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Questions and Answers
Which physical quantity has both magnitude and direction?
What is the unit of acceleration?
If an object is slowing down, what type of acceleration is it experiencing?
What is the difference between speed and velocity?
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What is the term for the shortest distance between two points?
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Study Notes
Kinematics
- Study of motion of objects, bodies, and systems
Physical Quantities
- Scalar quantities: have magnitude only
- Examples: time, distance
- Vector quantities: have magnitude and direction
- Examples: displacement, velocity, acceleration
Distance and Displacement
- Distance: length covered by a moving object
- Scalar quantity
- S.I. unit: metre (m)
- Displacement: shortest distance between two points
- Vector quantity
- Negative and positive signs indicate direction (left or right, up or down)
- Displacement is distance with direction
- S.I. unit: metre (m)
Speed and Velocity
- Speed: rate of change of distance / distance travelled per unit time
- Scalar quantity
- S.I. unit: metre per second (m/s)
- Average speed = total distance / total time
- Velocity: rate of change of displacement / displacement per unit time
- Vector quantity
- S.I. unit: metre per second (m/s)
- Average velocity = total displacement / total time
Acceleration
- Acceleration: rate of change of velocity / velocity per unit time
- Vector quantity
- S.I. unit: metre per second2 (m/s2)
- Equation: a = Δv / Δt = (v - u) / t
- Deceleration is negative acceleration (slowing down)
- Solving acceleration questions:
- Step 1: List out variables/quantities
- Take note of key words such as ‘from rest’, ‘deceleration’, ‘to rest’
- Step 2: Apply the formula to solve for the unknown
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Description
This quiz covers the basics of kinematics, including physical quantities, scalar and vector quantities, distance, displacement, velocity, and acceleration. Learn about the concepts and units of measurement in kinematics.
