Momentum
What does the impulse delivered to an object equal?
The change in the object's momentum
The force acting on the object
The weight of the object
The object's kinetic energy
A 5 kg object moving at 2 m/s collides with a stationary 10 kg object in an isolated system; what is the velocity of the 10 kg object immediately after if the collision is perfectly elastic?
1.33 m/s
-2 m/s
0 m/s
-1 m/s
What happens to the total system momentum when two ice skaters initially at rest push off each other on frictionless ice?
It increases due to action-reaction forces between them during pushing off.
It remains zero before and after they push off each other.
It decreases since they move in opposite directions after pushing off each other.
It depends on who pushes harder during separation from contact with one another.
An object gained an impulse of 10 Ns by a force of 5 newtons. How many seconds did the force act on the object?
1 s
5 s
10 s
2 s
What SI unit is used to measure momentum?
Kilogram-meter per second (kg·m/s)
Newton-second (N·s)
Meters per second squared (m/s²)
Joules (J)
What is the SI unit for momentum?
Kilogram meter per second (kg·m/s)
Joule (J)
Newton second (N·s)
Watt (W)
A ball is dropped from rest; what impulse must be imparted by the ground to bring it to rest if it bounces back up without losing any kinetic energy?
Twice its change in momentum upon impact with ground
Zero, because it does not lose any kinetic energy
Equivalent to its change in momentum upon impact with ground
Equal to its weight

How are we doing?
Give us your feedback and let us know how we can improve
If the value of the gravitational constant (G) were to be doubled, how would this affect the impulse experienced by a ball of mass m, initially at rest, as it falls freely from height h before colliding with a soft clay surface?
The impulse would quadruple because both gravitational force and acceleration due to gravity are doubled, which affects momentum change proportionally.
The impulse would double since doubling G increases the force of gravity acting on the ball, resulting in greater change in momentum.
The impulse would be halved as an increase in gravitational constant results in an increased impact velocity that proportionally reduces the time interval during collision.
The impulse would remain unchanged because impulse is independent of G and only depends on the ball's change in momentum.
What is impulse?
the mass of an object times its velocity
2 pi times the square root of m/k
the average force on an object multiplied by the time in which that force acts.
the moment of inertia times the angular acceleration
How does the concept of impulse change for a system with variable mass, such as a rocket expelling fuel in order to maintain its linear momentum?
Change in momentum is solely determined by the total fuel expelled regardless of system mass variations.
Constant mass expressions for impulse and momentum can still be used without adjusting for changing rocket-fuel system.
Rockets remain at a constant speed due to thrust balancing out mass loss; therefore, impulse concepts are not applicable.
The change in momentum depends on the variables of the system, such as system mass as well as the velocity of the expelled fuel.