Ivar said:Wa=1/2*0.2*11^2 + 0.2*9.81*8.5 - 1/2*0.2*0^2 = 12.1+16.67=28,77
No that's not right. The right hand side of that equation is always zero. But surely the final speed is not zero? You seem to mixing up the kinetic energy with the potential energy, I would suggest reviewing these concepts.Ivar said:Well, that would be the 1/2v^2*mgh=1/2V(0)^2*mgh(0), would it not?
It doesn't help you calculate air resistance, it helps you (and me) find your mistake.Ivar said:How does that help me calculate the resistance of the air?
The difference between the kinetic energy in the case of no air resistance and the kinetic energy in the given case is equal to the work done by air. (The ball loses some kinetic energy by doing work on the air; so how much energy did it lose?)Ivar said:Must i find the speed with no Air resistance, calculate with the same equation and subtract the first answer from my second one? Which, to hope, will give me an answer of -4,6 Joule?
Air resistance is a force that opposes the motion of an object through air. It is caused by the friction between the object and the air molecules. In the case of a ball, air resistance can slow down its motion and change its trajectory.
The work done by air resistance on a ball can be calculated by multiplying the force of air resistance by the distance the ball travels. This can be represented by the equation W = F x d, where W is work, F is the force of air resistance, and d is the distance the ball travels.
No, air resistance does not always do work on a ball. If the ball is not moving, there is no work being done by air resistance. Similarly, if the ball is moving at a constant velocity, the work done by air resistance is zero because there is no change in the ball's kinetic energy.
The higher the speed of the ball, the greater the work done by air resistance will be. This is because the force of air resistance increases with the square of the ball's speed. Additionally, a larger surface area of the ball will result in a greater force of air resistance, and therefore, more work will be done on the ball.
Yes, the work done by air resistance on a ball can be negative. This occurs when the ball is moving in the same direction as the force of air resistance. In this case, the work done by air resistance is considered to be negative because the force is acting in the opposite direction of the ball's displacement.