Practice Worksheet 1

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  Q1: Multiple choice questions: 1.  What is force? a. pull  b. push c. push and push both d. none of these 2.  What is state of motion? a. position of rest  b. position of motion c. both by the state of rest or motion d. none of these 3.  The strength of force is expressed by? a. weight  b. mass c. magnitude d. longitudinal force 4.  The force between two charged bodies is called a. muscular force  b. gravitational force c. magnetic force d. electrostatic force 5.  When two forces act in opposite directions, then net force acting two forces a. sum of two factors  b. difference bwteen two factors c. both of these d. none of these 6.  Magnetic force is a. contact force  b. non-contact force c. both a and b d. none of these 7.  Force acts on an object may change a. direction  b. shape c. speed d. all of above 8.  Leaves or fruits fall on the ground due to a.magnetic force  b. gravitational force c. electrostatic force   d. muscular force Q2.  Fill in the blanks in the following statements. (a) To draw water from a well we have to ______ at the rope. (b) A charged body______ an uncharged body towards it. (c) To move a loaded trolley we have to ________ it. (d) The north pole of a magnet _____ the north pole of another magnet. 4.  An archer stretches her bow while taking aim at the target. She then releases the arrow, which begins to move towards the target. Based on this information fill up the gaps in the statements using the following terms. Muscular, contact, non-contact, gravity, friction, shape, attraction (a) To stretch the bow, the archer applies a force that causes a change in its ______. (b) The force applied by the archer to stretch the bow is an example of ________ force. (c) The type of force responsible for a change in the state of motion of the arrow is an example of a ______ force. (d) While the arrow moves towards its target, the forces acting on it are due to ____ and that due to  __________ of air. 5.  In the following statements identify the agent exerting the force and object on which its acts. State the effect of the force in each case. (a) Squeezing a piece of lemon between the fingers to extract its juice. (b) Taking out paste from a toothpaste tube. (c) A load suspended from a spring while its other end is on a hook fixed to a wall. (d) An athlete making a high jump to clear the bar at a certain height. 6.  A blacksmith hammers a hot piece of iron while making tool. How does the force due to hammering affect the piece of iron? 7.  An inflated balloon was pressed against a wall after it has been rubbed with a piece of synthetic cloth. It  was found that the balloon sticks to the wall. What force might be responsible for the attraction between the  balloon and the wall? 8.  Name the forces acting on a plastic bucket containing water held above ground level in your hand. Discuss why the forces acting on the bucket do not bring a change in its state of motion. 9.  A rocket has been fired upwards to launch a satellite in its orbits. Name the two forces acting on the rocket immediately after leaving the launching pad.  10.  When we press the bulb of a dropper with its nozzle kept in water, air in the dropper is seen to escape in the form of bubbles. Once we release the pressure on the bulb, water gets filled in the dropper. The rise of  water in the dropper is due to (a) Pressure of water. (b) Gravity of the earth. (c) Shape of rubber bulb. (d) Atmospheric pressure. Q3: Answer in short: 1.  Identify the agent exerting force and the object on which it acts when a piece of lemon is squeezed  between fingers and juice come out. 2.  Explain that force are due to an interaction between objects. 3.  What are the effects of force? 4.  Explain contact and non-contact forces? 5.  Explain the force of gravity? 6.  If the area of head is 15cmX15cm, how much air (in weight) would you carry on your head? 7.  Does the application of force result in change of state of motion of the object. 8.  What do you meant by pressure? How can we increase the pressure by exerting same force? 9.  Give two factors which affect the effect of changes? 10.  How to describe state of motion? 11.  Give two examples each of situations in which you push or pull to change the state of motion of objects. 12.  Give two examples of situations in which applied force causes a change in the shape of an object. Q4: Answer the following questions: 1.  How can we decide whether an object is moving faster than the other. 2.  what is required for a force to come into play? 3.  What happens when two forces act in same direction? 4.  A ball is in rest. When it is pushed, why it starts moving? 5.  What is role of force on the speed of moving object? 6.  Is the gravity a property of earth only? 7.  Does liquids and gases also exert pressure? 8.  What is atmosphere? 9.  How to feel force in daily life? 10.  What is electrostatic force? Why is it called non-contact force? 11.  We observe that the wheels of buses and trucks are heavier than the wheels of car or scooters. Why? 12.  What are the examples of muscular force? 13.  Give two examples of a situation in which applied force causes a change in the shape of an object. 14.  How to change the speed and the direction of a moving body? 15.  What are the efftects of force?   
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