Impulse
Momentum 1
Momentum 2
Random
Problems
100
The units for momentum and impulse
kg m/s or N*s
100
Calculate the momentum of a 14 kg object moving at a velocity of 2.0 m/s to the right.
28 kg m/s to the right
100
True or False: Momentum is a scalar.
False, momentum is a vector!
100
This scalar is measured in seconds.
What is time?
100
A 1500 kg car travels at an initial velocity of 12 m/s east direction. Then it receives an impulse (east direction) of 3000 kgm/s. How much is the final velocity of the car (magnitude and direction)?
14 m/s
200
State the formula of Impulse in function of Force
J = F*t
200
Calculate the velocity of 10 kg koala bear that has a momentum has the same momentum as a 68 kg kangaroo moving at 19.2 m/s to the right.
130.6 m/s to the right
200
What is Momentum (by definition) ?
The ability to move bodies
200
To define momentum (magnitude and direction) which of the following 2 quantities would you use (?):
- Speed
- Velocity
Velocity
200
The net force on an objcet that has changed its momentum is 360 N to the left. If the received impulse is equal to 1800 N*s, find:
- the time interval in which the momentum has changed.
- the direction of the Impulse.
t=5 s,
Impulse direction = to the left as the Net Force
300
Impulse is synonymous to this.
Change in momentum.
300
A roller-skater skates at a speed of 40.3 km/h. If the skater's momentum is 660 kg m/s, calculate his mass.
59 kg
300
What is the symbol of Momentum? Write on the whiteboard
p
300
This vector is a push or pull that can cause acceleration.
What is Force?
300
A car with a mass of 1100 kg collides head-on (head on means frontal impact - the head of one versus the other's) with a van having a mass of 2500 kg traveling 8 m/s. As a result of the collision, the vehicles lock together and immediately come to rest. Calculate the speed of the car immediately before the collision.
18.2 m/s toward the Van.
400
Which case, A or B, has the largest impulse
Case B
400
To have Momentum, you must have Velocity and ...
Mass
400
Two different arrows are shot.
Arrow 1: m = 2 kg, v = +10 m/s
Arrow 2: m = 1 kg, v = -20 m/s
Compare their momentum (magnitude and direction).
Momentum is the same in magnitude and opposite in direction.
400
This vector is the rate of change of velocity.
Acceleration
400
A golfer strikes a golf ball of mass 0.05 kg, and the time of impact between the golf club and the ball is 1.0 ms (1 milli second). If the ball acquires a velocity of magnitude 70 m/s, calculate the average force exerted on the ball.
3500 N
500
The formula of Impulse that uses Force is arisen by which of the 3 Newton's laws?
The 2nd : F(net) = m*a
500
Two ice skaters, Skater A and Skater B, are initially at rest and in contact with each other on frictionless ice. They push off from each other.
Question: Describe the momentum of each skater after they push off. What can you say about the total momentum of the system?
Their momentum will be equal in magnitude and opposite in direction
500
Which of the following has the highest momentum?
A 1000 kg car moving at 5 m/s
A bullet of 0.6 kg moving at 10000 m/s
The buller has higher momentum
500
Why is Impulse a Vector?
Because it is the difference between 2 vectors (or the multiplication of a vector times a scalar)
500
Two bumper cars collide in a straight line along the east direction.
Car A has a mass of 550 kg and is moving east at 3.7 m/s.
Car B has a mass of 450 kg and is moving east directly behind Car A at 4.5 m/s.
After the collision, Car A speeds up to 4.4 m/s east.
What is the final velocity (magnitude and direction) of Car B?
(approx) 3.6 m/s east