Newton's Second Law of Motion Review

Newton's Second Law of Motion

By John Toje

Newton's 2nd Law of Motion

Law of Acceleration

Newton's 2nd Law

The Law of Acceleration. Newton's second law of motion states that the acceleration of an object equals the net force acting on the object divided by the object's mass.

Acceleration and Mass

If the same force is applied to two objects:

As the mass increases the acceleration decreases.

Objects with more mass accelerate less.

Objects with less mass accelerate more.

Multiple Choice

If both rocks are pushed with the same amount of force, which rock would accelerate more?

• The 400kg Rock because it weighs more.

• The 40kg rock because it weighs less.

The 40kg rock will accelerate more because it weighs less. Remember the less mass, the more inertia.

Multiple Choice

What is force?

• A push on an object

• A pull on an object

• A push or pull on an object

​Newton's Second Law

​Force = Mass x Acceleration (F=ma)

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Open Ended

Which object will accelerate more, the baseball or bowling ball? Explain your answer.

The baseball will accelerate more than the bowling ball because the baseball has less mass.

Multiple Choice

Which rock will accelerate the least?

• The Small Rock

• The Large Rock

The Large Rock accelerates the least because it has more mass than the small rock.

Multiple Choice

Which grocery basket will have the least acceleration, if both grocery baskets are pushed with the same amount of force?

• The one without groceries because it has more mass.

• The one with groceries because it has more mass.

• The one without groceries because it has the least mass.

• The one with groceries because it has least mass.

Multiple Choice

Both objects are pushed with the same amount of force, which object will accelerate more the car or the basket ball?

• The basketball will accelerate the the most because it has the less mass than the car.

• The basketball will accelerate the least because it has the more mass than the car.

• The car will accelerate the the most because it has the less mass than the car.

• The car will accelerate the least because it has the more mass than the basketball.

Multiple Choice

The larger the mass you have the _____ force you need to change its motion.

• more

• less

Multiple Choice

A force of 90N is applied to each cart below, which one will accelerate the fastest?

• Cart 1

• Cart 2

• Cart 3

• Cart 4

Multiple Choice

The child applies a force of 5N when she pushes the swing. Her dad applies a force of 25N when he pushes the swing. Which swing will accelerate more?

• The swing the Dad pushes.

• The swing the child pushes.

The swing the dad pushes will accelerate more because the dad applies a greater force to the swing.

Multiple Choice

What is Newton's 2nd Law?

• Every action has an equal and opposite reaction

• An object at rest stays at rest, an object in motion stays in motion.

• F = ma

• Friction

Multiple Choice

If the man pushes with an equal amount of force, which object will accelerate more?

• Car because it has more mass

• Lawnmower because it has less mass

• Car because it has less mass

• Lawnmower because it has more mass

Multiple Choice

Johnny throws a baseball with 75 N of force. Roger throws a baseball with 200 N of force. Which person's baseball will accelerate the least?

• Johnny's Baseball

• Roger's Baseball

Johnny's baseball will accelerate the least because Johnny used 75N of force. Johnny used less force than Roger.

Multiple Choice

If you increase the mass on an object, its acceleration

• decreases

• stays the same

• also increases

• stops

Multiple Choice

Football A has a greater mass than football B. Which football will have greater acceleration when both are thrown with the same force in the same direction?

• Football A

• Football B

• They will have the same acceleration

• Mass has no effect on acceleration

Multiple Choice

Joshua and Elijah are playing cars. Joshua pushed his car with 12N of force towards the finish line. Elijah pushed his car with 20N of force towards the finish line. Who's car made it to the finish line first?

• Joshua's car made it to the finish line first because he applied more force so it accelerated more.

• Joshua's car made it to the finish line first because he applied less force so it accelerated more.

• Elijah's car made it to the finish line first because he applied more force so it accelerated more.

• Elijah's car made it to the finish line first because he applied more less so it accelerated more.

Multiple Choice

A greater applied force is required to move an object with a greater mass than one with a smaller mass.

• True

• False

Newton's 2nd Law of Motion

• Law of Acceleration

• There is an equation.

• F=MA

• Study the Triangle

Multiple Choice

If a 2kg bird is pushed by the wind with a force of 2N, how fast does the bird accelerate?

• 1 m

• 2 m/s²

• 4m/s²

• 1 m/s²

Multiple Select

According to the formula(f=mxa), and the triangle. What 2 variables are needed to calculate the mass?

Remember Mass=Force/Acceleration

• Mass

• Acceleration

• Force

• Speed

Multiple Choice

How much force is needed to accelerate a 25kg bowling ball at 2m/s². 

• 50N

• 5N

• 12.5N

• 100N

Multiple Choice

How much force is needed to accelerate a 3kg skateboard at 5m/s^2. 

• 8N

• 1.6N

• 0.6N

• 15N