Answer:
The force of gravity is acting on the acorn.
A frictional drag force is acting on the acorn.
The net force on the acorn is less than the force of gravity.
Explanation:
The force of gravity is acting on the acorn is in vertically downwards direction.
A frictional drag force is acting on the acorn is in vertically upwards direction.
The net force on the acorn is given by
Net force = Force of gravity - Frictional drag force
It is always less than the force of gravity.
Answer:
See the explanation below.
Explanation:
A lever is a simple machine that changes the magnitude and direction of the force applied to move an object. Minimizes the force needed to lift the object.
By means of the following image, we can see the principle of operation of a lever.
The load can be moved thanks to the force multiplied by the distance to the fulcrum.
Answer
given,
mass of the ball = 3 kg
swing in vertical circle with radius = 2 m
work done by the gravity = ?
work done by the tension = ?
Work done by the gravity = - m g Δh
Δ h = 2 + 2 = 4 m
Work done by the gravity =
= -117.6 J
work done by gravity is equal to -117.6 J
Work done by tension will be equal to zero.
Zero because tension is always perpendicular to velocity
work done by tension is equal to 0 J