18 Questions
What is the kinetic energy of an object if its momentum is 25 kg.m/s?
275 J
What is the total momentum of a system consisting of multiple particles?
The vector sum of the momenta of individual particles
What is the relationship between the forces exerted by two particles on each other?
They are equal and opposite
What is the time rate of change of the total momentum of an isolated system?
Zero
What is a characteristic of the momentum of a particle?
It is a vector quantity
What is the effect of internal forces on the total momentum of a system?
They do not change the total momentum
What is a necessary condition for the conservation of momentum to be applicable in a system of particles?
The total external force acting on the system is zero.
In a two-dimensional problem, which components of a vector would you consider?
x- and y-components
What should you do when setting up a problem involving the conservation of momentum?
Define a coordinate system and label unknowns with algebraic symbols.
When writing the equation for the conservation of momentum, what do you equate?
Total initial momentum to total final momentum.
What is the symbol convention used for velocities before and after interaction?
Unprimed and primed letters, respectively, for velocities.
How many equations do you need to write when applying the conservation of momentum in two-dimensional problems?
Two equations, one for x-components and one for y-components.
What is the direction of the momentum vector of an object?
The same as the velocity vector
A car is traveling north at 20 m/s. If the car turns east and maintains the same speed, what happens to its momentum?
The direction of the momentum changes
An object has a kinetic energy of 200 J and a momentum of magnitude 10 kg.m/s. What is its speed?
4 m/s
What is the efficiency of an ideal machine?
100%
Two objects have the same kinetic energy. If object A has a mass of 2 kg and a speed of 4 m/s, what is the speed of object B if its mass is 4 kg?
2 m/s
A ball thrown by a major-league pitcher has a momentum of magnitude 20 kg.m/s. If the same ball is thrown by a child with a momentum of magnitude 10 kg.m/s, what is the ratio of the pitcher's speed to the child's speed?
2:1
This quiz covers the concepts of momentum, kinetic energy, and Newton's 2nd law of motion. It includes questions on the equations relating kinetic energy to momentum and the definition of linear momentum.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
