28/03/2020 Dynamics – Momentum and Circular Motion(Senior Class Physics Study by Topics) 28/03/2020 0Comments by Gate Academy Welcome to your Dynamics - Momentum and Circular Motion(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. What is the momentum of a 15-kg rock rolling at 3 m/s? 0 kg m/s 5 kg m/s 18 kg m/s 45 kg m/s 2. In the marble-cup momentum lab, the velocity (speed) of the marble was increased by.... Increasing the mass of the marble. Moving the marble farther up the ramp (ruler). Moving the marble lower on the ramp (ruler). Decreasing the mass of the marble 3. Momentum has Direction only Force and Velocity Magnitude only Magnitude and direction 4. Which of these marbles would have the greatest momentum assumingthey all travel at the same velocity? 4.3 grams blue marble 6.2 gram white marble 4.8 grams red marble 2.3 gram clear marble 5. A 0.2 kg red cue ball rolling at 1.4 m/s elastically collides directly with a 0.2 kg 9-Ball at rest.Which of the following is true? The 9-ball would have a velocity greater than 2 m/s The 9-ball would have a velocity greater than 0.5 m/s but less than 2m/s The red cue ball would have a velocity of 0 m/s The red cue ball would have a velocity greater than 1.0 m/s 6. How can the momentum of a moving object be increased? Decrease the mass of the object. Decrease the object's velocity. Decelerate the object until it stops. Increase the mass of the object. 7. When objects become tangled or stick together it is called an ________collision. Individual Elastic Joint Inelastic 8. A 50 kg skateboarder is riding his 2.3 kg skateboard at a speed of 4 m/s.What is his momentum? Less than 100 kg m/s In between 100 and 200 kg m/s Greater than 200 kg m/s None of the above 9. Which of the following variables was assumed constant in both parts of the momentum lab where moving marbles moved an inverted plastic cup Velocity of the marbles. Mass of the marbles. Friction between the cup and the table Momentum of all the marbles. 10. Which of the following is a way to decrease momentum? Increase velocity Increase force Increase impulse Increase friction 11. What one characteristics of a bullet gives it its large momentumwhen fired from a hand-gun? Mass Velocity Inertia Shape 12. A small car (mass = 71.25 kilograms), moving at 52.5 m/s, crashes head on with a 285 kilogram truck moving at 33.75 m/s in the opposite direction (negative velocity). If the two cars become intertwined and mangled (inelastic), with what velocity does the wreckage move? (Don't forget direction!) A magnitude lesser than 30m/s moving in the initial direction of the car A magnitude lesser than 30 m/s moving in the initial direction of the truck A magnitude greater than 30 m/s moving in the initial direction of the truck A magnitude lesser than 30 m/s moving in the initial direction of the car 13. In a two-body collision, Both momentum and kinetic energy are always conserved Kinetic energy is always conserved. Momentum is always conserved. Neither momentum nor kinetic energy is conserved. 14. When comparing the momentum of two moving objects, which of the following is correct? The more massive object will have less momentum if its velocity is greater. The object with the higher velocity will have less momentum if the masses are equal. The less massive object will have less momentum if the velocities are the same. The more massive object will have less momentum if the velocities are the same. 15. Which of the following is the correct formula for calculating momentum of moving objects? P = mV P = m + V P = m/V P = m-V 16. What impulse occurs when an average force of 15 N is exerted on a cart for 3.0 s? 45 N.s 50 N.s 40 N.s 55 N.s 17. A bowling ball has 9 kg m/s of momentum when it is rolled 6 m/s. What is the mass of the bowling ball? 15 kg 3 kg 54 kg 1.5 kg 18. The momentum of a body is equal to its mass multiplied by its velocity. False True 19. What could be the momentum of a 1,300-kg car that moves at 4 m/s? 52 kg.m/s 5,200 kg.m/s 52 N 5,200 N 20. Why is falling on a floor with more give less dangerous than falling on a floor with less give? Because falling on a floor with more give causes less impact. Because falling on a floor with more give includes greater momentum. Because falling on a floor with less give comprises shorter time. Because the floor with more give allows a greater time for the impulse that reduces the momentum of fall to zero. A greater time for a change in momentum results in less force. 21. How can defined change in momentum All of the above Mass*velocity Impulse Force*change in time 22. The measure of how difficult it is to stop a moving object is known as the object's ______ Inertia Velocity Momentum Mass 23. A ball of mass 3kg is moving to the right with velocity 3m/s and a ball of mass 1kg is moving to the left with velocity 2m/s. we can use the principle of conservation of mass to determine the velocity of the other ball after the collision. True False 24. In the marble-cup momentum lab, the "distance the cup moved" was an indirect measurement for the marble's.... Velocity Acceleration Speed Momentum 25. A person sitting in a chair with wheels stands up, causing the chair to roll backward across the floor. The momentum of the chair Was zero while stationary and increased when the person stood. Was greatest while the person sat in the chair. Was zero when the person got out of the chair and increased while the person sat. Remained the same. 1 out of 25 Time is Up! Time's up
