earth exerts a downward gravitational force of 8.9 n on a cake that is resting on a plate. the plate exerts a force of 11.0 n up
ward on the cake, and a knife exerts a downward force of 2.1 n on the cale.
1 answer:
See the free-body diagram in attachment. (please rotate it such that N points upward)
Explanation:
The free body diagram (FBD) of an object is a diagram representing all the forces acting on a body. Each force is represented using an arrow, where:
- The length of the arrow is proportional to the magnitude of the force
- The direction of the arrow shows the direction of the force
In this problem, we have 3 forces acting on the cake:
- The force of gravity, downward, of magnitude (mg) (where m is the mass of the cake and g is the acceleration of gravity), equal to 8.9 N
- The force exerted by the knife on the cake, F = 2.1 N, acting downward
- The normal reaction exerted by the plate on the cake, N = 11.0 N, acting upward
The 3 forces are shown in the diagram attached. We also notice that the vector sum of all the forces is zero, in fact:
This means that the acceleration of the cake is zero, so the cake is in equilibrium.
Learn more about forces and weight here:
#LearnwithBrainly
You might be interested in
Answer:
Explanation:
We know that when we don't have air friction on a free fall the mechanical energy (I will symbololize it with ME) is equal everywhere. So we have:
where me(1) is mechanical energy while on h=10m
and me(2) is mechanical energy while on the ground
Ek(1) + DynamicE(1) = Ek(2) + DynamicE(2)
Ek(1) is equal to zero since an object that has reached its max height has a speed equal to zero.
DynamicE(2) is equal to zero since it's touching the ground
Using that info we have
we divide both sides of the equation with mass to make the math easier.