Work and energy

• What does the study of work and energy include?

  GPE, KE, and elastic energy
• What is work defined as in physics?

  Work is done when a force acts on a moving body
• What happens to energy when work is done?

  Energy is transferred from one place to another
• What is the total amount of energy when work is done?

  The total amount of energy remains constant
• What is the formula for calculating work done?

  Work done = Force × Distance
• If a force of 10 N moves an object 2 m, what is the work done?

  20 J
• What units are used to measure work done?

  Joules
• Why do work and energy have the same units?

  Because energy is the ability to do work
• What is the relationship between work done and energy transferred?

  Work done is equal to energy transferred
• What types of energy can an object possess?

  Potential, kinetic, and elastic energy
• What are the key concepts related to work and energy?

  • Work is done when a force acts on a body
  • Energy is transferred when work is done
  • Total energy remains constant
  • Work done = Force × Distance
  • Units of work and energy are joules
• What are the different forms of energy an object can have?

  • Gravitational potential energy (GPE)
  • Kinetic energy (KE)
  • Elastic energy
• What does GPE stand for in physics?

  Gravitational potential energy
• What factors determine the gravitational potential energy of an object on Earth?

  Mass and height above the ground
• If an object is lifted, what happens to its energy?

  It gains gravitational potential energy
• What is the formula for calculating gravitational potential energy?

  $\text{GPE} =$$m \times g \times h$
• In the GPE formula, what does 'm' represent?

  Mass in kilograms (kg)
• In the GPE formula, what does 'g' represent?

  Gravitational field strength in N/kg
• In the GPE formula, what does 'h' represent?

  Change in height in metres (m)
• How much gravitational potential energy does a 0.25 kg book gain when lifted 2 m?

  5 J
• What is the calculation for GPE when mass is 0.25 kg, height is 2 m, and g is 10 N/kg?

  GPE = 0.25 × 10 × 2
• What happens when work is done against gravitational force?

  The object gains energy
• What are the key concepts related to work and energy in physics?

  • Gravitational potential energy (GPE)
  • Kinetic energy (KE)
  • Energy conservation
  • Force and extension relationships
  • Car safety features in energy absorption
• What does kinetic energy depend on?

  Mass and speed of the object
• What is kinetic energy?

  Energy possessed by an object in motion
• How do you calculate kinetic energy?

  $\text{KE}=$$\frac{1}{2}{\text{mv}^{2}}$
• What happens to elastic potential energy when an elastic object is stretched?

  It stores elastic potential energy
• What is the formula for kinetic energy in joules?

  KE in joules (J)
• What is the kinetic energy of a 1,000 kg car travelling at 5 m/s?

  12,500 J
• What is elastic potential energy and how is it stored?

  • Energy stored in elastic objects
  • Stored when stretched or squashed
  • Example: Catapult or squash ball
• What is the relationship between force and extension in elastic objects?

  Force causes shape changes in elastic objects
• What is work done on an elastic object?

  Work done changes its shape and stores energy
• What is the unit of mass in the kinetic energy formula?

  Kilograms (kg)
• What is the unit of speed in the kinetic energy formula?

  Metres per second (m/s)
• What does the equation $\text{KE}=$$\frac{1}{2}{\text{mv}^{2}}$ represent?


  It calculates kinetic energy of an object
• How does energy conservation relate to kinetic energy and elastic potential energy?

  Energy is conserved in transformations between them
• What does the study of work and energy include?

  GPE, KE, and elastic energy
• What is the relationship between force and extension in elastic objects?

  Extension is directly proportional to force applied
• What is Hooke's Law?

  F = k × x
• What does the variable F represent in Hooke's Law?

  Force in newtons (N)