Momentum Calcs
What is the momentum of a 100 kg car traveling at 3.2 m/s [N]?
320 kg m/s [N]
What is the impulse if a 4 N force is applied to the right is applied for 10 seconds to a 6 kg mass?
40 N s [right]
8 N s [right]
A 2 kg cart rolling with a velocity of 3 m/s [R] strikes an identical cart at rest. If the two carts "stick" together, causing a completely inelastic collision, the velocity of the pair of carts after the collision is:
1.5 m/s [R]
The momentum of a 1200 kg car is 9600 kg*m/s [East]. The kinetic energy of the car is:
38 400 J
What is the total momentum of a 20 kg person traveling 3 m/s [W] and a 10 kg person traveling 5 m/s [E]?
10 kg m/s [W]
What is the change in momentum if a 4 N force is applied to the right for 10 seconds on a 5 kg object?
40 kg m/s[right]
A 4 kg ball hits the ground traveling at 3 m/s and bounces back at 2 m/s, what is the change of momentum of the ball?
20 kg m/s [up]
A 0.020 kg projectile traveling at 300 m/s strikes a 5.0 kg block of wood resting on a smooth surface. If the projectile exits the opposite side of the block at 200 m/s, find the speed of the block immediately following the collision:
0.4 m/s
A 2 kg cart rolling with a velocity of 3 m/s [R] strikes an identical cart at rest. If the two carts "stick" together, causing a completely inelastic collision, the kinetic energy after the collision is:
4.5 J
If the total momentum is 3 kg m/s [E], and the 4 kg object is moving at 3 m/s [W], what is the momentum of the other object?
15 kg m/s [E]
1.8 m/s [E]
A 6 kg ball hits the ground traveling at 5 m/s and bounces back at 3 m/s, and the impact time with the ground is 4 seconds, what was the force exerted on the ball?
12 N [up]
A 1200 kg car traveling at 30 m/s [N] runs into a 1000 kg car traveling at 25 m/s [S]. The collision is completely inelastic (sticky). What is the final velocity of the pair?
5 m/s [N]
A 4 kg block sliding at 5 m/s [R] hits a 2 kg block sliding at 2 m/s [L]. If the final velocity of the 2 kg block is 4 m/s [R], what is the initial kinetic energy BEFORE the collision?
54 J
What is the total momentum of a 5 kg object moving 4 m/s [S] and a 2 kg object moving 10 m/s [W]?
28 kg m/s [SW]
A 5 kg object is traveling at 6 m/s [right]. A force of 3N [left] is applied for 8 seconds. What is the final velocity?
1.2 m/s [right]
Explain, using concepts in this chapter, why, when you jump off a chair, you bend your knees as while you hit the ground.
The change in momentum is "fixed", so the impulse cannot be changed, but you can decrease the force on your knees by increasing the stopping time.
A 8 kg block traveling at 3 m/s [N] collides with a 6 kg block traveling at 4 m/s [E]. If they stick together, what is the final velocity of the pair?
2.24 m/s [NE]
A 4 kg block sliding at 5 m/s [R] hits a 2 kg block sliding at 2 m/s [L]. If the final velocity of the 2 kg block is 4 m/s [R], is the collision elastic or inelastic (show work to prove)
inelastic initial kinetic energy is 54 J, final is 24 J, so KEinitial>KEfinal