Show:
Momentum
Impulse
Types of Collisions
Definition Review
Math/Equation Review
100
A 5 kg ball slides across a table with a velocity of 2m/s. What is its momentum?
10 Ns
100
What are BOTH units of impulse?
Ns and kgm/s
100
Both objects enter individually and leave individually.
Elastic Collision
100
What is average velocity?
Average velocity is the total displacement divided by the total time
100
What is the equation from gravitational potential energy?
PE= mgh
200
The total momentum of a system must be BLANK if no other outside forces act on it?
Conserved
200
If you want to increase the momentum of an object, what two elements of impulse could you increase to get your desired result?
Force and collision time
200
Two objects collide and stick together.
Perfectly inelastic
200
What is a vector?
A vector is a value that has both a magnitude and a direction.
200
What is Newton's Second Law?
F=ma
300
Two 3 kg balls roll towards each other with a speed of 3 m/s, before colliding. What is the initial momentum of the system?
0 Ns
300
A 50 kg wagon slows down from 2 m/s to rest. What is the impulse that caused this to happen?
-100 Ns or -100 kgm/s
300
Two objects that were originally connected and moving together pop apart and move in different directions.
Explosion
300
What is work?
Work is a force acting on an object over a distance.
300
If you know that the mechanical energy of an object is 200 J right now, what was its mechanical energy right after it was dropped?
200 J
400
Two identical balls roll towards each other at identical speeds, and then experience a perfectly inelastic collision. What is their final momentum?
0 Ns
400
You use an impulse of -200 Ns and a force of -75 N to stop a ball. How long does it take you to stop the ball?
2.67 s
400
A 2 kg block slides to the right with a velocity of +5m/s and collides with a 3 kg block that is still. After the collision, the 2 kg block is still and the 3 kg block is moving.
Elastic collision
400
What is inertia?
An object's resistance to changes to its motion.
400
What does the slope of a velocity vs time graph tell you?
Acceleration
500
A 2 kg ball is rolling to the right with a velocity of 5 m/s. A 4 kg ball is also rolling to the right, with a velocity of 2 m/s. If the 2 kg ball catches up and collides with the 4 kg ball, giving the 4 kg ball a final velocity of 3 m/s, what is the final velocity of the 2 kg ball?
3 m/s
500
A 1 kg ball is coming towards you with a velocity of +10 m/s. You hit the ball with a force of 200 N, staying in contact for 0.05 s. What is the final velocity of the ball?
20 m/s
500
Two cars crash into each other. During the collision, a loud sound is heard and the cars are significantly deformed.
Inelastic
500
What is projectile motion?
An object is moving through the air in two directions, with only gravity acting on the object.
500
Give two of the kinematic equations.
There are four kinematics. Any two separate, correct equations will work.