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Force and acceleration F=ma 

When an object changes speed (accelerates or decelerates),its shape or direction of motion, a force is acting on it. The formula for force is given below. F=mass(kg)
X acceleration(m/s/s) 

Example. A 300g
cart reaches a speed of 50m/s in 20 seconds from a standing start. What
is the magnitude of the force acting on it? Exercises(F =ma) 

We
can manipulate the formula (F =ma) to work out
the mass or the acceleration of the cart. Example. What is the acceleration
of a 2kg brick thrown with a force of 4 newtons? Exercises(a =f/m) Example. Jonathon has an engine
that can provide a force of 5.6 newtons. He wants to place the engine
on a cart so it accelerates at 3.5m/s/s. What should the combined mass
of the cart and engine be to achieve this acceleration? Exercises(m =f/a) 
