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State Newton's First Law of Motion in words - NSC Technical Sciences - Question 2 - 2020 - Paper 1
Question 2
State Newton's First Law of Motion in words. What is the magnitude of the frictional force experienced by sled? The combined mass of the boy and the sled is now in... show full transcript
Worked Solution & Example Answer:State Newton's First Law of Motion in words - NSC Technical Sciences - Question 2 - 2020 - Paper 1
Step 1
State Newton's First Law of Motion in words.
Answer
Newton's First Law of Motion states that an object continues in a state of rest or uniform motion unless acted upon by a net (resultant) force. This law emphasizes the principle of inertia, which means an object will not change its motion unless a force does work on it.
Step 2
What is the magnitude of the frictional force experienced by sled?
Answer
Given that the sled is moving at a constant velocity, the net force acting on it must be zero. The applied force by the brother is 80 N at an angle of 40° to the horizontal. The horizontal component of this force can be calculated as follows:
Calculating:
F_{x} = 80 imes 0.766 = 61.28 ext{ N} $$ Since the sled is moving at a constant velocity, the frictional force ($f_k$) must equal this horizontal force: $$ f_k = 61.28 ext{ N} $$. Hence, the magnitude of the frictional force experienced by the sled is approximately 61.28 N.Step 3
Define inertia.
Answer
Inertia is defined as the property or tendency of an object to resist any change in its state of rest or motion. This implies that an object at rest will stay at rest, and an object in motion will continue to move at a constant velocity unless acted upon by an external force.
Step 4