Energy
What is the difference between potential and kinetic energy?
Potential energy is energy stored in an object or system. Kinetic energy is the energy an object has because it is moving.
What is the relationship between force and velocity?
The greater the force, the greater the change in velocity.
What's the difference between the magnetic field lines of attracting and repelling magnets?
attracting magnets connect and repelling magnets are separate
What kind of energy does a hand-crank require?
kinetic energy
Define system.
A set of interacting parts that forms a whole.
Which of the following is NOT an example of potential energy?
A. skateboard at top of ramp
B. water falling
C. charged battery
B. water falling
How does mass affect the velocity of an object?
The smaller the mass, the greater the change in velocity.
Where is potential energy stored in a magnet system?
converted and transferred
What caused the model spacecraft to go much faster on Wednesday?
The magnets were too close together.
What is the relationship between speed and kinetic energy?
Kinetic energy increases as speed increases.
How does potential energy get stored in a magnet system?
By moving the magnet AGAINST the magnetic force.
Describe how energy is converted when a hand-crank generator is used to power a battery.
kinetic to potential
Describe the direction and motion of the asteroid pod and the space station after they collided.
Both moved in opposite directions. The pod moved at a greater velocity because it has a smaller mass.
The greater the _________energy, the greater the ________energy.
potential--kinetic
What force acts in the opposite direction of a moving object?
Friction
How can you increase potential energy in magnets that are attracting?
Pull them farther apart.
Give an example of humans harnessing kinetic energy (besides a hand-crank generator)
backpack, rocking chair, knee brace, bike, compressing floor tiles
What are the four steps of the engineering design process?
Plan-Build-Test-Analyze
How is food like a battery? Use the words potential and kinetic in your response.
Food has potential energy stored in it just like a battery. This potential energy can be converted into kinetic energy and make things move.
When a pool ball hits a stationary cue ball of the same mass, what happens?
The pool ball stops and the cue ball moves in the same direction and speed as the pool ball was moving.
What happens to the potential energy when you pull repelling magnets further apart?
decrease potential energy
Place the following in order of energy transfer:
flashlight, hand-crank, battery, generator
hand-crank---generator---battery---flashlight
When a supply pod is dropped, name 2 ways the impact force can be decreased.
Lengthen collision time, decrease mass, increase air resistance, decrease velocity