Regents Prep: Physics
Multiple-Choice Questions
Regents Prep Physics: Topical Multiple-Choice Question Archive
Use of Topical Archive Multiple-Choice Questions
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Momentum: Question 1 of 2
A 1,200-kilogram car traveling at 10. meters per second hits a tree and is brought to rest in 0.10 second. What is the magnitude of the average force acting on the car to bring it to rest?
  1. 1.2 × 102N
  2. 1.2 × 103N
  3. 1.2 × 104N
  4. 1.2 × 105N

Correct Answer Number: 4

Explanation: Impulse = change in momentum, J=delta p or Ft = mv. We are given m, v and t. Plug numbers in and solve for F.


Momentum: Question 2 of 2
information below. A 2.0 × 103-kilogram car travels at a constant speed of 12 meters per second around a circular A 1.2-kilogram block and a 1.8-kilogram block are initially at rest on a frictionless, horizontal surface. When a compressed spring between the blocks is released, the 1.8-kilogram block moves to the right at 2.0 meters per second, as shown.

What is the speed of the 1.2-kilogram block after the spring is released?
 

  1. 1.4 m/s
  2. 2.0 m/s
  3. 3.0 m/s
  4. 3.6 m/s

Correct Answer Number: 3

Explanation: The momentum of the system before is equal to the momentum of the system after or m1v1 = m2v2

v1 = m2v2/m1.
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