Electromagnets

• What is the formula to calculate weight from mass?

  Weight = mass x gravitational field strength
• If the mass is 60 kg, what is the weight?

  600 N
• How do you calculate pressure?

  Pressure = force / area
• What is the pressure if the weight is 600 N and the area is 4 m²?

  150 N/m²
• What is the pressure for a mass of 134 kg and area of 4 m²?

  • Weight = 134 kg x 10 = 1340 N
  • Pressure = 1340 N / 4 m² = 335 N/m²
• What is the correct equation for moments?

  Moment = force x distance
• What happens to gas pressure if the volume of the container increases?

  Pressure decreases if volume increases
• Why does a sharp knife cut more easily than a blunt knife?

  A sharp knife has a reduced surface area
• How does pressure relate to force and area when using a sharp knife?

  Smaller area increases pressure for same force