Simple Harmonic Motion
Springs
Pendulums
In Real Life
Energy
Final
100
An object is said to be in equilibrium when _________?
The net force is 0.
100
The equation that defines the force exerted by a spring according to Hooke's law
F_s = kx
100
What two forces act on a pendulum AT ALL TIMES?
Tension and weight (gravity)
100
A grandfather clock functions due to a calibrated pendulum. Each swing of the pendulum causes the second hand to move. What is the period (T) of the pendulum?
1 s
100
The equation that describes the amount of energy contained in a compressed or elongated spring
PE_s=\frac{1}{2}kx^2
200
what is the time required for an object to complete one full cycle of motion.
The period.
200
Suppose a spring has a spring constant of 500 N/m and is stretched by 0.2 meters. What is the force applied?
100 N
200
What variable is used to show the magnitude of displacement from equilibrium in a pendulum?
θ (angle)
200
A wrecking ball can be considered a pendulum. During which portion of its swing would you want to have it make contact with a building?
It's equilibrium position. (The lowest point in the swing)
200
What is the total potential energy within a spring when its elongation is 0 m?
0 J
300
What is the general name for the force that always acts to bring an oscillating object back to equilibrium?
The restoring force.
300
What type of energy is stored in a compressed or stretched spring?
(Elastic) potential energy
300
What type of energy is at a maximum when the pendulum is at its maximum distance from equilibrium?
Potential
300
In a car crash, assuming the bumper acts like a spring and has a spring constant of 10,000 N/m. How much energy is absorbed if the bumper compresses 0.4 m?
1600 J
(If a 70kg [154 lbsw] person had that energy, they would be moving at 4.8 m/s [10.5 mph])
300
If there is no friction present in a simple harmonic motion, what happens to the total mechanical energy?
Remains constant
400
This word is used to describe the maximum displacement from equilibrium
Amplitude
400
If you were given a force vs. elongation graph, what would the slope of the line represent?
The spring constant, k
400
If we remain on earth, the pendulum's period is only dependent on this.
Length
400
A spring scale is used to measure the weight of objects. If the spring constant is 1000 N/m and the spring elongates by 3 cm, what is the object's MASS?
3 kg (3.061)
400
If a 200 N/m spring is stretched 0.20 m, this is the elastic potential energy stored in it
4 J
500
The term is used to describe a simple harmonic motion when friction is present, and the object eventually stops.
Damping (Damped harmonic motion)
500
A spring with a higher value of k is considered to be a (Stiff or Soft) spring?
Stiff
500
What component of weight is equal to the restoring force in a pendulum?
Horizontal component
500
During a bungee jump, an individual weighing 686 N (70 kg) jumps off a bridge. The spring constant of the cord is 5 N/m. If the equilibrium length of the cord is 150 m, what is the total distance the individual will fall?
287.2 m (x = 137.2 m)
500
If you are given a force vs. elongation graph, the area under the curve represents what quantity.
The work done to compress or stretch the spring.
500
What is the spring constant of a block attached to a compressed spring if the spring is compressed by 15 cm, the block is 2.5 kg, and the block accelerates at 3 m/s^2 when released?
50 N/m