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. Read the following statement :"If no net force or net impulse acts on a system, the momentum of that system cannot change." What does it refer to? Law of Conservation of Momentum Law of Impulse Newton's 3rd Law Law of Momentum 2. What one characteristics of a bullet gives it its large momentumwhen fired from a hand-gun? Mass Velocity Shape Inertia 3. 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 4. A 50 kg Corvette (car) has a momentum of 500 kg m/s. How fast is the car going? 10 m/s 70 m/s 25,000 m/s 250 m/s 5. In a perfectly inelastic collision, a ball dropped from a certain height would bounce At the same height At a lesser height Would stick to the floor At a greater height 6. A 71.25 kilogram motorcycle is moving at a speed of 33.75 m/s. What is the momentum of the cycle? None of the above Equal to 200 kg m/s Greater than 200 kg m/s Less than 200 kg m/s 7. During a car collisiion the mometum of all moving object is changed. The change was in the speed of the moving objects. All moving objects (cars) came to rest. Which of these impulses would result in least injury to the vehicle passengers? When a very large force is applied for a very short period of time. When a small force is applied over a long period of time When a small force is applied for a very short time. When a large Force is applied for a long period of time. 8. The unit for the quantity "MOMENTUM" is __________ in the metric system. Kg m/s/s/s Kg m Kg m/s Kg m/s/s 9. What is true about impulse and momentum Momentum is the mass of a substance multiplied by the velocity while impulse is just the change of momentum Impulse is mass times velocity while momentum is force times time Momentum and impulse are unrelated to each other Impulse deals with velocity while momentum deals with change in velocity 10. What is the average force that a gun exerts on a bullet shot with an impulse of 14,000 N.s? Assume it took 0.4 s for the bullet to leave the barrel. 35,000N 5,600 N 56,000N 30,000 N 11. Because of the principle of conservation of momentum, a rocket can get rid of its empty stages To increase mass To decrease velocity To increase velocity To maintain velocity 12. Which of the following is the correct formula for calculating momentum of moving objects? P = m-V P = mV P = m + V P = m/V 13. The measure of how difficult it is to stop a moving object is known as the object's ______ Mass Momentum Inertia Velocity 14. When objects become tangled or stick together it is called an ________collision. Joint Elastic Inelastic Individual 15. How can defined change in momentum All of the above Force*change in time Impulse Mass*velocity 16. 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 greatest while the person sat in the chair. Was zero when the person got out of the chair and increased while the person sat. Was zero while stationary and increased when the person stood. Remained the same. 17. 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 red cue ball would have a velocity greater than 1.0 m/s The red cue ball would have a velocity of 0 m/s 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 18. The momentum of a body is equal to its mass multiplied by its velocity. True False 19. Relative between impulse and force Impulse=force/time Impulse=force*time All of the above Force=impulse*time 20. If your dog pulls the rope with 15 N force to the right and you pull the rope 5 N force to the left. What is the force and direction in Newtons of the final motion? 10 Newtons to the left 15 Newtons to the right 10 Newtons to the right 15 Newtons to the left 21. 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. A greater time for a change in momentum results in less force. 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. 22. In the marble-cup momentum lab, the velocity (speed) of the marble was increased by.... Decreasing the mass of the marble Moving the marble lower on the ramp (ruler). Increasing the mass of the marble. Moving the marble farther up the ramp (ruler). 23. A bat exerts a horizontal force on a 0.145-kg ball ofF(t) = [1.6t - 6t^2] between t = 0 and t = 2.50 sCalculate the impulse exerted by the bat on the ball at t=2.50s. -26.25N.s 33.5N.s 0N.s -33.5N.s 24. In the marble-cup momentum lab, the "distance the cup moved" was an indirect measurement for the marble's.... Velocity Momentum Acceleration Speed 25. What type of collision occurs when the objects bounce off of each other after making contact? Sticky collision Elastic collision Rebound collision Inelastic collision 1 out of 25 Time is Up! Time's up