4a-Energy resources and energy transfers Units Flashcards
unit for joules
Energy
Joule
J
unit for distance
Distance/Length
Metre
m
unit for speed/vel
Speed/Velocity
Metre per second
m/s
unit for acceleration
Acceleration
Metre per second squared
m/s²
unit for force
Force
Newton
N
unit for time
Time
Second
s
unit for power
Power
Watt
W
what does the unit represent Joule
Joule (J): Measures energy, the ability to do work.
what does the unit represent metre
Metre (m): Measures distance or displacement.
what does the unit represent meter per second
Metre per second (m/s): Measures speed or velocity.
what does the unit represent meter per second squared
Metre per second squared (m/s²): Measures acceleration, the rate of change of velocity.
what does the unit represent newton
Newton (N): Measures force, where 1 N = 1 kg·m/s².
what does the unit represent second
Second (s): Measures time.
what does the unit represent watt
Watt (W): Measures power, where 1 W = 1 J/s
Practical: Measuring Energy and Power
Measuring Work Done in Lifting an Object
Method: Measure the force applied (using a Newton meter) and distance moved.
Observation: Calculate work done using .
Practical: Measuring Energy and Power
Measuring Power Output of a Student
Method: Time how long a student takes to run up a flight of stairs and calculate energy transferred using .
Observation: Use to determine power output in watts.
