease ∆v), Enlarge the collision time
(increase ∆t)
Enlarging collision time; Crumple zone (compresses front and back of car instead of compressing you), Seat-
belt (increases stopping distance, thus increasing ∆t)
a
G-force ¿
g
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller stefdjong. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $3.79. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
64438 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now