8.7 A Review

When a ball is tossed in the air, it travels upward, gradually slows down, momentarily reaches zero speed, then moves back downward with increasing speed. Which statements best explain the change in the ball’s motion? Select 2 correct answers.

• A) The force of gravity causes the ball to change its direction.

• B) The force of friction causes the ball to stop.

• C) The force of gravity causes the ball to change its velocity.

• D) The ball remains in its state of upward motion.

• E) The action-reaction force pair of gravity and the push force cancel each other.

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When this happens, how what will be the result of Cart A?

• A) Cart A will have the same acceleration after the application of the force.

• B) Cart A will have a change in speed after the application of the force.

• C) Cart A will have a change in direction after the application of the force.

• D) Cart A will have the same position after the application of the applied force.

• E) Cart A will have a change in motion after the application of the applied force.

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According to Newton’s first law, what happens to the driver just after the car stops?

• Because of inertia, the driver continues moving in a forward direction causing the driver to crash into the car window.

• The driver immediately stops moving along with the car.

• The driver moves backward due to the sudden stop.

• The driver remains suspended in the air.

According to Newton’s first law, what happens to the riders just after the cart turns right to follow the track?

A horseshoe has a mass of 4.1 kilograms. What net force, to the nearest whole newton, will a player need to apply to accelerate the horseshoe at a rate of 2.5 m/s²?

• 10 N

• 8 N

• 12 N

• 15 N

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Six airplanes are flying with a constant speed before each airplane experiences an unbalanced force of 10N. Which 2 airplanes have the greatest acceleration? Select 2 correct answers.

• A) Airplane 1 and Airplane 2

• B) Airplane 2 and Airplane 6

• C) Airplane 3 and Airplane 5

• D) Airplane 4 and Airplane 6

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8. An appliance worker pushes a 15.5 kilogram refrigerator across a smooth floor with a net force of 5N. What is the approximate acceleration of the refrigerator? Round to the nearest hundredths.

• 0.32 m/s²

• 0.45 m/s²

• 0.29 m/s²

• 0.50 m/s²

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NGSS.MS-PS2-2

9. An appliance worker pushes a 36.9 kilogram refrigerator across a smooth floor with a net force of 9N. What is the approximate acceleration of the refrigerator? Choose the correct answer from the options below. Round to the nearest hundredths.

• 0.24 m/s²

• 0.30 m/s²

• 0.35 m/s²

• 0.40 m/s²

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A race car is powered with a 1500 horsepower engine as it races down a track. It has a mass of 250kg. It travels down the racetrack with a net force of 500N. What is the correct formula to use to calculate the acceleration of the car down the racetrack?

• Acceleration = mass / force

• Acceleration = mass x force

• Acceleration = force / mass

• Acceleration = mass + force

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A hockey player hits five different pucks with the hockey stick. The mass of each puck is shown below. Which puck has the greatest applied force to lowest applied force?

• Puck 4

• Puck 3

• Puck 1

• Puck 5

• Puck 2

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