Force and Motion STAAR Review

As they were investigating potential and kinetic energy, students dropped a marble into a tray of flour and recorded data. What was the question of the experiment? (6.8A)

• What will a marble do when it is dropped into a powdery substance?

• When an object has more potential energy, will it transform into more kinetic energy?

• Will the mass of an object affect the force of kinetic energy?

• Does a falling object have kinetic energy?

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-2

NGSS.MS-PS3-4

NGSS.MS-PS3-5

At which point on the roller coaster does the car have the most kinetic energy? (6.8A)

• W

• X

• Y

• Z

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

At which point on the rollercoaster does the car have most potential energy? (6.8A)

• W

• X

• Y

• Z

Tags

NGSS.MS-PS3-2

Javelinas need strong leg muscles to help provide enough force for them to accelerate to high speeds. This fast movement can help Javelinas escape from predators and reach the safety of the pack. If a javelina runs 42 meters in 6 seconds, what is its average speed? (6.8C)

• 6 m/s

• 7 m/s

• 48 m/s

• 252 m/s

A steel ball is at one end of the box that is moving forward as shown. The box suddenly stops. According to ​ (a)   , the steel ball keeps rolling AFTER the box stops because of inertia. The ball continues rolling forward at the SAME speed.

• Newton's 1st Law

• Newton's 2nd Law

• Newton's 3rd Law

During a demonstration of Newton's laws of motion, a student used the setup shown in Figure 1. The student flicked the index card with a fingertip, and the coin fell straight down into the plastic cup as shown in Figure 2. Which of these best explains why the coin fell straight down into the cup instead of remaining on the index card?

• The coin was at rest until the card was removed, so it stayed in the same location. Once the card was gone, the unbalanced force of gravity caused the coin to fall.

• Moving the card applied an action force on the coin. Since the card was gone, gravity applied a reaction force on the coin.

• The card had less mass than the coin, so a smaller force of gravity acted on the card. The larger force of gravity on the coin made it fall.

• The acceleration of the coin falling into the cup was equal and opposite to the acceleration of the card.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

NGSS.MS-PS2-4

A student inflates a balloon attached to a plastic straw. A string is threaded through the straw and tied to opposite ends of the room. When the air in the balloon is released, the balloon travels the length of the string. Which of Newton's laws explain this?

• The law of action-reaction

• Newton's law of magnetism

• The law of force and acceleration

• The law of gravity

Tags

NGSS.MS-PS2-1

According to Newton's 2nd Law, the acceleration of an object depends on the net ​ (a)   acting upon the object and the ​ (b)   (or amount of matter) the object has.​

• force

• mass

• density

• speed

• length

• gravity

Tags

NGSS.MS-PS2-2

According to Newton's 3rd Law, forces occur in ​ (a)   . The ​ (b)   force is the fuel burning and shooting down, while the ​ (c)   force is the rocket moving upward with an ​ (d)   and opposite force.

• pairs

• action

• reaction

• equal

• friction

• gravity

• air resistance

Tags

8.6C

112.20.b.6.C

According to Newton's 1st Law, an object in motion will ​ (a)   , and an object at ​rest will remain at rest, UNLESS an ​ (b)   force acts upon it to change its velocity.

• remain in motion

• unbalanced

• balanced

• slow down

• speed up

Tags

8.6C

112.20.b.6.C