P1.3/1.4 - GPE and Work Done Flashcards
1
Q
Describe the changes of energy stores in a pendulum
A
- at first, it is held at its highest point with max GPE
- as it swings down and towards the centre its GPE store decrease and its KE store increases
- energy is slowly lost to the surrounding via thermal energy and air resistance
2
Q
Describe the energy transfers of a bungee jumper
A
- on the platform, max GPE
- when he jumps, this is converted into KE
- as the rope stretches to slow the bungee jumpers fall, KE is converted to elastic energy store of the rope
- some energy is dissipated through air resistance
- at the bottom, the rope recoils and the energy is converted back into ke and GPE
3
Q
State the independent variables of an experiment with a pendulum
A
- angle of the drop
- Mass of pendulum bob
- length of the rope
4
Q
Period of a pendulum
A
The time taken for the pendulum to make a full swing from a to b
5
Q
Energy transferred to an object is equal to …
A
The work done on it
6
Q
Works done depends on …
A
- The size of the force
- Distance moved
7
Q
Formula for work done
A
Work done = force applied x distance moved
8
Q
Displacement
A
Distance that an object has moved in a definite direction
- e.g 50m north
9
Q
GPE of and object increases when..
A
Work is done to overcome the gravitational force
10
Q
Formula for GPE
A
GPE = mass x gravitational field strength x height
11
Q
Equipment needed for bungee jumping practical
A
- mass holder and masses
- long rubber band
- metre ruler
- set square
- clamp stand
- g-clamp
- eye protections
12
Q
Method for bungee jumping practical
A
- set up equipment
- hold the masses at a fixed position near the pint the rubber band is hanging from
- record starting position
- release masses,
- measure lowest position of the bottom of the mass holder and highest position it rebounds to
