Beta1

26-03-2006, 10:36:33

Well, I need someone to test drive a problem I'm going to set my year 10 class tomorrow...

Using the formulas for kinetic energy (K.E. = ½ x mass x velocity^2) and

gravitational potential energy (G.P.E = mass x gravity field strength x height)

complete the following calculations

Gravity field strength is 10 N

1: How much gravitational potential energy does a 500kg

rollercoaster car have at after climbing 25 metres?

2: The rollercoaster car rolls down the track and drops 20 meters.

How much potential energy does it have now?

3: If there was no friction or air resistance and all the lost

potential energy has all been converted into kinetic energy how

fast is the rollercoaster car moving?

4: In fact the roller coaster car was travelling at 10m/s.

How much kinetic energy does the car have?

How much energy has been lost as friction and air resistance?

What form is this energy likely to be in?

Obviously its rather better laid out and has proper ^2 symbols etc. They have done the K.E. formula already and will do the G.P.E. stuff in the in the first part of the lesson, this is the harder question for the 2-3 bright ones in a middle set.

Using the formulas for kinetic energy (K.E. = ½ x mass x velocity^2) and

gravitational potential energy (G.P.E = mass x gravity field strength x height)

complete the following calculations

Gravity field strength is 10 N

1: How much gravitational potential energy does a 500kg

rollercoaster car have at after climbing 25 metres?

2: The rollercoaster car rolls down the track and drops 20 meters.

How much potential energy does it have now?

3: If there was no friction or air resistance and all the lost

potential energy has all been converted into kinetic energy how

fast is the rollercoaster car moving?

4: In fact the roller coaster car was travelling at 10m/s.

How much kinetic energy does the car have?

How much energy has been lost as friction and air resistance?

What form is this energy likely to be in?

Obviously its rather better laid out and has proper ^2 symbols etc. They have done the K.E. formula already and will do the G.P.E. stuff in the in the first part of the lesson, this is the harder question for the 2-3 bright ones in a middle set.