Physics: Forces And Motion: Units
Muhtasari
Every calculation in forces and motion relies on choosing the right units. Using metres when the question gives centimetres, or forgetting that acceleration is measured in metres per second squared, can cost easy marks on the exam.
This reference covers the seven SI units you need for the forces and motion section of the Edexcel specification: kilogram, metre, metre per second, metre per second squared, newton, second and newton per kilogram.
Malengo
- Use the following units: kilogram (kg), metre (m), metre/second (m/s), metre/second2 (m/s2), newton (N), second (s) and newton/kilogram (N/kg)
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- The SI unit of force is: A) kilogram B) metre per second C) newton D) joule Answer: C
- What is 72 km/h in m/s? A) 7.2 m/s B) 20 m/s C) 72 m/s D) 259.2 m/s Answer: B
- Acceleration is measured in: A) m/s B) m/s2 C) N/kg D) kg m/s Answer: B
- Which quantity is measured in N/kg? A) Weight B) Momentum C) Gravitational field strength D) Pressure Answer: C
- How many seconds are in 2.5 minutes? A) 25 s B) 120 s C) 150 s D) 250 s Answer: C
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