Unit 2 - Motion Flashcards by Charis Diaz

Q

1.2.1 Speed, Distance and Time

What is speed?

A

Speed is the distance travelled per unit time. It is a scalar quantity (no direction).

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Q

1.2.1 Speed, Distance and Time

What is the formula for speed?

A

Speed = Distance ÷ Time

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Q

1.2.1 Speed, Distance and Time

What are the units?

A

Distance → metres (m)
Time → seconds (s)
Speed → metres per second (m/s)

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Q

1.2.1 Speed, Distance and Time

What is average speed?

A

Total distance travelled ÷ Total time taken.

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Q

1.2.1 Speed, Distance and Time

Typical speeds of everyday objects?

A

Walking: 1.5 m/s
Running: 3 m/s
Cycling: 6 m/s
Car: 13–30 m/s
Train: 50 m/s
Aeroplane: 250 m/s
Sound: 330 m/s

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Q

1.2.1 Speed, Distance and Time

How is speed shown on a distance-time graph?

A

The gradient (slope) of the line.

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Q

1.2.1 Speed, Distance and Time

What does a flat (horizontal) line on a distance-time graph mean?

A

The object is stationary.

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Q

1.2.1 Speed, Distance and Time

How to tell if an object is accelerating on a distance-time graph?

A

The slope (gradient) is increasing.

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Q

1.2.1 Speed, Distance and Time

What does a straight line on a distance-time graph represent?

A

Constant speed.

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Q

1.2.2 Velocity Displacement and Time

What is velocity?

A

Velocity is the speed of an object in a given direction.

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Q

1.2.2 Velocity Displacement and Time

Is velocity a scalar or vector quantity?

A

Vector quantity.

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Q

1.2.2 Velocity Displacement and Time

What is the difference between speed and velocity?

A

Speed has no direction, velocity has a specific direction.

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Q

1.2.2 Velocity Displacement and Time

What is the formula for velocity?

A

v = s/t (velocity = displacement / time)

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Q

1.2.2 Velocity Displacement and Time

What are the SI units for velocity?

A

m/s (metres per second)

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Q

1.2.2 Velocity Displacement and Time

What is displacement?

A

The distance in a straight line from the starting point to the ending point, in a specific direction.

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Q

1.2.2 Velocity Displacement and Time

Why is displacement used to calculate velocity instead of distance?

Study These Flashcards

A

Because velocity is a vector quantity and requires direction, which displacement provides.

Q

1.2.2 Velocity Displacement and Time

What is the formula for displacement?

Study These Flashcards

A

d = s × t (displacement = velocity × time)

Q

1.2.2 Velocity Displacement and Time

What is the formula triangle for velocity?

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A

Top: d (displacement), Bottom left: s (velocity), Bottom right: t (time)

Q

1.2.2 Velocity Displacement and Time

A sprinter runs 100 m West in 9.80 s. What is their velocity?

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A

10.2 m/s West

Q

1.2.2 Velocity Displacement and Time

What does the gradient of a distance-time graph represent?

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A

Speed (or velocity if direction is considered)

Q

1.2.2 Velocity Displacement and Time

If an 800 m runner starts and finishes at the same point, what is their velocity?

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A

0 m/s (displacement is zero)

Q

1.2.2 Velocity Displacement and Time

How do you calculate the gradient of a line?

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A

Gradient = Rise / Run

Q

1.2.2 Velocity Displacement and Time

Can two objects have the same speed but different velocities?

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A

Yes, if they are moving in different directions.

Q

1.2.2 Velocity Displacement and Time

What is the velocity equation rearranged to find time?

Study These Flashcards

A

t = d/s (time = displacement / velocity)

1.2.2 Velocity Displacement and Time What is the velocity equation rearranged to find displacement?

d = s × t (displacement = velocity × time)

1.2.2 Velocity Displacement and Time If velocity is 7 m/s South-East for 15 seconds, what is the displacement?

105 m South-East

1.2.2 Velocity Displacement and Time A go-kart has velocity of 15 m/s East and displacement of 375 m East. What is the time?

25 seconds

1.2.2 Velocity Displacement and Time How do you convert km to m?

Multiply by 1000

1.2.2 Velocity Displacement and Time How do you convert minutes to seconds?

Multiply by 60

1.2.2 Velocity Displacement and Time A car travels 100 km North in 50 minutes. What is the velocity?

33.3 m/s North

1.2.2 Velocity Displacement and Time What graph is used to represent an object's motion in a straight line?

Distance-time graph

1.2.2 Velocity Displacement and Time What can be calculated from the gradient of a distance-time graph?

Speed

1.2.2 Velocity Displacement and Time What equation can be used to calculate average speed of objects undergoing non-uniform motion?

v = s/t (velocity = displacement / time)

1.2.2 Velocity Displacement and Time Why must you include direction when stating velocity?

Because velocity is a vector quantity and requires both magnitude and direction.