Day 4. Lesson. STAAR® Blitz. Science. 8th Grade

Multiple Choice

Pick the correct statement about forces and motion.

• For an object to move at a constant speed or accelerating it must have unbalanced forces.

• Objects moving at a constant speed have unbalanced forces while objects that are accelerating have balanced forces.

• Objects moving at a constant speed have balanced forces while objects that are accelerating have unbalanced forces.

• For an object to move at a constant speed or accelerating it must have balanced forces.

Multiple Choice

What is the net force?

• 30 N left
• 25 N right
• 5 N left
• 55 N right

Multiple Choice

What is true about this picture?

• the forces are balanced

• the net force is 10N

• The net force is 3 N

• The net force is 7N

Multiple Choice

What is happening between 2 and 3 seconds?

• The object is not moving.

• The object is not accelerating.

• The object is slowing down.

• The object is speeding up.

Multiple Choice

During which segment did the car come to a complete stop?

• Segment A to B

• Segment B to C

• Segment C to D

• Segment D to E

Multiple Choice

At which point of the roller coaster is potential energy the greatest?

• W

• X

• Y

• Z

Multiple Choice

2. The diagram to the right represents a diver’s motion from the top of a high diving board into a pool of water. At what point does the diver have the greatest kinetic energy and the least potential energy?

• 1
• 2
• 3
• 4

Multiple Choice

A lamp that plugs into a wall socket draws energy, which flows through a thin wire in the bulb, causing it to heat up until it glows. What energy transformations are taking place?

• Chemical → light → electrical

• Mechanical → sound → light

• Thermal → solar → electrical

• Electrical → thermal → light

Categorize

Options (16)

Battery

Gasoline

Driving a car

Riding a bicycle

Sharpening a pencil

Stretched Rubber Band

Turning on a lightbulb

The Sun

driving a car

battery

stretched rubber band

turning on a lightbulb

riding a bicycle

sharpening a pencil

gasoline

the Sun

Organize these options into the right categories

Mechanical Energy

Chemical Energy

Elastic Potential Energy

Light Energy

Multiple Choice

When a lion eats a zebra and then uses the energy from the zebra to run, the lion's body converts =-

• chemical energy to mechanical energy

• electrical energy to chemical energy

• chemical energy to light energy

• mechanical energy to chemical energy