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Dmitry [639]
3 years ago
14

Why is knowing the direction of the force important?

Physics
1 answer:
vodomira [7]3 years ago
4 0
Knowing the direction of a force is important because it helps someone know the motion of the object. if you use a free body diagram, then it becomes easy to see all the forces being applied to an object. if there is more force going one way, the object is accelerating in that direction. if all the forces cancel each other out, then the object is at a constant speed or is at rest.
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Help please !!<br>I need help with this!
belka [17]
Hello Again! I think the Answer might be 220 m! ( 1/2) ( 21 m/s + 0 m/s) (21 s) = 220 m
6 0
3 years ago
A second class lever needs less effort to lift a heavy load.why give reason​
Marrrta [24]

Answer:second class lever needs less force to lift a load

Explanation: because the load is between the fulcrum/pivot point and the force. The fulcrum is far away from the force

7 0
3 years ago
The two blocks a and b have a mass of 5 kg and 10 kg, respectively. if the pulley can be treated as a disk of mass 3 kg and radi
never [62]
I will name block a as Ma=5 kg, block b as Mb=10 kg and mass of the pulley M=3 kg and radius as R. Since the system will accelerate in the direction of the block b because it has greater mass, I will take that direction as positive. Both blocks and the pulley have the same acceleration because the slipping on the pulley is neglected. First, the equations of motion:

Mb*g-Tg=MbαR and
Ta-Ma*g=MaαR,

where Ta and Tb are the tensions of the cord, g=9.81 m/s^2 and α is the angular accereration. Also a=αR where a is the acceleration of the system. 

Now the equation of rotational dynamics of a solid body:

(Tb-Ta)R=Iα=(1/2)*M*R^2*α, where (1/2)*M*R^2 is the moment of inertia of a disc. 

When we input Tb=Mb*g - Mb*α*R and Ta=Ma*g + Ma*α*R from the first two equations into the third we get: (Mb*g - Mb*α*R - Ma*α*R - Ma*g)*R=(1/2)*M*R^2*α.

We solve for α and get: α=(Mb*g-Ma*g)/((1/2)*MR+Mb*R+Ma*R)=2.97 rad/s^2.

We know that a=α*R and we easily get a=0.4455 m/s^2
4 0
3 years ago
One cubic centimeter is the same volume as one......?
Leya [2.2K]
1 cubic centimeter=1 millimeter
3 0
3 years ago
Read 2 more answers
A camera of weight 8.9 newtons is dropped from a drone at a height of 18.6 meters and enters free fall. Assuming no air resistan
Svetlanka [38]

Answer:

19.09 m/s

Explanation:

u = 0, h = 18.6 m

Use third equation of motion

v^2 = u^2 + 2 g h

v^2 = 0 + 2 x 9.8 x 18.6

v = 19.09 m/s

4 0
4 years ago
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