Forces When you ride a bike, your foot pushes against the pedal. The push makes the wheels of the bike move.
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1 CHAPTER: FORCE AND PRESSURE WORKSHEET NO 5 Forces When you ride a bike, your foot pushes against the pedal. The push makes the wheels of the bike move. When you drop something, it is pulled to the ground by gravity. A PUSH or a PULL is a FORCE. So, a good definition for force is a push or pull in a particular direction. Forces affect how objects move. They may cause motion; they may also slow, stop, or change the direction of motion of an object that is already moving. Forces can affect motion in several ways: They can make objects start moving They can make objects move faster They can make objects move slower They can make objects stop moving They can make objects change direction They can make objects change shape Since force cause changes in the speed or direction of an object, we can say that forces cause changes in velocity, so. Forces cause acceleration FORCE FACTS: Forces are measured in Newtons (N) Forces usually act in pairs Forces act in a particular direction Forces usually cannot be seen, but their effects can be felt.
2 CHAPTER: FORCE AND PRESSURE WORKSHEET NO 6 1. Define the term force. Give its S.I. unit. Force Ex: 2. Give three examples of; a. Force as a pull: i. ii. iii. b. Force as a push: i. ii. iii. 3. Stretch and squeeze are also types of forces. Give two examples of; a. Stretch as a force; i. ii. b. Squeeze as a force; i. ii.
3 4. Identify the type of forces (indicated by arrows) in the following figures from the given list: Drag force, spring force, buoyant force, friction force, centripetal force, magnetic force, gravity, applied force
4 CHAPTER: FORCE AND PRESSURE WORKSHEET NO 8 1. Match the example to the correct type of force:
5 2. Fill in the blanks: a. Force is a or a. b. Force has and direction. c. force always opposes motion. d. Frictional forces between a pair of surfaces depends upon their and. e. Pressure is the force acting area. f. In M.K.S system, the unit of pressure is. g. Internationally the accepted unit of pressure is. h. Magnetic force is. i. The pressure is ratio of and. j. We apply oil to machines to friction. 3. Give reasons for the folloeing: 1. Animals like camel walk easily in deserts. 2. A heavy truck is fitted with 6 to 8 wheels. 3. When a carom board becomes old, we apply powder to it. 4. Differentiate between: a. Thrust and pressure b. Force and pressure c. Gravitational force and frictional force
6 CHAPTER: FORCE AND PRESSURE WORKSHEET NO Match the example to the correct type of force:
7 2. A force of 243 newton acts on an area of 27m 2. Find the pressure in pascals. 3. Find the magnitude of force required by an area of 200cm 2 to produce a pressure of Pa on it. 4. What is the area of the surface of a body, if it exerts a force of 100 newton to produce a pressure of 1000 Pa? 5. Two boys pull each other with a force of 200 newton. What is the resultant force?
8 CHAPTER: FORCE AND PRESSURE WORKSHEET NO 9 1. If Ravi pulls a cart by applying force 300 newton and Deepak pulls with a force of 200 newton. What will be the net resultant force. 2. An elephant weighing 40,000 newton stands on one foot of area 1000 m 2 (=1/10 m 2 ). What pressure is exerted on the ground? 3. What is the pressure exerted by a girl weighing 400 newton standing on one `stiletto` heel of area 1cm 2 (=1/10,000 m 2 )?
9 4. Compare the answers of question 2 and 3, which exerts more pressure per unit volume and why? Explain. 5. What is the magnitude of force required in newtons to produce a pressure of Pa on an area of 100 cm 2? 6. A force of 100 newton can produce a pressure of 100,000 Pa. Calculate the area in cm 2 on which the force acts.
10 CHAPTER: WORK AND ENERGY WORKSHEET NO 11 a. Fill in the blanks: a. Capacity of doing work is called. b. The unit of work is. c. Work done is when displacement is not taking place. d. The energy possessed by a stretched rubber band is called. e. A weight lifter uses to move heavy weights up. f. A kite flying in the air has energy. g. The energy of sun reaches us through a series of conversions called. b. Match the words in column A with that in column B. ColoumnA ColoumnB a. Electricity is a i. Kinetic energy b. More energy is required ii. Converted into another form c. Energy possessed due to iii. Ability to do work motion d. Energy is iv. Mechanical energy e. One form of energy can be v. Form of energy f. Unit of work vi. Fundamental source of energy g. Potential energy is a form of vii. To do more work h. Solar energy viii Joule c. In a cracker which kind of energy is a. Stored: b. Required for ignition:
11 c. Given out during explosion: 4. Give at least two examples of the following types of energy: a. Mechanical energy; b. The energy Chemical energy: c. Sound energy; d. Light energy: e. Heat energy: 5. Find the amount of work done, if a force of 13 newton is applied on a body and the body moves through a distance of 27m. 6. The work done in moving a body through a distance of 5m is 100 joules. What is the value of force applied? 7. A force of 10 newton applied on a body moves it through a certain distance. The work done in this situation is 150 joules. What is the displacement of the body?
12 CHAPTER: MACHINES WORKSHEET NO List the six simple machines, their principles and uses. Draw a sketch of each one. Machine Drawing Principle (how it works) Examples of Use 2. Simple Machine Vocabulary: Define the following concepts about simple machines. Effort Load Fulcrum Mechanical Advantage Efficiency
13 CHAPTER: MACHINES 1. Define simple machines? WORKSHEET NO Define lever. State its principle. 3. Explain the principle of lever. 4. State the mathematical expression for mechanical advantage of lever. 5. Define the different types of lever with appropriate examples.
14 CHAPTER: MACHINES WORKSHEET NO Define and draw the different types of lever with appropriate examples. Lever of First Order: examples: Lever of Second Order:
15 examples: Lever of Third Order with examples examples:
16 CHAPTER: MACHINES WORKSHEET NO Define pulley. State its types. 2. Cite examples of pulleys used in daily life. 3. Draw single and movable pulley.
17 CHAPTER: MACHINES WORKSHEET NO Define inclined plane and give examples of inclined plane used in daily life. 2. Define screw. 3. Define wedge and give two examples of wedge used in daily life. 4. Define wheel and axle.
18 CHAPTER: MACHINES 1. Scissors WORKSHEET NO 18 a) List two types of simple machines used in scissors: b) Label the fulcrum, the point of effort application, and one possible point of load application on the drawing to the right. 2. Adjustable wrench a) List two types of simple machines used in an adjustable wrench: Mechanical advantage: 3. Can opener Pitch a) List three types of simple machines used in the can opener:
19 4. Corkscrew a) List three types of simple machines found on a corkscrew: b) What is the pitch of the screw? 5. Roller Blades a) What is the purpose of a single pulley? b) How many pulleys are there on the skate at your station? c) Name another type of simple machine on the skate.
20 CHAPTER: MAGNETISM WORKSHEET NO 19 Q1. Which of these objects is most likely to be attracted to a magnet? Q2. Two magnets when brought together, repel (push) each other. Which of these possibly explains why this happens? A. One of the magnets is heavier than the other. B. North pole of both the magnets are facing each other. C. North pole of one magnet is facing the south pole of the other magnet. Q3. Which of these was one of the uses of magnets in olden days? A. providing heat B. checking speed C. measuring time D. finding directions Q4. At which of the regions of the magnet is the magnetic pull the weakest? A. the North pole only B. the South pole only C. centre, between the two poles D. both, the North and the South pole Q5. A freely suspended bar magnet, when comes to rest, aligns in the of the Earth. A. north-south B. east-west C. north-north D. south-south Q6. State whether the statement is true or false. Correct if false. a. A magnet attracts all metals. b. A bar magnet can never have just one pole. It will always have two poles. c. Hammering destroys the magnetic property of magnets. d. Cutting a magnet into two pieces destroys its magnetic properties. e. Heating a magnet will increase its magnetic property. f. Magnetite is a natural magnet. g. Rubber is a magnetic material.
21 CHAPTER: MAGNETISM WORKSHEET NO Define magnetic and non- magnetic substances with examples. 2. Enumerate and draw the types of magnets. 3. State the properties of magnets. 4. State the different methods of making a magnet.
22 CHAPTER: MAGNETISM 1. Explain the Induction method. WORKSHEET NO Explain the Double touch method. 3. Why is Magnetic force at the poles maximum. 4. What is the Directive property of a magnet? 5. Magnetic poles always occur in pairs. 6. State the uses of magnets.
23 CHAPTER: MAGNETISM WORKSHEET NO 22 Fill in the blanks: 1) Two magnets when arranged as shown above, will each other. 2) A pole of a magnet will be attracted to the South pole of another magnet. 3) When two magnets are brought closer to each other, there might be attraction or repulsion. For each combination of poles below, fill whether there will be attraction or repulsion. North-North North-South South-North South-South 4) Two magnets, close to each other, with their south poles facing each other will each other. 5) Materials which get attracted towards magnet are known as materials. 6) Maximum iron fillings get stuck to the of the bar magnet. (centre/poles) Answer in one word: 1) How many poles does a bar magnet have? 2) Name a non-magnetic metal. 3) Direction in which a suspended bar magnet points when at rest.
24 CHAPTER: MAGNETISM WORKSHEET NO 23 1) Classify the following materials as magnetic and non-magnetic: plastic bottle, paper cup, glass rod, steel spoon, woolen sweater, iron lock, chalk stick, gold bangle, Key, Wood, Glass, Chalk, Pencil, Nail, Cup of tea, Book, Geometry box, Rubber, Needle, Fork MAGNETIC NON-MAGNETIC 2) Vibha spread some iron fillings and put a magnet on top of them. The iron fillings got stuck to the magnet and looked as shown below. Why did the iron fillings get attracted to the magnet and make this pattern? Why did they not stick all over the magnet? 3) List 3 things by doing which, magnets may lose their property.
25 4) Why is it advisable to keep magnets away from a watch or a cassette? 5) When paper clips are put on a paper and a magnet below the paper, the clips are still attracted to the magnet. Does this mean that the paper is magnetic? 6) List 4 non-magnetic substances. 7) When do two magnets attract and repel each other? 8) Name two metals other than iron that a magnet attracts.
26 Name Date Do The Research! Simple Machines Directions: Research the topic indicated to the right and answer the questions below based on that topic. Topic: Simple Machines 1.What is a simple machine? 2. Why do we use simple machines? 3. Name six simple machines.
27 1. How to study Physics? Physics, the basic physical science, is fundamental in medicine, science, engineering, and many presentday social problems. The proper mental attitude an earnest desire to learn is the most important requirement for effective study. For most students, physics involves new concepts, about which logical reasoning is necessary. Hence, efforts to memorize physics are worthless. Pay close attention to definitions. Go to class not just to take notes but to learn. Memorize, for convenience only, a few of the most important fundamental formulas and for the other material learn to reason from the fundamental ideas. Complete your daily portion of study; in this way, you study better, remember longer and recall more easily. Think first; don t begin to write until your ideas are clearly in mind. After exams are returned, always review to see where you were weak, and then clear up the deficiency. Study in a place free from distractions. Get adequate sleep, exercise, and recreation, but leave enough time for study. Study regularly, preferably soon after class. 2. How to solve numerical problems? In working problems, it is very important to do the work in an orderly fashion: Read the problem carefully twice. Write down the given and put question mark what to find out. Draw a suitable diagram to support your solution. Write down the correct formula to be used. Substitute the correct values Calculate it accurately and check the units. 3. WHY STUDY PHYSICS? Physics is the basic physical science. It deals with such things as mechanics (force, energy, and motion), sound, heat, light, electricity, and atomic structure. In fact, physics has been described as the science of why things work.
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