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Questions and Answers
Which physical quantity has both magnitude and direction?
Which physical quantity has both magnitude and direction?
- Displacement (correct)
- Time
- Distance
- Speed
What is the unit of acceleration?
What is the unit of acceleration?
- Metre squared per second (m^2/s)
- Metre per second cubed (m/s^3)
- Metre per second (m/s)
- Metre per second squared (m/s^2) (correct)
If an object is slowing down, what type of acceleration is it experiencing?
If an object is slowing down, what type of acceleration is it experiencing?
- Uniform acceleration
- Negative acceleration (correct)
- Zero acceleration
- Positive acceleration
What is the difference between speed and velocity?
What is the difference between speed and velocity?
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What is the term for the shortest distance between two points?
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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