Q2 Interim REVIEW

An elevator is being lifted up an elavator shaft at a constant speed by a steel cable, as shown in the figure. Frictional forces can be ignored. In this situation, forces on the elevator are such that:

• The upward force by the cable is greater than the downward force of gravity.

• The upward force by the cable is equal to the downward force of gravity.

• The upward force by the cable is smaller than the downward force of gravity.

• The upward force by the cable is greater than the sum of the downward force of gravity to the air.

Newton's First law of motion is sometimes called:

• The action reaction law

• The law of conservation of energy

• The law of inertia

• The law of Friction

Which vector arrow in the picture represents the gravitational force Earth exerts on the mass?

• A

• B

• C

• D

• E

The acceleration of an object is directly proportional to the:

• net force acting on it

• its position

• its mass

• its displacement

When is mometum conserved?

• When only nonlinear forces are present

• When more linear than nonlinear forces are present

• When internal forces exceed external forces

• When the net force on the system equals zero

The acceleration of an object is inversely proportional to :

• the net forces acting on it

• its position

• its displacement

• its mass

What pair of terms are vector quantities?

• force and mass

• momentum and acceleration

• distance and displacement

• speed and velocity

the graph shows the distance an object travelled over time. Which line segment represents the time interval during which the object was moving at a positive constant speed?

• W

• X

• Y

• Z

Which of the following are the two factors that determine speed?

• displacement and time

• displacement and velocity

• distance and time

• distance and velocity

Static Friction is:

• the resistance to motion that must be overcome in order for one surface to begin sliding against another surface

• the resistance to motion that occurs once a surface is in motion, sliding against another surface

• the value that shows the relationship between two objects and the normal reaction between the two objects.