8.7A Newton's Second Law of Motion REVIEW

A young girl is visiting a pumpkin patch and pulls her empty wagon to fill with pumpkins. As she puts pumpkins in her wagon, how will the amount of force needed to pull the wagon change?

• The amount of force needed will not change because the acceleration of the wagon will remain the same.

• The amount of force needed will decrease because the amount of mass in the wagon will decrease.

• The amount of force needed will decrease because the acceleration of the wagon will increase.

• The amount of force will increase because the amount of mass in the wagon will increase.

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Two forces are applied to a 20kg box resting on a smooth surface as shown.

Which statement best describes the acceleration of the box?

• The box does not accelerate because the forces acting on the box are balanced.

• The box accelerates at 3m/s2 because the combined forces cause the box to accelerate.

• The box accelerates at 1m/s2 to the right, because the net force is 20N to the right.

• The box accelerates at 20m/s2 to the right because the net force is 20N to the right.

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As vehicles are exiting the expressway, the mass of each vehicle and the net forces acting on them are recorded on a data table. Which vehicle has the greatest acceleration as it exits the expressway?

• Motorcycle

• Suburban

• Compact Car

• Truck

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How much force is needed in order to accelerate a 0.05 kg arrow from a bow with an acceleration of 2680m/s2?

• 1340 N

• 53600 N

• 13.4 N

• 134 N

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Four bowling balls are rolling with constant speed before each ball experiences an unbalanced force of 10 N.

Which bowling ball would experience the greatest acceleration when the unbalanced force is applied?

• The bowling ball with a mass of 7 kg.

• The bowling ball with a mass of 9 kg.

• The bowling ball with a mass of 5 kg.

• The bowling ball with a mass of 3 kg.

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This diagram shows 2 different forces acting on a person riding a skateboard. The total mass of the skateboarder and the skateboard is 67 kg. Based on this information, what is the acceleration of the skateboarder? Record to the nearest hundredths place value.

Mathematical Equivalence

ON

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An object accelerates 10 m/s2 when a force of 4 N is applied to it. What is the mass of the object?

• 0.4 kg

• 14 kg

• 40 kg

• 2.5 kg

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What is the acceleration of a 5kg object pushed with force of 500N?

Mathematical Equivalence

ON

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The acceleration of an object is dependent on the mass of the object and the net (a)   acting on the object.

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Two forces are applied to a toy car as shown. The toy car has a mass of of 0.2 kg and is on a smooth surface. Which statement best describes the acceleration of the toy car?

• The acceleration is 30 m/s² to the left.

• The acceleration is 15 m/s² to the left.

• The acceleration is 3 m/s² to the left.

• The acceleration is 15 m/s² to the right.

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