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### Upper Elementary Science - II4.12 Force

 Force is that which changes or tends to change the state of rest or motion of a body. There are usually several forces acting on an object. The forces might: change the speed of a moving object change the direction of a moving object change the shape of an object Here are some forces that act in nature: Air resistance: When an object moves through the air, air resistance acts in the opposite direction to the motion. Air resistance depends on the shape of the object and its speed. Contact force: Contact force happens when two objects are pushed together. Friction: The force which resists movement between two surfaces which are in contact. Gravity: The force which pulls objects towards the Earth. We call the pull of gravity on an object its weight. Directions: Answer the following questions.
 Q 1: Buoyancy in water is an example of FrictionWeightGravity Q 2: When you walk on the ground, the ground exerts a force upwards as you push your feet down. This is ______.frictionweightcontact forcegravity Q 3: When you roll a toy car on a carpet, it comes to a stop because of _______.frictionair resistancegravity Q 4: Name the force acting on a kite that is flyingAir resistanceGravityContact forceFriction Q 5: The weight of an object is the pull of gravity on it.FalseTrue Q 6: Water resistance is an example ofFrictionWeightGravity Question 7: This question is available to subscribers only! Question 8: This question is available to subscribers only!