What makes a balance faulty?
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Force, Work, Energy and Power question types
282 questions across 6 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.
282
Questions
6
Question groups
5
Question types
01
[1 Mark Question Answer]
112 Q→02[2 Mark Question Answer]
108 Q→03[3 Mark Question Answer]
38 Q→04[5 Mark Question Answer]
11 Q→05MCQ
1 Q→06fill in the blanks.
12 Q→Sample Questions
Force, Work, Energy and Power questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
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Define Mechanical advantage
Define Lever
Give an example
Electrical energy changes to heat energy.
Electrical energy changes to heat energy.
Give an example
Light energy changes to electrical energy.
Light energy changes to electrical energy.
Class I lever can have M.A. = 1, M.A. < 1 and M.A. > 1. Explain each giving examples.
Define Efficiency
Define Velocity Ratio
Define Simple machine
Find the kinetic energy of a car of mass 1000 kg traveling at 72 km/h.
The arms of a beam balance are 20 cm and 21 cm, but the pans are of equal weight. By the method of double weighing the weights are found to be 1000 g and 20 g. Find the actual weight of the body
A faulty balance of equal arms but pans of unequal weight is used to find the weight of a body. By the method of double weighing the weights are found as $8 \ kg$ and $8.2 \ kg$ . Find the actual weight of the body.
View full solution →(a) Fig represents an incomplete diagram of a simple string pulley system. Copy this diagram on a new page and complete it and mark where the effort must be applied to lift the load.
(b) What is the velocity ratio of this system?
(c) If the pulley system is 80% efficient and the load is 720 N, then
(i) What effort must be applied to lift the load?
(ii) What work must be done must be done in lifting the load through a distance of 2 m using this machine?
(b) What is the velocity ratio of this system?
(c) If the pulley system is 80% efficient and the load is 720 N, then
(i) What effort must be applied to lift the load?
(ii) What work must be done must be done in lifting the load through a distance of 2 m using this machine?
A pair of nut crackers is 12 cm long. An effort of 10 gf is required to crack a nut which is passed at a point 3 cm from the finger. Calculate the load Fig.
A crowbar 4 m long has its fulcrum 50 cm from one end. What minimum effort is required to displace a weight of 500 kgf? Calculate the M.A. of the crowbar.
A faulty balance of unequal arms and pans of unequal weights is used to find the true weight of a metal. By double weighing the weights are found to be 1210 g and 1000 g. Calculate the true weight of the metal.
Fig. shows a spade. It is being used to lift soil weighing 30N from the ground.
(a) Mark the direction of the least force on the handle necessary to keep the spade balanced.
(b) Calculate the least force on the handle necessary to keep the spade balanced (the weight of the spade is negligible).
(c) If the left hand was move towards the soil on the spade, would the force on the handle necessary to keep the soil balance the greater or less? Give a reason for your answer.
(d) To which class of lever does the spade belong?
(a) Mark the direction of the least force on the handle necessary to keep the spade balanced.
(b) Calculate the least force on the handle necessary to keep the spade balanced (the weight of the spade is negligible).
(c) If the left hand was move towards the soil on the spade, would the force on the handle necessary to keep the soil balance the greater or less? Give a reason for your answer.
(d) To which class of lever does the spade belong?
If $60 \%$ of the potential energy available in a waterfall is converted into heat energy, find the height of the waterfall, when the temperature difference between the top and the bottom of the fall is $0.21^{\circ} C$ (sp. Heat cap. Of water $=4200 J / kgK$ ).
View full solution → A lead bullet moving at $70 ms^{-1}$ is brought to rest on hitting a target. If $80 \%$ of its energy is converted into heat energy, find the rise in temperature ( Sp . Heat cap. Of lead is $140 J / kgK$ ).
View full solution → A bullet of mass $25 \ g$ has a velocity of $600 ms^{-1}$. What is the kinetic energy of the bullet? If it penetrates $50 \ cm$ into a target, find the resistive force offered by the target.
View full solution →Which of the following quantity remains constant in a uniform circular motion?
- Aforce
- ✓speed
- Cvelocity
- Dacceleration
Answer: B.
View full solution →Fill in the boxe to show the corresponding energy transformation.
Fill in the boxe to show the corresponding energy transformation.
Fill in the boxe to show the corresponding energy transformation.
Fill in the boxe to show the corresponding energy transformation.
Fill in the boxe to show the corresponding energy transformation.
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