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. 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. 2. In a perfectly elastic collision, a ball dropped from a certain height would bounce Would stick to the floor At the same height At a greater height At a lesser height 3. When comparing the momentum of two moving objects, which of the following is correct? The less massive object will have less momentum if the velocities are the same. The more massive object will have less momentum if its velocity is greater. The more massive object will have less momentum if the velocities are the same. The object with the higher velocity will have less momentum if the masses are equal. 4. The unit for the quantity "MOMENTUM" is __________ in the metric system. Kg m Kg m/s/s Kg m/s Kg m/s/s/s 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 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 0.5 m/s but less than 2m/s 6. Because of the principle of conservation of momentum, a rocket can get rid of its empty stages To increase velocity To maintain velocity To decrease velocity To increase mass 7. A 50 kg Corvette (car) has a momentum of 500 kg m/s. How fast is the car going? 10 m/s 25,000 m/s 250 m/s 70 m/s 8. 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. 5,600 N 56,000N 30,000 N 35,000N 9. What impulse occurs when an average force of 15 N is exerted on a cart for 3.0 s? 55 N.s 40 N.s 45 N.s 50 N.s 10. 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? 15 Newtons to the left 10 Newtons to the left 15 Newtons to the right 10 Newtons to the right 11. Elastic collision is Objects that collide and decrease their velocity Objects that collide and stick together Objects that collide and bounce off of each other None of the above 12. In a perfectly inelastic collision, a ball dropped from a certain height would bounce At a lesser height At the same height At a greater height Would stick to the floor 13. 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. 14. Two swimmers relax close together on air mattresses in a pool. One swimmer's mass is 48 kg, and the other's mass is 55 kg. If the swimmers push away from each other, Their total momentum decreases. Their momenta are equal but opposite. Their total momentum triples. Their total momentum doubles. 15. 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 when the person got out of the chair and increased while the person sat. Remained the same. Was greatest while the person sat in the chair. Was zero while stationary and increased when the person stood. 16. 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. False True 17. The measure of how difficult it is to stop a moving object is known as the object's ______ Inertia Momentum Velocity Mass 18. 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 33.5N.s 0N.s 19. When objects become tangled or stick together it is called an ________collision. Inelastic Elastic Individual Joint 20. A 10 kg body moving with 33m/s and the another body is moving with 55m/s with mass 2kg both body's collide with one other this is an completely inelastic collision. what is the final velocity after the collision 5.6m/s 12.6m/s 4m/s 27.5m/s 21. How can defined change in momentum All of the above Mass*velocity Force*change in time Impulse 22. In a two-body collision, Kinetic energy is always conserved. Neither momentum nor kinetic energy is conserved. Both momentum and kinetic energy are always conserved Momentum is always conserved. 23. Momentum has Magnitude only Magnitude and direction Force and Velocity Direction only 24. Which of the following objects have the least momentum? 3 Kg rock falling at 10 m/s 4 kg rock falling at 2 m/s 5 Kg rock not moving 2 kg rock falling at 3 m/s. 25. Which of the following is a way to decrease momentum? Increase impulse Increase velocity Increase force Increase friction 1 out of 25 Time is Up! Time's up
