8.PS2.4 Newton's 2nd Law of Motion

A toy car with a mass of 1Kg is pushed by a child with a force of 10N.

What is the acceleration of the car as a result of this push?

• 10 m/s/s

• 1 m/s/s

• 10 m/s

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NGSS.MS-PS2-2

A F-16 fighter jet with a mass of 4000 Kg accelerates at 75 m/s/s.

What is the magnitude of force from the the jet’s engines needed to achieve this acceleration?

• 30,000 N

• 30 N

• 300,000 N

Tags

NGSS.HS-PS2-1

A small car and big truck are driving down a two-lane highway on a rainy day. The car is in the left lane, and the truck is in the right lane. Both vehicles are traveling North at the same speed (70 MPH). Both drivers see a traffic jam up ahead, and they both slam on theirs brakes with all of their might at the same moment. The car comes to a halt after traveling 30 feet. The truck, however, does not halt until 120 feet.

Why does it take the truck longer to come to a complete stop even though both vehicles were moving at the same speed?

• The mass of the truck is much greater than the mass of the car.

• The mass of the car is much greater than the mass of the truck.

• Because both cars were maintaining the same constant velocity.

Tags

NGSS.MS-PS2-2

Newton’s 2nd Law of Motion states that force is equal to the mass times the acceleration.

If the force acting on the object stays the same but the mass increases, what is most likely to happen to the acceleration of the object?

• Velocity will change but the speed and direction will remain constant.

• Acceleration will increase.

• Acceleration will decrease.

Tags

NGSS.MS-PS2-2

A 50 kg boy on a skateboard experiences a 75 N force as shown.

What is the acceleration of this boy?

• 1.50 m/s²

• 0.67 m/s²

• 25.00 m/s²

Tags

NGSS.MS-PS2-2

The acceleration due to gravity on Earth is 9.8 m/s². The force acting on an object on Earth is 16 Newtons.

What is the mass of this object on Earth?

• Mass of the object is 2.6 kilograms

• Mass of the object is 1.63 kilograms

• The mass is .6125 kilograms

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NGSS.HS-PS2-1

An object is falling with an acceleration of 9.8 m/s/s with a force of 90 N.What is the mass of this object?

• 9.2 Kg

• 0.11 Kg

• 92 Kg

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

A force of 5N is required to increase the speed of a box from a rate of 1.0 m/s to 3.0 m/s within five seconds along a level surface.

What change would most likely require additional force to produce the same results?

• If friction was increased between the box and surface it would require less force

• If friction was reduced between the box and surface it would require more force.

• If the mass of the box was increased it would require more force.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

A car moves forward with an acceleration of 8.0 m/s/s after a force of 800 N pushes the car.

What is the mass of the car under these circumstances?

• 100 Kg

• 800 Kg

• 80 Kg

Tags

NGSS.HS-PS2-1

On Earth an astronaut weighs 980 Newtons (about 220 pounds) and has a mass of 100 kilograms. On the Moon, the same astronaut weighs 162.2 Newtons (about 37 pounds).

(Select 2 of 5 Answers)

What is the mass of this astronaut on the Moon, and what is the acceleration acting on the astronaut’s body when she is standing on the Earth?

• Acceleration on Earth: 1.6 m/s/s

• Mass on the Moon: 100 kilograms

• Acceleration on Earth: 9.8 m/s/s

• Mass on the Moon: 37 kilograms

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4