| Units | Momentum | Impulse | Work, Power and Collisions | Energy |
|---|---|---|---|---|
|
m/s/s
What is the unit for acceleration?
|
Mass in motion
What is the definition of momentum?
|
A change in momentum (force over a time interval).
What is an impulse?
|
Elastic is when objects bounce apart and inelastic is when they stick together.
What is the difference between an elastic and inelastic collision?
|
U = 10 J.
What is the potential energy of a 20 kg object that is 0.5 m above the ground?
|
|
(kg x m)/s/s
What is a Newton?
|
0 Ns
What is the momentum of a 10,000 kg truck sitting at a stoplight?
|
Bouncing means a greater change in momentum, and so a greater impulse. With a constant impact time, the force most increase.
Why does an object experience a greater force when it bounces?
|
W=2000 J
How much work is done by lifting a 20 kg block 10 m off the ground?
|
v = 15 m/s.
What is the final velocity of a ball that starts out traveling at 15 m/s in which no work is done on it?
|
|
N x s
What is the unit for momentum?
|
0.1 Ns
What is the momentum of a 0.5kg marble rolling at 2 m/s?
|
Increase the impact time, which increases the impulse.
In baseball, why do hitters follow through when they swing at a pitch?
|
d = 6 m
How high is a 5 kg block lifted if it takes 5 s and 60 W of power?
|
v =42.4 m/s.
An archer does 225 J of work on a bow. What is the arrow's final velocity after being fired?
|
|
N x m
What is a Joule?
|
-40,000 N
A 500 kg car drives toward a wall with speed 20 m/s. It hits the wall and stops in 0.25 s. What is the force of impact?
|
Both have the same impulse since the change in momentum is the same for both. The wall, though, has a smaller impact time, and so a greater force.
Explain why when an egg is thrown at a sheet and a wall with speed v, the egg breaks when it hits the wall but not the sheet.
|
W = -200,000 J
An object has 200,000 J of kinetic energy. How much work is needed to stop it?
|
U = 360 J.
A monkey holds a 5 kg coconut 45 m above the ground in a palm tree. What is its potential energy after it has fallen 2.75s?
|
|
N/s
What is a Watt?
|
change in momentum = -3.01 Ns
impact force = -376.25 Ns
If a ball of mass 0.07 kg travels at 24 m/s and bounces off a wall with speed 19 m/s in the opposite direction, what is its change in momentum? If the impact time is 0.008s, what is the impact force?
|
F= -5333.3 N
A truck traveling of mass 2500 kg has initial momentum 32,000 Ns. If it applies its brakes for 6 s to come to a stop, what is the net force needed to stop the truck?
|
v = 3 m/s.
If 5 kg ball traveling at 5 m/s collides with a 10 kg ball traveling 2 m/s in the same direction, what is the final velocity of the 5 kg ball if the 10 kg ball ends up going 3 m/s?
|
v = 44.7 m/s.
A roller coast cart of mass 500 kg starts at a height of 200 m above the ground. If, after a series of twists and turns, it comes to a loop, what is the velocity of the cart at the top of the loop which is 100 m above the ground?
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