Help with a physics TEST (im desperate)

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SUMMARY

The discussion centers around a physics test question involving kinematic motion and Newton's laws. The user, a 14-year-old student from Bulgaria, seeks help with a displacement equation, s = 4t - 4t², and is tasked with finding velocity (V) and force (F). The response clarifies that the equation represents constant acceleration motion and emphasizes the distinction between force and power, stating that power (P) is calculated as P = Fv, where F is the net force and v is velocity.

PREREQUISITES
  • Understanding of kinematic equations, specifically s = V_ot + 1/2at²
  • Familiarity with Newton's Second Law of Motion
  • Knowledge of the relationship between force, power, and velocity
  • Basic algebra skills for manipulating equations
NEXT STEPS
  • Study kinematic equations in detail, focusing on constant acceleration scenarios
  • Learn about Newton's laws, particularly the Second Law and its applications
  • Explore the relationship between power, force, and velocity in physics
  • Practice solving problems involving displacement, velocity, and acceleration
USEFUL FOR

Students preparing for physics tests, educators teaching kinematics and dynamics, and anyone seeking to strengthen their understanding of basic physics principles.

Killvenom
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First of all Hi!
Im from Bulgaria (Europe for the ones who don't know where BG is) and I am new to the forum
Im 14 and I've started learning physics in german (i learn in a german high school..)
I might have a bit of mistakes /mainly spelling/ so please excuse me for them...
So tommorow I am having a physics test and a friend made a photo of it
I calculeted most of the exercises but this one i didnt

Its easy perhaps (for you) but not for me:
For the guys who speak german
[Removed German. As per the forum guidelines, all posts must be in English]

For English speakers
A body is moving and weighs 4kg and s = 4t - 4.squaret
The movement type is
V=??
The whole Force (power) is ? N
 
Last edited by a moderator:
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Killvenom

Welcome to PF!

Your formula for displacement, s, is in the form of the basic kinematic motion equation with constant acceleration, that is, [tex]s = V_ot +1/2at^2[/tex]. From this you can get certain information. You need more given information to get all the requested information. The net force can be obtained from Newton's 2nd law.
 
force isn't power. Power = Instantaneous force x velocity

P = Fv
 

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