8.6C Newton's 2nd Law of Motion - F=ma

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

• Cart 1
• Cart 2
• Cart 3 
• Cart 4

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NGSS.MS-PS2-2

A jogger is jogging on the sidewalk while pushing against the ground with a force of 400 N. Wind is pushing back against the jogger with a force of 50 N. The mass of the jogger is 60 kg. What is the jogger’s acceleration?

• 21,000 m/s²

• 7.50 m/s²

• 5.83 m/s²

• 27,000 m/s²

Tags

NGSS.MS-PS2-2

An unbalanced force of 50 N is acting on a 10.0 kg object. Based on the information shown in the diagram, complete the following sentence: As long as the force acts on the object, the object will continue to move toward the west, and its velocity will increase by _______ m/s every second. (provide only the whole number as your answer)  

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

A physics student has 5 wheelbarrows, each with a different mass. Placing each of them on a flat, smooth ramp the student uses a spring driven plunger to push each wheelbarrow with a constant force. They then measure the amount of time it takes each wheelbarrow to reach the end of the ramp. The student adjusts the amount of force used each time until each of the wheelbarrows reach the end of the ramp with the same time. This means that each wheelbarrow will have approximately the same initial acceleration. Which of the graphs below could represent the amount of force needed to push the different carts so they get the same acceleration?

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• 
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NGSS.MS-PS2-2

The masses of four vehicles and the net forces acting on them as they enter a highway are recorded in the table below. Which vehicle has the greatest acceleration as it enters the highway?

• Sedan
• Coupe
• SUV
• Truck

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NGSS.MS-PS2-2

A student lets a toy car roll four times down a ramp that is 1 m long. Each time the student covers the surface of the ramp with a different material. The student measures the time it takes the car to roll down the ramp and records the results in the table below. Which of these would be the best conclusion based on the data in the table?

• Different surfaces affect how fast a toy car accelerates.
• Different toy cars travel at different speeds.
• Gravity has little effect on the speed of toy cars on different surfaces.
• Air resistance is the greatest factor in limiting the acceleration of different toy cars.

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

A bowling ball is rolled with a certain speed and strikes a bowling pin with a force indicated by the arrow in this illustration. When the bowling ball strikes the bowling pin, the force applied by the pin to the ball -

• depends on the mass of the bowling pin.
• is equal to the force applied by the ball.
• must be zero, since the pin is not moving.
• is equal to the force of gravity on both.

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NGSS.MS-PS2-1

Two cars with different masses travel at the same speed down a hill toward a stop sign. What will happen when both cars apply brakes at the same time to stop?

• The car with the smaller mass will require less forces to stop than the car with the larger mass.
• The car with the larger mass will amintain its velocity while traveling down the hill.
• The car with the smaller mass will take longer to stop than the car with the larger mass.
• The car with the larger mass will have less inertia than the car with the smaller mass.

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NGSS.MS-PS2-2

If a 10 kilogram object accelerates suddenly at 15 m/s^2, how much force was applied to the object?

• 150 Newtons
• 15 Newtons
• 150 kilograms
• 100 kilograms

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NGSS.MS-PS2-2

If a force of 50 Newton's was applied to an object with a mass of 500 grams, what will the object's acceleration be?

• 10 m/s²

• .1 m/s²

• 100 m/s²

• 1 m/s²

Tags

NGSS.MS-PS2-2