Kenetic Energy

Question 1

Do stationary object have kinetic energy

Answer 1

No

Question 2

What is kinetic energy

Answer 2

The energy stored in moving objects

Question 3

Moving car energy changes

Answer 3

Chemical energy - in petrol

Kinetic energy- moving

Question 4

What are we doing when we stretch a spring

Answer 4

We are applying a force to change the length of the spring

Question 5

What is it called when you apply a force

Answer 5

Doing work

Question 6

What energy store does a spring have

Answer 6

Elastic potential energy

Question 7

What is the stretch of a spring called

Answer 7

Extension

Question 8

On a graph extension and force

Answer 8

Directly proportion

Question 9

Why is it no longer directly proportional

Answer 9

Too much weight has been added the spring has reached limit of proportionality

Question 10

Eq: elastic potential energy

Answer 10

J joules

Question 11

Eq: Spring constant

Answer 11

N/m

Question 12

Eq: Extension

Answer 12

M

Question 13

Eq: kinetic energy

Answer 13

J Joules

Question 14

Eq: Mass

Answer 14

Kg

Question 15

Eq: Speed

Answer 15

M/S

Question 16

The power output of the turbine is directly proportional to the kinetic energy of the air passing the blades each second. Describe the effect on the power output when the wind speed is halved 

Answer 16

Mass of air passing the turbine blades is halved which decreases kinetic energy by a factor of two. Decrease in the kinetic energy by a factor of four. So the kinetic energy decreases by a factor of eight.

Question 17

As the person moves down the zip wire her increase in kinetic energy is less than her decrease in gravitational potential energy why

Answer 17

Friction between pulley and zip wire causes thermal energy to be released to surroundings