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Identify the agent exerting the force, the object on which the force is acting and the effect of the force in the following situation
A child jumping to a height.
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Multiple choice question.
A kind of matter which can sublime is
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Multiple choice question.
A substance which can change its state
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Define the term efficiency of a machine.
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Solve the following numerical problem.
Two horses pull a cart in the same direction with a force of 500 N each. Find the resultant force acting on the cart.
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Solve the following numerical problem.
Two force of 12 N and 25 N act on a body to the left-hand side, while another force of 35 N acts on it to the right-hand side. Find the resultant of the forces.
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Solve the following numerical problem.
Two persons are pushing a car with a force of 30 N and 70 N in opposite directions. Calculate the resultant force and its direction.
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Solve the following numerical problem.
The forces acting on a wooden block are shown in the figure given alongside. Find the resultant of the forces and the direction of the resultant force.
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State if the following statement is true or false. Correct the statement if it is false.
Friction wears down the parts of machi
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State if the following statement is true or false. Correct the statement if it is false.
Tires of vehicles are provided with grooved designs to decrease friction.
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Answer the following in a word or two or in a sentence.
A child tries to slide a wooden block on the top of a table, but she is unable to get a smooth movement. What material do you suggest she should use in between the block and the table to get a smooth movement?
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Answer the following in short.
Why do wrestlers rub powder on their hands before getting into the ring?
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Give a reason for the following.
Vehicles skid on muddy and wet roads. Suggest what type of tires can prevent skidding of vehicles?
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Give a reason for the following.
Boats and ships have streamlined shapes?
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Tick the most appropriate answer.
The force applied on a machine to do work is called the
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Answer the following in a word or two or in a sentence.
Write the formula for calculating the efficiency of a machine.
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Answer the following in short.
What do you understand by the term efficiency of a machine’?
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Give a reason for the following.
The efficiency of a machine is always less than 100%.
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Name the type of force which act in the following case:
A string hangs with a load.
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