⭐️topic SP1 - Motion Flashcards Preview

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Flashcards in ⭐️topic SP1 - Motion Deck (31)
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1

What does the speed of an object tell you?

How quickly it travels a certain distance

2

What are the units for speed?

Meters per second - m/s

3

What is the formula for speed?

Speed (m/s)= distance (m) / time (s)

4

How can you measure the speed of a fast object accurately in the lab?

By using light gates rather than a stopwatch

5

What is the typical walking speed?

1.4 m/s

6

What is the typical motorway speed limit?

31 m/s

7

What does a horizontal line on a distance time graph mean?

The object is stationary

8

What does a sloping straight line on a distance time graph mean?

The object is travelling at a constant speed

9

How do you calculate speed on a distance time graph?

By calculating the gradient of the line

10

What is acceleration?

A measure of how fast velocity is changing

11

What is a vector?

A quantity with a size and direction

12

What is a scalar?

A quantity with just a size

13

Give examples of a vector

Velocity, weight, displacement, acceleration and momentum

14

Give examples of a scalar

Distance, speed, energy, mass

15

What is displacement?

Distance covered in a straight line and has a direction

16

Why is displacement usually less than distance travelled?

As there are no bends or turns in the journey

17

What is velocity?

The speed in a particular direction

18

When is an objecting accelerating?

If it’s changing velocity or direction

19

What are units of acceleration?

Meters per second squared - m/s^2

20

What does an acceleration of 10m/s^2 mean?

Each second, the velocity increases by 10 m/s

21

What is the formula for acceleration?

a = (v - u )/ t
Where v is final velocity u is initial velocity and t is the time taken for the velocity to change

22

What does it mean if an acceleration has a negative value?

Then it’s a deceleration and the object is getting slower

23

How can acceleration be related to initial velocity, final velocity and distance travelled?

v^2 - u^2 = 2ax where x is the distance

24

What is the acceleration due to gravity?

9.8 m/s^2 but is often rounded to 10 m/s^2 in calculations and is represented by symbol g

25

What can a velocity time graph show?

The changing velocity of an object

26

On a velocity time graph:

What does a horizontal line mean?

Object is travelling at a constant velocity

27

On a velocity time graph:

What does a sloping line mean?

The object is accelerating

28

On a velocity time graph:

What does it mean if the line is sloping to the right?

The object is decelerating

29

On a velocity time graph:

How do you find the acceleration of an object?

From the gradient of the line

30

On a velocity time graph:

What does a negative velocity (below the x axis) mean?

The object is moving in the opposite direction