What Am I?
Which has more momentum: a 1000kg car going 20m/s, or a 2000kg going 10m/s
they are equal
What impulse is required to change a 1000kg car’s velocity from 4m/s to 10m/s
6000 N s
What is the velocity of a 2kg object that falls 5m?
-10 m/s
How much work must be done to lift a 3.0 kg book from a table that is 1.0m high to a shelf that is 3.0m high?
60 J
What is “k” for a spring that requires 500g to compress it by 10cm?
50 N/m
What is the final velocity of a 4,000kg rail car that was traveling 5m/s when 1,000kg of coal is dumped into it?
4m/s
How much time is required for a 50N force to create an impulse of 25N?
0.50 sec
How far will a spring (k=200N/m) be compressed by an object moving horizontally with 2500 J of KE?
5m
How much work needs to be done on a car 800kg to stop it, if it has an initial velocity of 10.0m/s?
- 40,000 J
If a 1000 kg truck is traveling at 4m/s, how much work must be done by friction to stop it?
-8000 J
To determine if a collision is elastic or inelastic, you will check to see if _______ is conserved.
energy
What force is necessary to accelerate a 5kg object from rest to 4m/s in 2 sec.?
10 N
If you (70kg) compress a trampoline (5600 N/m) all the way to the ground (1.0m), how high above the ground will it launch you?
4 m
How much work is done by a force of 250N on a 10 kg desk to move it horizontally 6m, if the force is directed at an angle of -30o?
1300 J
Find the average power needed to push a 20 kg desk 10m in 5sec with a force of 413 N, when the floor has a static coefficient of friction of 0.45.
826W
•A ball (4kg) going 2m/s hits another initially stationary ball (8kg). After the collision, the lighter ball is not moving but the heavier one has a velocity of 1m/s. What kind of collision has just taken place? Show your work
8J ≠ 4J
inelastic
Why is bending your knees beneficial when landing a jump?
Increases the time of impact, thus reducing the force
If you (70kg) compress a trampoline (5600 N/m) all the way to the ground (1.0m), how fast will you be moving when you are 2m above the ground?
6.3 m/s
What is the net work done by two kids fighting over a toy at Christmas, if the toy is pulled to right with a force of 100N and to the left with a force of 75N, and the toy moves 2.0m to the right?
50 J
What is the coefficient of friction if a 2.0kg mass moving at 1.0m/s requires 0.50m to come to a stop?
0.10
A 10g bullet strikes and sticks in a ballistic pendulum (1.0kg) with a velocity of 200m/s. How high does the center of mass rise?
20 cm
If I (m = 80 kg) jump up with an average force of 800N and this takes 0.5sec, what is my max height above the ground?
1.28 m
If a 80kg man on a roller coaster goes down a 20m hill at an angle of 45o and then up a hill of 15m at an angle of 60o what is his change in kinetic energy?
3920 J
If a 4kg mass resting on a spring compresses it by 1.0 cm, how much work must be done to compress it by 10 cm?
20 J
Find the work done by a Force (F = 6x2 - 2x -7) over the interval x = 1 to x = 2.
4J