Physics - Springs, Energy & Power!

Springs

100

Spring #1 has a k=1.4N/m and Spring #2 has a k=2.0N/m. What about these springs makes them different?

The elasticity of the spring... The "girth" or "thickness" of the coil

200

F_s=-kx

What is "x" in this equation?

The displacement of the spring (the length it's stretched)

300

This equation measures the elastic energy in a spring.

E_el=1/2kx²

400

A spring with a constant of k=2.0N/m is stretched 25cm. This is the force the spring holds in it now. 

F_s=-0.5N
(It's negative!)

500

A spring get's compressed 0.5m and now contains 1.2J of elastic energy. This is the spring's constant (k)

k=9.6N/m

Energy Concepts

100

Equation for potential energy

E_g=mgh

200

Equation for Kinetic Energy

E_k=1/2mv²

300

The kind of energy a wheel of cheese has before it rolls down a hill

"Potential" energy

400

A pendulum is dropped from 90^o. Draw an energy graph comparing E_g & E_k when the pendulum is at 45^o

Graph shows 50/50 E_g to E_k

500

If a ball is thrown straight up into the air. This point in its trajectory will it have the most potential energy

At the top

Energy Math

100

A 20kg rock falls off a 10m cliff. It started with this much potential energy

2000J

200

A 20kg rock falls off a 10m cliff. It will have this mass when it hits the ground

20kg

300

A 1200kg Ford Mustang has this much kinetic energy when it hits 30 m/s

540kJ

400

A 5kg RC car rolls down a 10m ramp and hits a spring that then compresses. If it compresses 2m, what is the spring's constant?

k=250N/m

500

A 2kg ball drops from a height of 5m and bounces back up 4m. How many Joules of energy did it lose when it hit the ground?

20J

Power

100

The equation for power

P=E/t

200

This is the unit we use for Power (spell it out!)

Watts

300

10N of force is applied to move a box 2m. It takes 5 seconds to do this. This much power was used

4W

400

A powerlifter deadlifts 500kg one meter up in 5 seconds. They used this much power to lift this

1000W

500

You need this variable in an energy problem to know you're working with a certain amount of power

Time (s)

Misc

100

One equation from this unit

Show me!

200

Name one lab from this grading period

Spring Lab
Balloon Car Lab
Pendulum Lab

300

A tennis ball and a bowling ball are both dropped from a 10m platform. This object has more Kinetic energy when it hits the ground

Bowling ball

400

This team won the 2022 NCAA tournament

Kansas Jayhawks

500

What's the capital of the Netherlands?

Amsterdam