Force and acceleration
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.
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?
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?
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?