Lesson Collisions lessonWorksheet Collisions worksheetLab Collisions labTest Collisions testQuiz Collisions quizQuick answer: In a collision, the total momentum of the colliding objects is the same before and after, provided no outside net force acts. This AP Physics 1 quiz checks collisions with 10 multiple-choice questions and instant feedback; every answer comes with a short explanation.
The tests book with mark schemes · AP Physics 1
Every chapter in one PDF school book of 62 pages, to print or keep on your tablet.
See the book Ten multiple-choice questions on collisions and centre of mass. Choose one answer for each. Distractors come from typical mistakes such as mixing up energy and momentum or forgetting the signs of the velocities.
Level: AP Physics 1 (algebra-based) · Curriculum: AP P1 Unit 4
Which quantity is conserved in every collision between two objects when no external net force acts? A 2.0 kg cart at 3.0 m/s sticks to a stationary 1.0 kg cart. What is their speed afterwards? What distinguishes an elastic collision from an inelastic one? Two identical carts collide elastically head-on and one is initially at rest. What happens? A 1500 kg car and a 1500 kg car move towards each other at equal speeds and stick. What is their velocity after the collision? A student says kinetic energy decreased, so momentum was not conserved. What is wrong? Masses 1.0 kg at x = 0 and 3.0 kg at x = 0.40 m. Where is the centre of mass? The centre of mass of two colliding carts moves at 0.80 m/s before the collision. What is its velocity after, with no external net force? In a collision the speed of approach is 6.0 m/s and the speed of separation is 6.0 m/s. What type is it? Cart A loses 0.40 kg m/s of momentum in a collision with cart B. What is the change in momentum of B? Condition for conserved total momentum? — Zero net external force on the system. What is conserved in an elastic collision? — Both momentum and kinetic energy. What is conserved in an inelastic collision? — Momentum only; kinetic energy decreases. Final velocity when two objects stick together? — v = (m₁u₁ + m₂u₂) ÷ (m₁ + m₂). Elastic collision speed shortcut? — Speed of approach equals speed of separation. Centre of mass position formula? — x_cm = Σmx ÷ Σm. Centre of mass velocity formula? — v_cm = total momentum ÷ total mass. Why does v_cm stay constant in a collision? — Internal forces cancel; net external force is zero. Equal masses, elastic, one at rest? — They exchange velocities. Unit of momentum? — kg m/s (same as N s). Keep going with Lina
The tests book with mark schemes · AP Physics 1
Every chapter in one PDF school book of 62 pages, to print or keep on your tablet.
See the book 
