Consider the 65.0 kg ice skater being pushed by two others shown in the figure. Frot F, F, Free-body diagram F2 F, (a) Find the direction (in degrees) and magnitude (in N) of Frot, the total force exerted on her by the others, given that the magnitudes F, and F2 are 22.0 N and 15.0 N, respectively. ° (counterclockwise from the direction of F, is positive) direction magnitude N (b) What is her initial acceleration (in m/s2) if she is initially stationary and wearing steel-bladed skates that point in the direction of Frot? (c) What is her acceleration (in m/s2) assuming she is already moving in the direction of F,tot? Remember that friction is always in the opposite direction of motion or attempted motion between surfaces in contact. m/s? (in the direction of Frot)

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### Physics Problems Involving Forces and Motion

#### Problem 3

Consider a 65.0 kg ice skater being pushed by two others. The problem explores the dynamics of the forces applied.

- **Diagram Overview:** 
  - The diagram shows a vector representation of the forces acting on the skater: \( F_1 \) and \( F_2 \).
  - \( F_{\text{tot}} \) is the resultant vector of these forces.
  - A free-body diagram indicates the orientation of \( F_1 \) and \( F_2 \).

##### (a) Calculating the Resultant Force
- **Objective:** Find the direction (in degrees) and magnitude (in N) of \( F_{\text{tot}} \).
- **Given Forces:**
  - \( F_1 \) = 22.0 N
  - \( F_2 \) = 15.0 N
- **Direction Note:** Counterclockwise from \( F_1 \) is considered positive.

##### (b) Initial Acceleration Calculation
- **Objective:** Determine the initial acceleration (in \( \text{m/s}^2 \)).
- **Condition:** The skater is initially stationary and aligns with \( F_{\text{tot}} \).

##### (c) Acceleration While Moving
- **Objective:** Calculate the acceleration assuming motion in the direction of \( F_{\text{tot}} \).
- **Consideration:** Friction acts opposite to motion or attempted movement.

#### Problem 4

Calculate the maximum deceleration (in \( \text{m/s}^2 \)) of a car on a 10° slope under various conditions. Assume the weight is evenly distributed and static friction applies.

- **Slope Details:** The slope angle is 10° relative to horizontal.

##### (a) Deceleration on Dry Concrete
- **Objective:** Find the deceleration in \( \text{m/s}^2 \).

##### (b) Deceleration on Wet Concrete
- **Objective:** Find the deceleration in \( \text{m/s}^2 \).

##### (c) Deceleration on Ice
- **Objective:** Assume \( \mu_s = 0.100 \) for shoes on ice and find deceleration in \( \text{m/s}^2 \).

**Note:** Additional materials and readings may aid in solving these problems, focusing on vector math and friction principles.
Transcribed Image Text:### Physics Problems Involving Forces and Motion #### Problem 3 Consider a 65.0 kg ice skater being pushed by two others. The problem explores the dynamics of the forces applied. - **Diagram Overview:** - The diagram shows a vector representation of the forces acting on the skater: \( F_1 \) and \( F_2 \). - \( F_{\text{tot}} \) is the resultant vector of these forces. - A free-body diagram indicates the orientation of \( F_1 \) and \( F_2 \). ##### (a) Calculating the Resultant Force - **Objective:** Find the direction (in degrees) and magnitude (in N) of \( F_{\text{tot}} \). - **Given Forces:** - \( F_1 \) = 22.0 N - \( F_2 \) = 15.0 N - **Direction Note:** Counterclockwise from \( F_1 \) is considered positive. ##### (b) Initial Acceleration Calculation - **Objective:** Determine the initial acceleration (in \( \text{m/s}^2 \)). - **Condition:** The skater is initially stationary and aligns with \( F_{\text{tot}} \). ##### (c) Acceleration While Moving - **Objective:** Calculate the acceleration assuming motion in the direction of \( F_{\text{tot}} \). - **Consideration:** Friction acts opposite to motion or attempted movement. #### Problem 4 Calculate the maximum deceleration (in \( \text{m/s}^2 \)) of a car on a 10° slope under various conditions. Assume the weight is evenly distributed and static friction applies. - **Slope Details:** The slope angle is 10° relative to horizontal. ##### (a) Deceleration on Dry Concrete - **Objective:** Find the deceleration in \( \text{m/s}^2 \). ##### (b) Deceleration on Wet Concrete - **Objective:** Find the deceleration in \( \text{m/s}^2 \). ##### (c) Deceleration on Ice - **Objective:** Assume \( \mu_s = 0.100 \) for shoes on ice and find deceleration in \( \text{m/s}^2 \). **Note:** Additional materials and readings may aid in solving these problems, focusing on vector math and friction principles.
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