Practice Problems for Illinois Learners

Problems

1.)          A four kilogram object is moving across a frictionless surface with a constant velocity of 2 meters per second.  Determine the force necessary to                          maintain the state of motion.

2.)          A net force of 10 Newtons acts on a box which has a mass of 2 kg. What will be the acceleration of the box?

3.)          How much horizontal net force is required to accelerate a 1000 kg car at 2 m/s2?

4.)          If an unbalanced force of 600 newtons acts on a body to accelerate it at +15 m/s2, what is the mass of the body?

5.)          A body with a mass of 1 kg is accelerated by a force of 2 N.  What is the velocity of this body after 5 s of motion?


Solutions

1.)              0, it's moving at a constant velocity.

2.)              5m/s^2

3.)              2000N

4.)              F = ma
                  m=F/a
                  m = 600n/15 m/s2
                  m= 40 kg

5.)              v = 10 m/s