Newton's Second Law is concerned with unbalanced forces. Unbalanced forces produce acceleration. The greater the unbalanced force the greater the acceleration. This law is usually written as an equation:
Where unbalanced force is measured in Newtons ( ), mass in kilograms ( ) and acceleration in metres per second per second ( )
Remember that it is an unbalanced force that is required here.
A car's engine force is 3000 and its mass is 1500 .
A frictional force of 500 acts over a distance of 20 .
Calculate the acceleration of the car.
The acceleration of the car is 1.67 .
Calculate the work done in moving the car against friction.
Work done against friction moving car = 1000 .