8th grade Semester 2 Exam

Which quantity must equal zero if a car is moving at a constant rate along a straight line?

• speed of the car

• direction of the car

• energy of the car

• acceleration of the car

Which example best illustrates a non-contact force?

• An apple falling

• Lifting a box

• Pulling a nail out of wood

• A car moving along a flat surface

Light waves that cross from an air medium to a water medium will

• be focused into a straight line.

• lose energy and dissipate.

• change length and direction.

• reflect off the water’s surface.

What happens to a ray of white light when it passes through a prism?

• The ray of light is combined into a single color.

• The ray of light is completely absorbed by the prism.

• The ray of light is bent backward toward the source of light.

• The ray of light is bent in several pathways showing a rainbow.

The arrows indicate the direction a 40-mile-per-hour wind is blowing. Which shows the wind direction that would slow a moving car the MOST?

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In gym class a student kicks a soccer ball high into the air. As the ball goes upward, which type of energy is increasing?

• kinetic energy

• thermal energy

• potential energy

• mechanical energy

For the wave shown, the vertical distance, red line, is the

• amplitude.

• frequency.

• period.

• wavelength.

Which has only potential energy?

• A ball sitting on a shelf

• A ball moving through the air

• A ball thrown upward

• A ball rolling down the hill

A student walking quickly while carrying an orange on his lunch tray stops suddenly. The orange will MOST likely roll off the tray due to

• inertia of the orange.

• centripetal force of the orange.

• the friction acting on the orange.

• the balanced forces acting on the orange.

The motion of a toy car is shown in the graph below.

In which section of the graph is the car moving away from its starting point?

• W

• X

• Y

• Z