Momentum Archives • Nerd Notes

Home
Meet Phy
Learning Hub

All Resources

Everything you need to master Physics — for free.

AI Problem Solver

Meet Phy. The world's most advanced personal AI tutor.

UBQ

Learning supercharged. 1000+ Physics problems + AI help.

Speed Reviews

7 AP Physics 1 units condensed into 8 short articles.

AP Phys. Exam Prep

Proven tip, tricks, and hacks to help you score that coveted five.

Learn from Scratch

Learn Physics, from scratch at your own pace.
UBQ
Services

Elite 1-to-1 Coaching

Guaranteed performance boost in scores and understanding.

AP Exam Prep

5 weeks for a 5. Expedited progress. Stellar Results.

Learn AP Physics

1-to-1 lessons covering AP Physics from start to end.

All Other Programs

Other 1-to-1 and group programs to accelerate Physics mastery.
Pricing
Jobs

What we found:

A bullet moving with an initial speed of $v_o$ strikes and embeds itself in a block of wood which is suspended by a string, causing the bullet and block to rise to a maximum height $h$ . Which of the following statements is true of the collision.

In which of the following is the rate of change of the particle’s momentum zero?

If you want to double the momentum of a gas molecule, by what factor must you increase its kinetic energy?

A moderate force will break an egg. However, an egg dropped on the road usually beaks, while one dropped on the grass usually does not break because for the egg dropped on the grass:

In the figure, determine the character of the collision. The masses of the blocks, and the velocities before and after, are shown. The collision is

A 0.10-kg ball, traveling horizontally at 25 m/s, strikes a wall and rebounds at 19 m/s. What is the magnitude of the change in the momentum of the ball during the rebound?

A rubber ball bounces off of a wall with an initial speed v and reverses its direction so its speed is v right after the bounce. As a result of this bounce, which of the following quantities of the ball are conserved? (There could be more than one correct choice.)

A rubber ball and a lump of clay have equal mass. They are thrown with equal speed against a wall. The ball bounces back with nearly the same speed with which it hit. The clay sticks to the wall. Which one of these objects experiences the greater momentum change?

A rocket explodes into two fragments, one 25 times heavier than the other. The magnitude of the momentum change of the lighter fragment is

A 15-g marble moves to the right at 3.5 m/s and makes an elastic head-on collision with a 22-g marble. The final velocity of the 22-g marble is 2.0 m/s to the right, and the final velocity of the 15-g marble is 5.4 m/s to the left. What is the initial velocity of the 22-g marble?

A 1.0-kg object is moving with a velocity of 6.0 m/s to the right. It collides and sticks to a 2.0-kg object moving with a velocity of 3.0 m/s in the same direction. How much kinetic energy was lost in the collision?

Two ice skaters suddenly push off against one another starting from a stationary position. The 45-kg skater acquires a speed of 0.375 m/s relative to the ice. What speed does the 60-kg skater acquire relative to the ice?

A golf club exerts an average horizontal force of 1000 N on a 0.045-kg golf ball that is initially at rest on the tee. The club is in contact with the ball for 1.8 ms. What is the speed of the golf ball just as it leaves the tee?

A 1200-kg car moving at 15.6 m/s suddenly collides with a stationary car of mass 1500 kg. If the two vehicles lock together, what is their combined velocity immediately after the collision?

A block of mass M1 travels horizontally with a constant speed v0 on a plateau of height H until it comes to a cliff. A toboggan of mass M2 is positioned on level ground below the cliff as shown above. The center of the toboggan is a distance D from the base of the cliff.

A super dart of mass 20 g, traveling at 350 m/s, strikes a steel plate at an angle of 30° with the plane of the plate, as shown in the figure. It bounces off the plate at the same angle but at a speed of 320 m/s. What is the magnitude of the impulse that the plate gives to the bullet?

A 1000 kg car is traveling east at 20m/s when it collides perfectly inelastically with a northbound 2000 kg car traveling at 15m/s. If the coefficient of kinetic friction is 0.9, how far do the two cars skid before coming to a stop? Also, what angle do they travel at?

A 4 kg mass is traveling at 10 m/s to the right when it collides inelastically with a stationary 7 kg mass. The 7 kg mass then travels at 2m/s at an angle of 22° below the horizontal. What are the velocity and the angle of the 4 kg mass?

A 2kg object slides east at 4 m/s and collides with a stationary 3 kg object. After the collision, the 2 kg object is traveling at an unknown velocity at 15° north of east and the 3 kg object is traveling at 38° south of east. What is each object’s final velocity?

Car A, mass 1000 kg, is traveling at 40 m/s when it collides with a stationary car B. They stick together and travel at 7 m/s. What is the mass of car B?

A platform is initially rotating on smooth ice with negligible friction, as shown at left in the figure. A stationary disk is dropped directly onto the center of the platform. A short time later, the disk and platform rotate together at the same angular velocity, as shown at right in the figure. How does the angular momentum of only the platform change, if at all, after the disk drops? What is a justification for your answer?

A 20 g piece of clay moving at a speed of 50 m/s strikes a 500 g pendulum bob at rest. The length of a string is 0.8 m. After the collision the clay-bob system starts to oscillate as a simple pendulum.

A fisherman is standing in the back of his small fishing boat (the mass of the fisherman is the same as the mass of the boat) and he is a few meters from shore. He is done fishing so he starts walking towards the shore so he can get off the boat. What happens to the boat and the fisherman? Select all that apply and assume there is no friction between the boat and the water.

A karate master is about to split a piece of wood with her hand. Select all she must do in order to deliver the maximum force to split the wood.

A kickball is rolled by the pitcher at a speed of 10 m/s and it is kicked by another student. The kickball deforms a little during the kick, and then rebounds with a velocity of 15 m/s as its shape restores to a perfect sphere. Select all that must be true about the kickball and the kicking foot system.

A steel ball and a piece of clay have equal masses. They are dropped from the same height on horizontal steel platform. The ball bounces back with nearly the same speed with which it hit. The clay sticks to the platform. Choose all that is true about the ball/platform and the clay/platform systems.

A block of mass m is moving on a horizontal frictionless surface with a speed $v_0$ as it approaches a block of mass $2m$ which is at rest and has an ideal spring attached to one side. When the two blocks collide, the spring is completely compressed and the two blocks momentarily move at the same speed, and then separate again, each continuing to move.

A bullet at speed v_0 hits and embeds into a wood block hanging from a string, which rises height h. Which is true about the collision?

An astronaut initially at rest in space throws a wrench, and recoils in the opposite direction. Select all that is true.

A block with mass m slides at speed $v_0$ on a smooth surface and hits a stationary block with mass M. They stick together and move at speed $v_0/3$ . Find M in terms of m.

Two identical blocks are connected to the opposite ends of a compressed spring. The blocks initially slide together on a frictionless surface with velocity v to the right. The spring is then released by remote control. At some later instant, the left block is moving at v 2 to the left, and the other block is moving to the right. What is the speed of the center of mass of the system at that instant?

A 70 kg woman and her 35 kg son are standing at rest on an ice rink, as shown above. They push against each other for a time of 0.60 s, causing them to glide apart. The speed of the woman immediately after they separate is 0.55 m/s. Assume that during the push, friction is negligible compared with the forces the people exert on each other.

A firecracker in a coconut blows the coconut into three pieces. Two pieces of equal mass fly off south and west, perpendicular to each other, at 18 m/s. The third piece has 2.5 times the mass as the other two.

A bowling ball moving with speed v collides head-on with a stationary tennis ball. The collision is elastic, and there is no friction. The bowling ball barely slows down. What is the speed of the tennis ball after the collision?

Consider the following cases of inelastic collisions. Case (1) – A car moving at 75 mph collides with another car of equal mass moving at 75 mph in the opposite direction. Case (2) A car moving at 75 mph hits a stationary steel wall. The collision time is the same for both cases. In which of these cases would result in the greatest impact force?

A 2,000kg car collides with a stationary 1,000 kg car. Afterwards, they slide 6 m before coming to a stop. The coefficient of friction between the tires and the road is 0.7. Find the initial velocity of the 2,000kg car before the collision?

A 3800 kg open railroad car coasts along with a constant speed of 8.60 m/s along a level track. Snow begins to fall vertically and fills the car at rate of 3.50 kg/min. Ignoring friction with the tracks, what is the speed of the car after 90 min?

A 4 kg mass is traveling at 10 m/s to the right when it collides elastically with a stationary 7 kg mass. The 7 kg mass then travels at 2 m/s at an angle of 22° below the horizontal. What is the velocity of the 4 kg mass?

A baseball, mass 0.5 kg, is traveling to the right at 32.2 m/s when it is hit by a bat and travels the opposite direction at 72.2 m/s. The bat hits the ball with a force of 1,222 N. What is the ball’s change in momentum and how long was the ball in contact with the bat?

A pool cue ball, mass 0.7 kg, is traveling at 2 m/s when it collides head on with another ball, mass 0.5 kg, traveling in the opposite direction with a speed of 1.2 m/s. After the collision, the cue ball travels in the opposite direction at 0.3 m/s. What is the velocity of the other ball?

A child (mass 32 kg) in a boat (mass 71 kg) throws a 7.1 kg package out horizontally with a speed of 12.2 m/s. Calculate the velocity of the boat immediately after, assuming it was initially at rest. Ignore water resistance.

A bullet of mass 0.0500 kg traveling at 50.0 m/s is fired horizontally into a wooden block suspended from a long rope. The mass of the wooden block is 0.300 kg and it is initially at rest. The collision is completely inelastic and after impact the bullet+ wooden block move together until the center of mass of the system rises a vertical distance h above its initial position.

Block 2 initially is at rest. Block 1 travels towards block 2 and collides with Block 2 as shown above. Find the final velocities of both blocks assuming the collision is elastic.

A 0.035 kg bullet moving horizontally at 350 m/s embeds itself into an initially stationary 0.55 kg block. Air resistance is negligible.

Two boxes are tied together by a string and are sitting at rest on a frictionless surface. Between the two boxes is a massless compressed spring. The string trying the two boxes is then cut and the spring expands, pushing the boxes apart. The box on the left has four times the mass of the box on the right.

A truck going 15 km/h has a head-on collision with a small car going 30 km/h. Which statement best describes the situation?

A 75.0kg log floats downstream with a speed of 1.80 m/s. Eight frogs hop onto the log in a series of perfectly inelastic collisions. If each frog has a mass of 0.30 kg and an upstream speed of 1.3 m/s, what is the change in kinetic energy for this system?

An object at rest suddenly explodes into two fragments by an explosion. One fragment acquires 3 times the kinetic energy of the other. What is the ratio of their masses?

A rubber ball with a mass of 0.25 kg and a speed of 19.0 m/s collides perpendicularly with a wall and bounces off with a speed of 21 m/s in the opposite direction. What is the magnitude of the impulse acting on the rubber ball?

Refer to the diagram above and solve all equations in-terms of R, M, k, and constants. What is the speed mass 2M as it reaches point B? Calculate the tension in the string supporting mass 2M as it reaches point B. Mass 2M collides with a smaller mass M at point B. After the collision, mass 2M has a speed equal to 1/3 its original value before the collision. What is the speed of mass M after the collision? Mass M then moves along the ground without friction with the speed found in #3 above, until it collides with the spring. Determine the maximum compression of the spring at C.