What do you feel when you touch a nail immediately after it is hammered into a wooden plank? Why? Taking out paste from a tooth paste tube is an example to highlight which physical property? The force applied by player makes the football move towards the goal. Player applies a force on the stationary football while taking a penalty kick is football match.A rest rubber ball begins to move, when a force applied on it.Give two examples to verify that a force tends to change the static condition of a body. If you pull a rubber band, it becomes longer.If you squeeze a sponge, its shape changes.Give two examples to verify that a force changes the shape of a body.įorce can change the static condition of a body. Answer the following in one or two sentences (LOT) It is due to the surface tension of water. (b) If both assertion and reason are true, but reason is not the correct explanation of assertion Reason : Water strider experiences less buoyant force. So lesser pressure is produced.Īssertion : Water strider slides easily on the surface of water. The weight of the bags falls on larger area of shoulder. (b) Both assertion and reason are true, but the reason is not the correct explanation of the assertion Reason : Broad straps last for long life. (a) Both assertion and reason are true and the reason is the correct explanation of the assertionĪssertion : Broad straps are used in bags. Reason : Sharp edges exert more pressure. (d) If the assertion is false, but the reason is true.Īssertion : Sharp knives are used to cut the vegetables. (c) If the assertion is true, but the reason is false. (b) If both assertion and reason are true, but the reason is not the correct explanation of the assertion. (a) If both assertion and reason are true and the reason is the correct explanation of the assertion. Calculate the force required to raise the output piston.ġ0 5 = \(\frac \) A 100 N force applied to the input piston raises the output piston. The surface area of the output piston is 3000 cm 2. In a hydraulic lift, the surface area of the input piston is 10 cm 2. Calculate the pressure exerted by it if it makes a contact with a surface of area 25 cm2. Knot in a thread : _ friction :: ball bearing : friction _ĭownward force : weight :: Upward force offered by liquid : _Ī stone weighs 500 N. Glass plate, silver plate, paper, cotton cloth, card board.
Arrange the choice of the material such that a marble moving over it covers a greater distance.Ĭotton cloth, glass plate, paper, card board, silver plate Let a marble roll on the following surfaces. Static friction, Rolling friction, Sliding friction.
Rolling friction, static friction, sliding friction Arrange the following in the increasing order Viscosity depends on the pressure of a liquid. Surface tension causes the spherical nature of a water drop. Using barometers, one can measure the atmospheric pressure. Using barometers, one can measure the height of a building. Liquid pressure decreases with the decrease of depth. Rolling friction is slightly lesser than the sliding friction.įriction is the only reason for the loss of energy. Rolling friction is slightly greater than the sliding friction. One atmosphere is equivalent to 1,00,000 newton force acting on one square metre. State whether the following statements are true or falseįorce acting on a given area is called pressure.Ī moving body comes to rest due to friction alone.Ī body will sink if the weight of the body is greater than the buoyant force. A simple barometer was first constructed by …………….The property of …………… of a liquid surface enables the water droplets to move upward in plants.Hydraulic lift works under the principle of ……………….The pressure of a liquid column …………….Which of the following liquids has more viscosity? The value of the atmospheric pressure at sea level is – Pressure exerted by a liquid is increased by – If we apply a force against the direction of motion of a body, then the body will – Tamilnadu Samacheer Kalvi 8th Science Solutions Term 1 Chapter 2 Forces and Pressure Samacheer Kalvi 8th Science Forces and Pressure Text Book Exercises
#Forces and newton ii law experiment download
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