Question

- A truck starts from rest on a plane road. What
are the possible energy changes taking place
while the truck is in motion ?​

Answer 1

Answer:

Given data:

Mass of stone(m)=7000 kg

Distance(S)=400 meter

Time(t)=20 second

1) We have to find the acceleration of the truck

So from the equation of motion S=ut+

2

1

a×t

2

, whereu=0

S=

2

1

a×t

2

a=

t

2

2×S

=

20×20

2×400

=2

sec

2

m

2) Force acting on truck

So,from newton's 2

nd

law of motion

F

=ma=7000×2=14000N=14kN

Answer 2

Answer:

Possible energy changes when a truck starts on a plane road.

So, initially the truck was at rest. And since we are considering the road to be the reference plane , we can say: Both Potential And Kinetic Energy were zero.

Now, the truck started to move.

The energy supplied by the engine of the truck is used to raise the kinetic energy of the truck.

However, since the truck is still going on a non-inclined plane road, the potential energy will still be zero.

But, a part of the energy provided by the engine will be converted into heat energy due to friction between the tyres and the road.

\star⋆ Hope It Helps.