10.1 Work and energy

Question 1

What are 4 examples of energy stores?

Answer 1

» Kinetic store
» Thermal store
» Elastic store
» Gravitational potential store

Question 2

What are 3 ways energy can be transferred?

Answer 2

» Mechanically
» Radiation
» Electrically

Question 3

What are the units of energy?

Answer 3

» Joules

Question 4

What is one joule equal to?

Answer 4

» Energy needed to raise a 1N weight through a vertical height of 1m

Question 5

What is the principle of conservation of energy?

Answer 5

» Energy cannot be created or destroyed

Question 6

When is work done?

Answer 6

» When a force acts on it making it move

Question 7

What is the equation for work done?

Answer 7

» Work done = Force x distance

Question 8

What is the work done when the Force and the distance are perpendicular to one another?

Answer 8

» 0J

Question 9

What is one thing to keep note of when doing work done calculations?

Answer 9

» Remember the force has to be in the same direction as the distance
» If a force is at angle to the object, resolve the horizontal component : costtheta, and the vertical component:sintheta
» Then use which ever one is acting in the direction of the distance

Question 10

What does the area under a force distance time graph represent?

Answer 10

» Work done