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Questions and Answers
What is the SI unit of luminous intensity?
What is the SI unit of luminous intensity?
Which of the following is not a derived physical quantity?
Which of the following is not a derived physical quantity?
What will the numbers 2.745 and 2.735 round to when expressed with three significant figures?
What will the numbers 2.745 and 2.735 round to when expressed with three significant figures?
What does the speedometer of a vehicle measure?
What does the speedometer of a vehicle measure?
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What is the slope of a velocity-time graph?
What is the slope of a velocity-time graph?
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Study Notes
Physical Quantities and Units
- SI unit of luminous intensity: Candela
- Derived physical quantity: A physical quantity that can be expressed in terms of fundamental physical quantities
- Fundamental physical quantity: A physical quantity that cannot be defined in terms of other physical quantities
Significant Figures
- Rounding off: The process of reducing the number of digits in a number while keeping its value as close to the original as possible.
- Significant figures represent the reliable digits in a measurement.
Motion and Kinematics
- Velocity-time graph: A graph plotting velocity against time.
- Slope of a velocity-time graph represents acceleration.
- Instantaneous speed: The speed of an object at a particular moment in time.
Vectors and Scalars
- Equal vectors: Two vectors are equal if they have the same magnitude and direction.
- Angle between two equal vectors: 0°
Projectile Motion
- Projectile motion: The motion of an object projected with an initial velocity and then subjected to only the force of gravity
- Horizontal range: The horizontal distance traveled by a projectile.
- Doubling the initial speed: Doubles the horizontal range, keeping the angle of projection constant.
Elasticity
- Elasticity: The ability of a material to regain its original shape after the deforming force is removed.
- Steel: More elastic than rubber.
- Deforming force: A force that causes a material to deform.
Stress
- Stress: Force per unit area acting on a material.
- Dimension formula of stress: $ML^{-1}T^{-2}$
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Description
Explore the fundamental concepts of physical quantities, units, significant figures, and kinematics. This quiz covers important topics such as SI units, motion graphs, and the differences between vectors and scalars. Test your understanding of projectile motion and the principles governing motion in physics.
