what is the SI unit of Force? . what is force and pressure? what is repulsion? define-:
. why there are big double tyres in the backside of a truck/bus.
. A tin can collapses when air is removed. why?
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Answers
Answer:
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Explanation:
FORCE
Force cannot be seen, heard, or tasted. Only its effects can be felt or seen. The various effects of force are:
1. It can move a body initially at rest.
2. It can bring a moving body to rest.
3. It can change the direction of a moving body.
4. It can change the speed of a moving body.
5. It can change the shape of a body.
6. It can change the size of a body.
Let us take an example of a football lying in a field (fig – A). When a player hits the ball, it starts moving, i.e., it starts moving only when we apply force. Thus, force can move a body initially at rest.
Now, if the goalkeeper catches the moving ball (fig – B), then it comes to rest. The goalkeeper applies a force to stop the moving ball. Hence, we can say that force can bring a moving body to rest.
If another player kicks the moving ball in the opposite direction (fig – C), then it starts moving in the direction
towards which it is kicked i.e. the direction of the football changes. The player applies force on the football to change its direction. Hence, force can change the direction of a moving body. Also, if the player hits the ball hard, then the net speed of the ball will also change. Hence, the speed of a moving body can be changed by applying force.
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1) newton
The SI unit of force is the newton, symbol N. The base units relevant to force are: The metre, unit of length — symbol m. The kilogram, unit of mass — symbol kg.
2)A force can be a push or a pull. When a force is exerted on an object it can change the object's speed, direction of movement or shape. Pressure is a measure of how much force is acting upon an area. Pressure can be found using the equation pressure = force / area.
3)Repulsion is' a movement between two charges that are identical or similar. The force of two electrons between them (negative charge). ... Magnetism, operating at a distance, is a force of desire or repulsion. A metric with the changing gravitational mass of a system originates from the repulsive force.
4) Buses and trucks have double wheels at the back because these are heavy vehicles with most of the loads resting towards the back. Also, the engine that drives the vehicle is attached to the back wheels so the double back wheels provides better hold on the ground.
5) The air inside a tin can exerts pressure against the interior surface that pushes the walls of the can outward and the air outside of the can exerts pressure that pushes the sides inward. ... The result is that the tin can collapses when the air inside is removed.