Question

Answer the questions in the paper below

1. State the initial potential energy of the hammer.

2. In raising the hammer,the electric motor uses more energy than that stated in (b) (ii). State and explain 2 reasons why the motor uses more energy.

3. State one change to the equipment in figure 7.1 below that would cause the baseplate to move further into the ground each time the hammer falls

Answer 1

ai the law of conservation state that energy can neither be created nor destroyed but can be changed from one form to the other

aii. potential energy to electrical energy to kinetic energy to sound energy to heat energy

bi. kinetic energy=

`(1)/(2) m{v}^(2)`

where mass= 1500kg

velocity=8.0m/s

kinetic energy=?

`(1)/(2) * 1500 * 8`

750×8

6000j

kinetic energy=6000j

bii. potential energy=mass ×acceleration due to gravity ×height

potential energy=kinetic energy= 6000j

mass=1500kg

gravity=10N/kg

height=?

6000=1500×10×h

6000=15000h

`(6000)/(15000) = (15000h)/(15000)`

`h = (6000)/(15000)`

h=0.4m