Exit Check 2.3 - 2nd Law

2.3.1

Which of the following best describes how Newton's second law predicts what will happen to the acceleration of an object when the mass of an object increases?

• If the mass increases the object will accelerate more.

• If the mass increases the object's acceleration will not change.

• The acceleration should decrease when the mass increases

• If the mass increases, the force increases as well.

Answer explanation

In our lesson, we used the terms directly proportional and inversely proportional.

When two quantities are directly proportional, increasing one increases the other.

When they are inversely proportional, increasing one decreases the other.

Use your notes to figure out which type of relationship the question is asking about to choose the correct outcome.

Tags

HS-PS2-A-1

2.3.1

Which of the following best describes how Newton's second law predicts what will happen to the acceleration of an object when the net force acting on object increases?

• If the net force increases the object will accelerate more.

• If the net force increases the object's acceleration will not change.

• The acceleration should decrease when the net force increases

• If the mass increases, the net force increases as well.

Answer explanation

In our lesson, we used the terms directly proportional and inversely proportional.

When two quantities are directly proportional, increasing one increases the other.

When they are inversely proportional, increasing one decreases the other.

Use your notes to figure out which type of relationship the question is asking about to choose the correct outcome.

Tags

HS-PS2-A-1

2.3.1

In order for the acceleration of an object to decrease which of the following must happen (select both correct options).

• The net force acting on the object increases.

• The net force acting on the object decreases.

• The mass of the object increases (mass is added to the object).

• The mass of the object decreases (mass is removed from the object).

Answer explanation

In our lesson, we used the terms directly proportional and inversely proportional.

When two quantities are directly proportional, increasing one increases the other.

When they are inversely proportional, increasing one decreases the other.

Use your notes to figure out which type of relationship the question is asking about to choose the correct outcome.

Tags

HS-PS2-A-1

2.3.1

Which of the following mathematically describe Newton's Second Law? There can be more than one correct option.

Answer explanation

In our lesson, we used the terms directly proportional and inversely proportional.

When two quantities are directly proportional, increasing one increases the other.

When they are inversely proportional, increasing one decreases the other.

Use your notes to figure out which type of relationship the question is asking about to choose the correct outcome.

Tags

HS-PS2-A-1

2.3.2

If the net force acting on an object is multiplied by 3, and the mass of the object stays the same, what happens to the acceleration of the object?

• The acceleration stays the same because the mass stayed the same

• The acceleration is multiplied by 3

• The acceleration increases by 3 because of addition

• The acceleration is divided by 3

Tags

HS-PS2-A-1

2.3.2

If stuff is added to increase an object's mass to three times what it was before, but the net force used to accelerate the object stays the same, what happens to the acceleration of the object?

• The acceleration stays the same because the net force the same

• The acceleration is multiplied by 3

• The acceleration is divided by 3

Tags

HS-PS2-A-1

2.3.2

If an object's mass is tripled, predict the change in force needed to keep its acceleration the same.

• The force will not need to change because the acceleration has not changed.

• The force will need to be 3 times as big.

• The force will need to be 1/3 as big.

• The force will need to be 9 times as big.

Tags

NGSS.MS-PS2-2

2.3.3

An 5kg object is being pushed with a net force of 10N. Which of the following shows the correct resulting acceleration?

Answer explanation

If you’re having trouble, grab scratch paper and use the KUF method: identify the two Known values and the one Unknown. Use the Unit 2 triangle on your yellow reference sheet and follow the instructions on the back to choose the correct formula. Plug in your values, solve carefully, and select the correct answer.

On challenging questions make sure you are solving for the net force first, before finding the mass or acceleration.

Tags

HS-PS2-A-1

• 9.0 kg

• 4.0 kg

• 0.25 kg

• 4.5 kg

Answer explanation

If you’re having trouble, grab scratch paper and use the KUF method: identify the two Known values and the one Unknown. Use the Unit 2 triangle on your yellow reference sheet and follow the instructions on the back to choose the correct formula. Plug in your values, solve carefully, and select the correct answer.

On challenging questions make sure you are solving for the net force first, before finding the mass or acceleration.

Tags

HS-PS2-A-1

• 10.3 N

• 6.9 N

• 0.14 N

• 11.7 N

Answer explanation

If you’re having trouble, grab scratch paper and use the KUF method: identify the two Known values and the one Unknown. Use the Unit 2 triangle on your yellow reference sheet and follow the instructions on the back to choose the correct formula. Plug in your values, solve carefully, and select the correct answer.

On challenging questions make sure you are solving for the net force first, before finding the mass or acceleration.

Tags

HS-PS2-A-1