PE vs. KE
A ball is sitting still at the top of a hill
what type of energy and why?
Potential - it is stored because it is not moving
A lamp is plugged in and turned on
Name the 2 types of energy
Electrical + Radiant
Food - Running
Chemical - Mechanical
Forces are equal. what happens?
No movement = Balanced
10N right - 10N left
0N (no movement)
A skateboarder is going down a ramp
What type of energy and what is happening to it?
Kinetic - energy is increasing as they move
A person eats food and the goes for a run
What energy type is stored and what is used?
Chemical - Mechanical
Battery - Phone - Light
Chemical - Electrical - Radiant
A box moves to the right
What does this tell you about the forces?
They are unbalanced - The forces are stronger to the right
20N right - 5N left
A stretched rubber band is released
What 2 types of energy are involved?
Elastic - Mechanical (Kinetic Energy)
A trampoline is stretched and then someone jumps
What energy types are involved?
Elastic + Mechanical
Coal is burned to make electricity
What energy changes?
Chemical - Thermal - Electrical
A student pushes a desk, but it doesn't move.
Why?
Forces are balanced
30N left - 10N right
20N left
A rollercoaster at the top starts moving down
What energy change is happening?
Gravitational - Kinetic
A heater warms up a room
What types of energy is being transferred?
Thermal
A microwave heats food
Electrical - Thermal
Explain how balanced forces are different from unbalanced forces
Balanced = equal forces - it doesn't move
Unbalanced = not equal - it moves
50N right - 25N left
25N right
Can an object have BOTH potential and kinetic energy at the same time? Explain
Yes - moving object can still have stored energy
Give 1 example of an object using 3 types of energy
Flashlight = Chemical (Battery) - Electrical (turns on) - Radiant (Light)
A Blender mixes fruit
Name the 2 energy changes
Electrical - Mechanical
A car speeds up
What happened to the forces?
Unbalanced forces increased
12N up - 8N down
4N up