5. What force are people using when they put sand or gravel on icy roads in the winter?

6. What type of friction must you overcome when you

ice skate?

7. What force keeps a roller-coaster car on the track?

8. When you wear a seat belt, you are being protected

from possible harm by what force?

9. What has greater inertia, a large car or a small car

moving at the same speed? Why?

10. If someone is playing in a baseball game, what

are three forces or laws of motion that could affect the game?

the independent variable, or the one that is intentionally manipulated is the speed.

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

magnets not strong enough

explanation: