CBA 3 on level Corrections

1.

A basketball with a mass of 0.60 kg is accelerated with a force of 10.8 N.  If resisting forces are ignored, what is the acceleration of the basketball to the nearest m/s²?

Mathematical Equivalence

ON

Tags

NGSS.MS-PS2-2

2.

The diagram below shows two different forces acting on a cyclist riding a bicycle.

The total mass of the cyclist and the bicycle is 100.0 kg.  Based on this information, what is the acceleration of the cyclist?

• 0.66 m/s² backward, because the force of the air slows the cyclist down

• 0.66 m/s² forward, because the applied force is greater than the force of the air

• 2.3 m/s² backward, because the forces are opposite and not equal

• 2.3 m/s² forward, because the cyclist's inertia is greater than the force of the air

Tags

NGSS.MS-PS2-2

3.

 

Four students raced toy cars on a track.  The mass and the acceleration of each car is recorded in the table below.

 

Which toy car had the greatest applied force? 

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS2-2

4.

Two students are working together to build a birdhouse.  Student 1 applies a force of 10 N to a wooden board in order to slide it across the table to Student 2.



If the force of friction resisting the student's push is 4 N, what is the net force acting on the board?
 

• 4N

• 6N

• 10N

• 14N

Tags

NGSS.MS-PS2-2

5.

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 a 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 tended to remain 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-PS2-4

6.

The diagram below shows a hot air balloon rising.  Propane gas tanks are seen at the bottom of the balloon.

What energy transformations occur when propane gas is used to lift the balloon?

• Mechanical --> light --> chemical

• Chemical --> mechanical --> thermal

• Thermal --> mechanical --> light

• Chemical --> thermal --> mechanical 

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

7.

A student drew the diagram below to show the movement of water through a hydroelectric dam.


The student used the diagram to describe changes in the potential and kinetic energy of the water. At which location is the gravitational potential energy of the water the greatest?

• Location W

• Location X

• Location Y

• Location Z

Tags

NGSS.MS-PS3-2

8.

Deep Space 1 was a spacecraft powered by an engine that gave off xenon particles to change velocity. It had a mass of 500 kg. Which expression can be used to find the spacecraft’s acceleration if its engine created a net force of 0.10 N? 

• 
• 
• 
• 

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

9.

Describe the forces involved in tossing a coin and how they apply to Newton's 1st law of motion.

10.

A mother and daughter press their hands together and then push apart while ice skating.

  

Immediately after they push away from each other, how does the motion of the mother and daughter change

• The mother moves forward, and the daughter moves backward with a greater acceleration.

• Both move forward, but the mother moves with a greater acceleration.

• The mother moves backward, and the daughter moves forward with a greater acceleration.

• Both move backward, but the daughter moves with a greater acceleration.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2