1. When an object is thrown vertically upward, the value of gravitational acceleration is:
A. -10 ms⁻²
B. -20 ms⁻²
C. +10 ms⁻²
D. +20 ms⁻²
2. Which of the following is correct?
A. 2gs = v_f² + v_i²
B. 2S = v_f² - v_i²
C. 2gs = v_f² - v_i²
D. None of these
3. Motion is always considered along a:
A. Curved line
B. Opposite line
C. Straight line
D. Same line
Answer (2)
For the questions asked, the answers are: 1) A. -10 m/s², 2) B. 2S = v_f² - v_i², and 3) C. Straight line. These conclusions are based on fundamental principles of physics regarding motion and acceleration due to gravity.
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When answering the questions about gravitational acceleration and equations of motion, let's break them down one by one:
Gravitational Acceleration:
When an object is thrown vertically upward, it is moving against the force of gravity. The gravitational acceleration near the surface of the Earth is approximately − 9.8 m/s 2 . In many physics problems, this is approximated to − 10 m/s 2 for simplicity. The negative sign indicates that gravity acts downward, opposite to the upward direction of the object's motion.
Therefore, the correct answer is (A) -10 ms⁻² .
Equation of Motion:
One of the equations of motion that relates the final velocity v f , initial velocity v i , acceleration g , and displacement s is:
v f 2 = v i 2 + 2 a s
In the context of vertical motion under gravity, this can be written as:
v f 2 = v i 2 + 2 ( − g ) s
Rearranging gives:
2 g s = v i 2 − v f 2
Hence, the correct option is (C) 2gs = v_f² - v_i² .
Motion Perspective:
The question on motion pertains to analyzing motion in various directions. Typically, in physics, motion is considered in a straight line as it simplifies calculations and analysis. Even when dealing with projectiles or circular motion, breaking it down into linear components is common.
Thus, the correct answer is (C) Straight line .
Each of these questions relates to the basic principles of kinematics, a foundational topic in physics that deals with the motion of objects. Understanding these principles helps in solving a wide range of problems related to motion, enabling predictions about an object's position and velocity over time.
