Motion Test Version 1

Which two quantities may not be added together directly?

• two vectors

• three vectors

• two scalars

• a vector and a scalar

A velocity's magnitude may be changed without changing its direction by __.

• applying a force parallel to its direction

• applying a force perpendicular to its direction

• accelerating the object into uniform circular motion

• adding a perpendicular component to the velocity

Which of the following is a vector quantity?

• a distance of 25 km along highway 66

• a difference of $6\degree\ C$ between Point A and Point B

• an increase in a mass of 14 kg

• a velocity of 2 m/s to the left

Where are Newton's laws of motion valid?

• only when there are coordinate axes

• only when unbalanced forces are involved

• only in an inertial reference frame

• only at a constant temperature

What defines an inertial frame of reference?

• The frame itself accelerates

• Newton's first law of motion holds.

• It must have been attached to the moving object

• It must have x, y, and z coordinate axes.

Which of the following is not true about the force of friction?

• It opposes motion

• It acts between any two solid bodies that are in contact.

• It acts only on objects that are at rest.

• It can act on a solid body that is traveling through a liquid.

The average speed of an object is found by dividing the __ by the time of travel.

• Displacement

• Distance traveled

• Instantaneous speed

• Instantaneous velocity

What does the slope of a velocity-time graph reveal about an object’s motion?

• The object’s change in position over time

• The velocity of the object

• The acceleration of the object

• None of the above are revealed

What is Newton’s first law of motion?

• For every force there is an equal and opposite reaction force

• It a net force is applied to an object, the the object will accelerate

• An object will remain at rest or continue moving in a straight line with a constant speed unless acted on by an unbalanced force.

• The gravitational force between tow objects is proportional to their masses and inversely proportional to the distance between them.

The cart in the diagram is initially at rest. Suddenly, the forces shown by the arrows are exerted for several seconds on the cart and then removed. Assuming no other forces are acting on the cart, what will happen to it?

• It will move to the left but then stop moving when the forces are removed.

• It will move to the right but then stop moving when the forces are removed.

• It will move to the left and continue moving, even when the forces are removed.

• It will move to the right and continue moving, even when the forces are removed.