Name these forces
(a) the upward push of water on a submerged object
(b) the force which wears away two surfaces as they move over one another
(c) the force which pulled the apple off Isaac Newton's tree.
Answers
(a) Buoyant Force (b) Friction Force (c) Gravitational Force.
Explanation:
1. When a body submerged in liquid. Body feel a upward force by liquid. This upward force is known as Buoyant force. Its direction is in upward.
Magnitude of buoyant force depend upon density of liquid, volume of liquid displaced by object and gravitational acceleration.
2. When two body have tendency to move with respect to other, both body exert a opposing force known as friction force.
Point to remember about friction force that
a) It act of contact surface of two body.
b) Its direction is always opposite to motion of contact point of body.
c) It depend upon surface roughness of body.
3. There are a force between two body which are kept at a particular distance. That force is known as gravitational fore given by Isaac Newton.
Point to remember about Gravitational force that
a) It depend upon product of mass of two object.
b) It depend upon inverse proportion of square of distance between two object.
In question c) Here one object is apple while second object is earth. So There are force between apple and earth is gravitational force.
Gravitational Force is Pull by Earth
Explanation:
(a) Buoyant force - is the upward force of water.
(b) Force of friction - is the force that wears away two surfaces as they move over each other.
(c) Gravitational force - the force that pulls any mass on earth.