SCIENCE EXAM Multiple Choice – Flashcards

What is a force and what are the units that we measure force with?

The _________________ is the combination of all forces acting on an object. a) direction of motion b) force pair c) inertia d) net force (resultant force)

4) Forces that cancel each other out are called _________________ forces. a) neutral b) balanced c) inactivated d) null

5) When balanced forces act on an object, the net force is ___________. a) positive b) zero c) negative d) increased due to friction

6) When unbalanced forces act on an object, _____________ a) the object accelerates. b) the net force is zero. c) the object speeds up. d) friction becomes greater than the net force.

7) _________________ is a force that resists motion between two surfaces that are in contact. a) resistance b) friction c) inertia d) acceleration

8) _________________ measures an object's tendency to resist changing its motion. a) gravity b) acceleration c) mass d) inertia

9) An example of a balanced force is: a) a car sliding on ice b) a tug of war game in which no one wins c) a car hitting a telephone pole d) a roller coaster going down the first drop.

10) An example of an unbalanced force (net force) is a) a car parked in the garage. b) a tug-of-war game in which no one wins. c) a bridge. d) a roller coaster going down the first drop.

B. Newton's Laws of Motion 12) Pick the best example of Newton's First Law in action. a) A rocket taking off from earth which pushes gases in one direction and the rocket in the other. b) A rocket sitting on the ground preparing for take off but it needs an outside force to overcome its inertia of a non-moving object. c) A rocket that is accelerating through space and exerts a great amount of force because its mass and acceleration is so large. d) Both b and c.

13) Which one of the following determines the inertia of an object? a) friction b) mass c) force d) momentum