Plz give a example of acceleration is against the direction of motion? ?

Acceleration is in the direction of motion, when you are increasing the speed of the car moving along a straight line. ... Acceleration is against the direction of motion, when brakes are applied to the car in motion.

UR ANSWER

if one throws a ball straight up into the air the acceleration of the ball when it is moving upward is against the direction of the ball. The acceleration due to gravity is always pointing down.

when brakes are applied

when some one tries to stop the moving bicyle

Explanation:

When we throw a ball upwards then the acceleration is against the motion.

the rifle give a backward kich on firing a bullet

newton's law of motion (theory) : class 9 : physics 1.a gun recoils when a bullet is fired from it: when a bullet is fired from a gun, the gun exerts a force on the bullet in the forward direction. is the action force. the bullet also exerts an equal force on the gun in the backward direction. the backward movement of the gun is called the recoil of the gun.

mass of the engine = 8000 kg 

mass of each wagon = 2000 kg, 

np. of wagons = 5 

total mass of train = 8000+2000×5= 18000 kg 

force, f = 4 n 

track resistance , r = 5000 n 

total accelerating force = f −r =4−5000=35000 n 

let acceleration = x m/s² 

acceleration , = accelerating force / mass 

x=35000/18000= 35/18=1.94 m/s² 

frictional resistance of 4 wagons = 5000×(2000×4)/18000 = .22 n 

accelerating force on 4 wagons =2000×4×1.944 =15552 n 

hence total force exertred by wagon on wagon 2= accelerating force +frictional resistance 

= .22 +15552=17774.22 n 

total force required to produce acceleration

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