Math Problem Statement
- A 0.20-kg hockey puck initially traveling 5.0 m/s is pushed on ice by a hockey stick with a constant force of 7.0 N over a distance of 8.0 m. Friction is negligible. Determine the final velocity of the hockey puck.
Solution
To determine the final velocity of the hockey puck, we can apply the work-energy theorem, which states that the work done on an object is equal to its change in kinetic energy.
Step 1: Calculate the initial kinetic energy (KE₁)
The initial kinetic energy is given by: Where:
- (mass of the puck)
- (initial velocity)
Step 2: Calculate the work done by the force
The work done by the force is: Where:
- (force applied)
- (distance over which the force is applied)
Step 3: Calculate the total kinetic energy (KE₂)
The total kinetic energy after the force is applied is:
Step 4: Calculate the final velocity
The final kinetic energy is related to the final velocity by: Solving for :
Thus, the final velocity of the hockey puck is 24.2 m/s.
Would you like more details or have any questions?
Here are 5 related questions to explore further:
- What would happen to the final velocity if the mass of the puck was doubled?
- How would the final velocity change if the applied force was halved?
- How much work would need to be done to bring the puck to rest after it reaches its final velocity?
- What would the final velocity be if friction were not negligible?
- How does the final velocity change if the initial velocity is increased?
Tip: Remember that work and energy concepts are closely related to force and motion. Understanding the work-energy principle can simplify many physics problems involving varying forces and distances.
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Math Problem Analysis
Mathematical Concepts
Work-Energy Theorem
Kinetic Energy
Force and Motion
Formulas
KE_1 = (1/2) m v_1^2
W = F * d
KE_2 = KE_1 + W
v_2 = sqrt((2 * KE_2) / m)
Theorems
Work-Energy Theorem
Suitable Grade Level
Grades 10-12
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