|Nov4-09, 04:45 PM||#1|
How to find net force using mass, distance, and time?
1. The problem statement, all variables and given/known data[/B]
A 2.0 kg otter starts from rest at the top of a muddy incline 85 cm long and slides down to the bottom in 0.50 s. What net force acts on the otter along the incline?
mass = 2.0 kg
distance = 85 cm
time = .50 s
net force = ?
2. Relevant equations
I also used.
3. The attempt at a solution
340 cm/s^2 = 3.4 m/s^2
(2.0 kg)(3.4 m/s^2)= 6.8 N
The book says the right answer is 14 N though.
|Nov4-09, 06:01 PM||#2|
|Nov4-09, 08:58 PM||#3|
Hi elkosp16, you need to use the formula :
Δ X = Vi*T + (1/2)*a*T^2
You already know displacement (ΔX), 85 cm (remember to convert it to meters !)
Initial velocity (Vi) is 0, because it starts at rest.
Time = .50 seconds,
Plug everything in and solve for a,
once you get acceleration, use newtons second law.
plug in mass & acceleration, the answer is net force.
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