To find force you multiply mass by accelerations; if i have a 5.0 gram matchbox car accelerating at 7.0 m/sec2 how many newtons (n) of force will it hit the wall with?

The answer to your question is:  F = 0.035 N

Explanation:

Data

mass = 5 gram

acceleration = 7 m/s²

Force = ?

Formula

               F = ma

Process

Convert mass

                                1000 g 1 kg

                                      5 g     x

                                x = (5 x 1) / 1000

                                x = 0.005 kg

              F = (0.005)(7)

              F = 0.035 N                

You don't understand.

If you WANT the little car to accelerate at 7 m/s^2, then YOU have to push it with (0.005 kg)x(7m/s^2) = 0.035 Newton of force. If you ever stop pushing, the car will stop accelerating.

Does it hit a wall ? Well then, the average force it hits the wall with is

(the car's speed when it hits) times (0.005) divided by (the length of time the hit lasts) .