Force and Pressure Flashcards
(25 cards)
What is Force?
Pushes and Pulls are forces.
SI Unit of Force
Newton
Does interaction apply force?
Yes
What is Resultant Force?
When forces are applied on an object in the same or opposite direction, they add or subtract from the two forces. This is known as the Resultant Force
What are the effects of Force
The effects of Force are:
1. Force can make a stationary object move, or change the position of rest
2. Force can change the speed of the moving object
3. Force can change the direction of the moving object
4. Force can change the size and shape of a moving object
How is Force described?
Force is described by stating its magnitude and direction
What are the types of forces? Give examples.
The types of forces are:
1. Contact force
Examples: Muscular Force, Frictional Force
2. Non-Contact Force
Examples: Gravitational Force, Magnetic Force, Electrostatic Force
What is Muscular Force?
The force exerted by the muscles of your body is called Muscular Force.
What is Frictional Force?
Friction is a force that slows things down or prevents things from moving
What is Gravitational Force?
Gravitational Force is the force with which the Earth pulls everyone towards it.
What is Magnetic Force?
The force used to lift metal objects is known as the magnetic force.
Why does a magnet act from a distance?
A magnet can act from a distance as it is surrounded by a field of magnetic force.
What is Electrostatic Charge?
The static energy present in the objects is known as electrostatic charge.
Can Electrostatic Charge be negative or positive?
Yes, Electrostatic charge can be positive or negative.
What is pressure?
Pressure is force exerted per unit area.
SI unit of Pressure
N/m2 or Pascal (Pa)
Formula of Pressure
Pa= N/m2
Pressure increases with depth in liquids. True/False
True
What is the instrument used to measure depth?
Pressure Gauge or Manometer.
What is Atmospheric Pressure?
Atmospheric pressure is the pressure exerted by the atmosphere to all objects.
What causes Atmospheric Pressure?
The air in the atmosphere presses down on us with a force equal to that exerted by a mass of 1 kilogram on every square centimeter.
Why are we not crushed by atmospheric pressure?
The reason we are not crushed under this weight is that the pressure exerted by the fluids in our body is equal (or opposite) to the atmospheric pressure acting on our body, and so cancels the effect of the atmospheric pressure.
Explain with an Experiment that Atmospheric pressure is exerted in all directions.
Take a plastic bottle. Put some boiling water in it. The steam coming out of the water will expel most of the air from inside the bottle. After about two minutes, screw the cap tightly on the bottle. Put the bottle in a trough and pour some cold water mixed with ice into it. As the bottle cools down, the stream condenses. Does the bottle get crushed? Yes, it does get crushed as the atmospheric pressure is less inside and is more outside, so the atmospheric pressure is exerted in all directions and crushes the bottle.
What are the factors affecting atmospheric pressure?
The factors affecting atmospheric pressure are:
Altitude
Temperature
Humidity
