![]() ![]() On the 10 kg mass, there is a force of 10 N in the positive x direction. On the 2 kg mass, there is a force of 5 N inclined 45o above horizontal. Finally, on the 5 kg mass, there is a force of 2 N in the negative y direction. Two masses, m1 and m2, m1 being larger, are connected by a spring.įind the resultant acceleration of the system. In what direction does the system travel? They are placed on a frictionless surface and separated so as to stretch the spring. A 50 kg man stands at the edge of a raft of mass 10 kg that is 10 meters long.The edge of the raft is against the shore of the lake. How far from the shore does the raft move? The man walks toward the shore, the entire length of the raft.We shall define this concept, force applied over a time period, as impulse.Impulse can be defined mathematically, and is denoted by J: J= FΔt.Can we predict the motion of an object? J = FΔt = (ma)Δt J = m Δt J = mΔv = Δ(mv) = mvf - mvo.What is the impulse of a force of 10 N acting on a ball for 2 seconds?.The ball has a mass of 2 kg and is initially at rest.What is the velocity of the ball after the force has acted on it?.From our equation relating impulse and velocity, it is logical to define the momentum of a single particle, denoted by the vector p, as such: p= mv.Again, momentum is a vector quantity, pointing in the direction of the velocity of the object.From this definition we can generate two every important equations, the first relating force and acceleration, the second relating impulse and momentum.A particle has linear momentum of 10 kg-m/s, and a kinetic energy of 25 J.Relation between force and acceleration:.If we take a time derivative of our momentum expression we get the following equation.A 2 kg bouncy ball is dropped from a height of 10 meters, hits the floor and returns to its original height.What was the change in momentum of the ball upon impact with the floor? What was the impulse provided by the floor?.A ball of 2 kg is thrown straight up into the air with an initial velocity of 10 m/s. ![]()
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |