During an experiment a student records the net horizontal force exerted on an object moving in a straight line along a horizontal frictionless track. The graph above shows the force as a function of time. Of the following, which is the best approximation of the magnitude of the change in momentum of the object between 0 s and 4 s?

A car and a small truck traveling at right angles to one another with the same speed collide and stick together. The truck's mass is roughly twice the car's mass. Sketch the direction of their momentum vector immediately after the collision. Explain your result.

A billiard player sends the cue ball toward a group of three balls that are initially at rest and in contact with one another. After the cue ball strikes the group, the four balls scatter, each traveling in a different direction with different speeds as shown in the figure below. If each ball has the same mass, 0.16 kg, determine the total momentum of the system consisting of the four balls immediately after the collision. (Assume v1 = 0.33 m/s, ?1 = 70°, v2 = 0.49 m/s, ?2 = 30°, v3 = 0.23 m/s, v4 = 0.48 m/s.)

A watermelon is blown into three pieces by a large firecracker. Two pieces of equal mass m fly away perpendicular to one another, one in the x direction another in the y direction. Both of these pieces fly away with a speed of V = 23 m/s. The third piece has three times the mass of the other two pieces. Write an expression for the speed of the larger piece, that is in terms of only the variable V.  What is the numeric value for the speed of the larger piece, in meters per second?  At what angle does the largest piece travel with respect to the -y axis, in degrees?

The figure below is for a 50 kg object v(m/s) 100.0 80.0 60.0 40.0 20.0 2.0 4.0 t(s) Find the acceleration. Find the net force. Find the velocity at t= 2.25 s. Find the momentum at t = 2.25 s. Find the displacement at t = 2.25 s.

The diagram shows the momentum vectors of two balls after they collide at the origin. Similar to experiment 8, only one ball was initially moving. Determine the magnitude of its initial momentum if the smallest square is 0.2 kg m/s. Format of answer: #.##. 7

A space probe is traveling in outer space with a momentum that has a magnitude of 7.32 x 107 kg-m/s. A retrorocket is fired to slow down the probe. It applies a force to the probe that has a magnitude of 1.42 x 106 N and a direction opposite to the probe's motion. It fires for a period of 8.39 s. Determine the momentum of the probe after the retrorocket ceases to fire.

Please help me understand the concept of this practice problem and how to work these types out. Thanks

At one particular moment, a 19.0 kg toboggan is moving over a horizontal surface of snow at 4.60 m/s. After 7.50 s have elapsed, the toboggan stops. Use a momentum approach to find the magnitude of the average friction force (in N) acting on the toboggan while it was moving. N

A stationary soccer ball of mass m = 0.72 kg is kicked with a constant force of F = 29 N. The woman's foot is in contact with the ball for t = 0.24 s a) Write an expression for the speed of the ball, vi, as it leaves the woman's foot. (b) What is the velocity of the ball right after contact with the foot of the woman?