A truck and a car are both moving with a contant velocity of magnitude 'v'. Why is it difficult to change the motion of a truck when compared to the state of the motion in a car.
I'll give 10 points for the best answer.
It's easy. I'll give you a hint: The car has less mass
2007-08-13 01:46:45 · 5 answers · asked by that's me™ 1 in Science & Mathematics ➔ Physics
The law of conservation of momentum. Since the truck is heavier, it is more difficult to slow down compared to a lighter car at the same speed.
Momentum = mv
M(truck) = m1v
M(car) = m2v
m1 > m2
So, M(truck) > M(car)
2007-08-13 01:51:29 · answer #1 · answered by yeeeehaw 5 · 0⤊ 0⤋
By Newton's second law the rate of change of momentum is directly proportional to the impressed force acting on a body.
Change in momentum is mass x change in velocity.
Force is equal to the mass x rate of change in velocity or force is equal to the mass x acceleration.
For a constant acceleration, the force needed is proportional to the mass of the body.
Greater the mass larger is the force needed for a fixed acceleration.
Hence the truck needs a greater force than the car to produce the same acceleration.
2007-08-13 14:20:58 · answer #2 · answered by Pearlsawme 7 · 0⤊ 0⤋
In a word: momentum. The truck is likely more massive than the car and the momentum (or inertia) is equal to the mass * velocity.
This is given by Newton's First Law: "An object at rest will remain at rest unless acted upon by an external and unbalanced force. An object in motion will remain in motion unless acted upon by an external and unbalanced force."
2007-08-13 08:53:46 · answer #3 · answered by gebobs 6 · 0⤊ 0⤋
The truck has more mass so it is harder to change the motion
2007-08-13 08:51:15 · answer #4 · answered by Anonymous · 0⤊ 0⤋
A truck has more mass and it takes more energy to get more mass moving.
2007-08-13 08:51:17 · answer #5 · answered by huithuithuithuithuit 2 · 0⤊ 0⤋