The speed of a bobsled is increasing because it has an acceleration of 2.4 m/s2. At a given instant in time, the forces resisting the motion, including kinetic friction and air resistance, total 450 N. The mass of the bobsled and its riders is 235 kg.
(a) What is the magnitude of the force propelling the boblsed forward?
1 N
(b) What is the magnitude of the net force that acts on the bobsled?
2 N
To find the magnitude of the force propelling the bobsled forward, we can use Newton's second law of motion, which states that the net force acting on an object is equal to the mass of the object multiplied by its acceleration.
(a) The formula to calculate force is:
Force = mass x acceleration
Given:
Acceleration (a) = 2.4 m/s^2
Mass (m) = 235 kg
Substituting the values into the formula:
Force = 235 kg x 2.4 m/s^2
= 564 N
Therefore, the magnitude of the force propelling the bobsled forward is 564 N.
(b) The magnitude of the net force acting on the bobsled can be found by subtracting the forces resisting motion from the force propelling the bobsled forward.
Given:
Forces resisting motion (R) = 450 N
Force propelling the bobsled forward (F) = 564 N
Net Force (N) = F - R
= 564 N - 450 N
= 114 N
Therefore, the magnitude of the net force acting on the bobsled is 114 N.
To find the magnitude of the force propelling the bobsled forward, we need to use Newton's second law of motion, which states that the net force acting on an object is equal to the mass of the object multiplied by its acceleration.
(a) To calculate the force propelling the bobsled forward, we can use the formula:
Force = Mass x Acceleration
Given: Mass (m) = 235 kg
Acceleration (a) = 2.4 m/s^2
Plugging in the values, we have:
Force = 235 kg x 2.4 m/s^2
Calculating this, we find that the force propelling the bobsled forward is:
Force = 564 N
Therefore, the magnitude of the force propelling the bobsled forward is 564 N.
To find the magnitude of the net force acting on the bobsled, we need to subtract the forces resisting the motion from the force propelling the bobsled forward.
(b) Net Force = Force propelling the bobsled forward - Forces resisting the motion
Given: Forces resisting the motion = 450 N
Net Force = 564 N - 450 N
Calculating this, we find that the magnitude of the net force acting on the bobsled is:
Net Force = 114 N
Therefore, the magnitude of the net force that acts on the bobsled is 114 N.
A) Magnitude of the force propelling sled:
F=M*A M= mass of sled and crew A= given acceleration
235Kg*2.4m/s = 564 N
B) Net force is Force +/- all opposing or resisting forces.
450 N works against so it is negative.
564 - 450 N = +114 N = Net force acting upon the sled. :>
ma=F-F(fr) .
F=ma+F(fr) = 235•2.4 + 450 = 1014 N
(b)
F(net) = ma = 235•2.4 = 524 N