Physics Momentum & Collisions Concepts

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Questions and Answers

What is momentum?

  • The mass of an object divided by its velocity
  • The sum of mass and velocity
  • An object's weight multiplied by speed
  • The product of the mass and velocity of an object (correct)

What are the units of momentum?

kg * m/s

To have momentum, an object can be stationary.

False (B)

What two things make up momentum?

<p>Mass and velocity</p> Signup and view all the answers

Momentum is a scalar quantity.

<p>False (B)</p> Signup and view all the answers

What happens if you increase the time during an interaction?

<p>You decrease the force</p> Signup and view all the answers

What happens when a moving object collides with an object at rest?

<p>The momentum change of both objects is equal in magnitude</p> Signup and view all the answers

What is the Law of Conservation of momentum?

<p>Momentum is equal at start and finish</p> Signup and view all the answers

The greater the force acting on an object, the lesser the change in velocity.

<p>False (B)</p> Signup and view all the answers

The greater the change in velocity, the lesser the change in momentum.

<p>False (B)</p> Signup and view all the answers

What is impulse?

<p>Force x time</p> Signup and view all the answers

The greater the impulse, the lesser the change in momentum.

<p>False (B)</p> Signup and view all the answers

What does momentum have?

<p>Direction and magnitude</p> Signup and view all the answers

Momentum cannot change unless acted upon by an external force. True or False?

<p>true</p> Signup and view all the answers

When a quantity doesn't change, it is described as what?

<p>Conserved</p> Signup and view all the answers

What is an elastic collision?

<p>Collision where objects collide without being deformed and without generating heat</p> Signup and view all the answers

What is an inelastic collision?

<p>Collision where something becomes deformed and generates heat, also connected at the end of the collision</p> Signup and view all the answers

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Study Notes

Momentum Concepts

  • Momentum is defined as the product of an object's mass and its velocity.
  • The unit of momentum is expressed in kg * m/s.
  • An object must be in motion to possess momentum; it cannot be stationary or at rest.
  • Momentum consists of two primary components: mass and velocity (speed).
  • Momentum is a vector quantity, meaning it has both direction and magnitude.

Impulse and Forces

  • Increasing the time of force application results in a decrease of the required force.
  • When a moving object collides with a stationary object, the momentum change for both is equal in magnitude.
  • The Law of Conservation of Momentum states that the total momentum remains constant before and after a collision.

Effects of Force and Velocity

  • A greater force acting on an object leads to a more significant change in its velocity.
  • An increased change in velocity corresponds to a more considerable change in momentum.

Impulse Definition

  • Impulse is defined as the product of force and the time duration over which it acts.
  • A larger impulse results in a greater change in momentum.

External Forces and Conservation

  • Momentum will not change unless acted upon by an external force.
  • When a physical quantity remains unchanged over time, it is described as being conserved.

Types of Collisions

  • An elastic collision is one where the objects collide without deformation and do not generate heat.
  • An inelastic collision occurs when objects become deformed or generate heat, often resulting in them being connected post-collision.

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