Kinetic and Static Friction AP Style Questions
Authored by ELIZABETH WOODARD
Physics
11th Grade
NGSS covered
Used 14+ times
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This quiz focuses on friction forces in physics, specifically the concepts of static and kinetic friction across various scenarios including inclined planes, horizontal surfaces, and complex multi-body systems. Designed for 11th-grade students, these Advanced Placement level questions require a deep understanding of force analysis, Newton's laws of motion, and the mathematical relationships governing friction. Students must master the fundamental equations for static friction (f_s ≤ μ_s × N) and kinetic friction (f_k = μ_k × N), while applying these concepts to analyze equilibrium conditions, constant velocity motion, and accelerated motion. The problems demand sophisticated reasoning skills to decompose forces into components, apply free-body diagram analysis, and understand the distinction between maximum static friction and actual static friction forces. Students need to recognize that friction coefficients are material properties independent of mass and surface area, and they must be able to predict when objects will remain stationary versus when they will begin sliding. Created by Elizabeth Woodard, a Physics teacher in the United States who teaches grade 11. This comprehensive assessment serves as an excellent tool for evaluating student mastery of friction concepts before AP Physics examinations, and it can be effectively used for review sessions, homework assignments, or formative assessment to identify areas where students need additional support. The quiz works particularly well as a warm-up for laboratory activities involving friction experiments or as practice problems before summative assessments. Teachers can assign individual questions for targeted practice or use the complete set for comprehensive review of friction applications. The variety of scenarios presented allows students to see how friction principles apply across different contexts, from simple horizontal surfaces to complex inclined plane problems. These questions align with AP Physics 1 standards, particularly those addressing forces and Newton's laws (2.B.1, 3.A.2, 3.A.3), where students must analyze how forces affect motion and apply Newton's laws to predict and explain motion in various situations involving friction.
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9 questions
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1.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Tags
NGSS.HS-PS2-1
2.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
6.0 N
9.0 N
10.4 N
13.4 N
Answer explanation
Tags
NGSS.HS-PS2-1
3.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
A block of mass m slides between two rough plates as it moves downward without stopping. The sides of the block stay in contact with the plates throughout its motion and the plates exert constant normal forces on the block. In Figure 1, the block has half its length between the plates, and the left plate exerts a force F1 on it. In Figure 2, the block is entirely between the plates, and the left plate exerts a force F2 on it. In Figure 3, half of the block’s length has exited the plates, and the left plate exerts a force F3 on it. Which of the following correctly compares the forces F1, F2, and F3?
F1 < F2 < F3
(F1 = F3) < F2
(F1 = F3) > F2
F1 = F2 = F3
Answer explanation
Tags
NGSS.HS-PS2-1
4.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
A student of mass 45 kg slides down a ramp that is inclined at an angle of 30° above the horizontal. The magnitude of the student’s acceleration is 2 m/s². The coefficient of kinetic friction between the student and the ramp is most nearly
0.23
0.30
0.35
0.92
Tags
NGSS.HS-PS2-1
5.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
In Scenario 1, a block of mass m slides across a rough floor with initial speed v. The block slides a distance d1 before coming to rest. In Scenario 2, a block of mass 2m, made of the same material as the block in Scenario 1, slides across the same rough floor with the same initial speed v. The block slides a distance d2 before coming to rest. How do d1 and d2 compare?
d1 < d2
d1 = d2
d1 > d2
The comparison cannot be made without knowing the surface areas of the blocks.
Answer explanation
Tags
NGSS.HS-PS2-1
6.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Boxes A and B are made of the same material and are both at rest on the same rough incline. Box A has mass m and Box B has mass 2m. Which of the following claims about the magnitude of the force of static friction exerted on the boxes by the surface is correct?
It is the same for both boxes.
It is greater for Box A.
It is greater for Box B.
It may or may not be the same depending on the surface area of the boxes in contact with the surface.
Answer explanation
7.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
The force of static friction on the box will be equal to F.
The box will begin sliding to the left.
The box will begin sliding to the right.
Answer explanation
Tags
NGSS.HS-PS2-1
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