GROWTH DEVELOPMENT CHILD
FORMATIVE ASSESSMENT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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by a net force in the direction of its motion.
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forces that are balanced
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by at least three forces.
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by a net force in the direction opposite of motion.
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Detailed explanation-1: -What force acts on the box to slow it down? This force is called friction. Friction is an external force that acts opposite to the direction of motion (see Figure 4.3). Think of friction as a resistance to motion that slows things down.
Detailed explanation-2: -When an object moves with a certain velocity then it slows down. the net force will change its direction to become in the opposite direction of the motion to stop the object.
Detailed explanation-3: -Friction is the force that acts to resist sliding between two surfaces that are touching. It can slow down or stop the motion of an object. The slowing force of friction always acts in the direction opposite to the force causing the motion.
Detailed explanation-4: -If the net force applied on an object is opposite to the direction of its motion, its speed decreases. For example, the speed of a ball throws upwards decreases until it reaches the highest point. Here, direction of motion is upwards and gravitational force is downwards.
Detailed explanation-5: -But an object that is slowing down is also accelerating. Remember that acceleration is a change in speed. A car that is slowing down is decreasing its speed. It is also accelerating, because its speed is changing.