2006-08-07 22:08:07 · 6 answers · asked by joy_blue03 1 in Science & Mathematics ➔ Physics
KE = 0.5mv²
The kinetic energy is dependent on both mass and velocity. So something travelling at a slow speed can have a larger kinetic energy if it had a much larger mass than a body travelling fast.
2006-08-07 22:51:20 · answer #1 · answered by dennis_d_wurm 4 · 1⤊ 0⤋
There sure are some confused people out there.
Ke = .5*m*v²
is the expression for the Kinetic energy (in Joules) of an object having mass m and velocity v.
Put in some numbers. Lets say a 10 kg mass at 100 m/s
Ke = .5*10*100² = 50,000 Joules
Now, an 80 kg mass moving at 50 m/s
Ke = .5*80*50² = 100,000 Joules
If the masses are the same then, yes, the slower one will have less kinetic energy, but you can't say anything about kinetic energy based on velocity alone.
Doug
2006-08-08 05:39:01 · answer #2 · answered by doug_donaghue 7 · 1⤊ 0⤋
The slower moving object has a greater mass than the faster moving object and therefore takes more kinetic energy to move it.
2006-08-08 05:18:48 · answer #3 · answered by sukditup 3 · 0⤊ 0⤋
Because kinetic energy is dependent on velocity AND mass. A 1 tonne elephant walking at 1mph has more kinetic energy than a cat walking at 5mph !!!!
2006-08-08 05:12:02 · answer #4 · answered by Rob 2 · 0⤊ 0⤋
kinetic energy depnds on speed . the more the speed, the greater the energy. a fast moving object has higher energy.
2006-08-08 05:18:12 · answer #5 · answered by eshaghi_2006 3 · 0⤊ 0⤋
because the faster object has more potential energy?
2006-08-08 05:12:30 · answer #6 · answered by Holymasteric 3 · 0⤊ 0⤋