Unit 3 Remediation: Forces and Newton's Laws

What is the unit of force in the International System of Units (SI)?

• Joule

• Newton

• Pascal

• Watt

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DOK Level 1: Recall

Which of the following best describes the normal force?

• A force that acts parallel to the surface

• A force that acts perpendicular to the surface

• A force that acts in the direction of motion

• A force that acts opposite to the direction of motion

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DOK Level 1: Recall

• 9.8 N

• 19.6 N

• 2 N

• 4.9 N

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DOK Level 2: Skill/Concept

A 5 kg object is subjected to a net force of 20 N. What is the acceleration of the object?

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DOK Level 2: Skill/Concept

If a car is moving at a constant velocity, what can be said about the net force acting on it?

• The net force is zero

• The net force is equal to the weight of the car

• The net force is equal to the frictional force

• The net force is equal to the normal force

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DOK Level 1: Recall

A cute little puppy dog is placed in an elevator that is accelerating upwards. How does the normal force compare to the force of gravity on the cute little puppy dog?

• Normal force is greater

• Force of gravity is greater

• the forces are equal

• there's no way to know without the mass of the cute little puppy dog

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DOK Level 2: Skill/Concept

A box is pushed with a force of 50 N on a frictionless surface so that it accelerates at 5 m/s/s. What is the acceleration of the box if the force and mass are both doubled?

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DOK Level 2: Skill/Concept

Explain why the normal force is not always equal to the weight of an object.

• The normal force is always equal to the weight of an object.

• The normal force can be less than the weight if the object is on an inclined plane. (Hint: This is true. lol)

• The normal force can be greater than the weight if the object is accelerating upwards.

• Both B and C

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DOK Level 3: Strategic Thinking

A 15 kg object is at rest on a horizontal surface. A horizontal force of 45 N is applied to the object. If the coefficient of static friction between the object and the surface is 0.3, will the object move?

• Yes, because the applied force is greater than the maximum static friction force.

• No, because the applied force is less than the maximum static friction force.

• Yes, because the applied force is equal to the maximum static friction force.

• No, because the applied force is equal to the maximum static friction force.

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DOK Level 3: Strategic Thinking

A 20 kg object is placed on a horizontal surface. If the coefficient of kinetic friction is 0.4, what is the frictional force acting on the object when it is in motion?

• 8 N

• 20 N

• 78.4 N

• 80 N

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DOK Level 2: Skill/Concept