⭐️topic SP1 - Motion

Question 1

What does the speed of an object tell you?

Answer 1

How quickly it travels a certain distance

Question 2

What are the units for speed?

Answer 2

Meters per second - m/s

Question 3

What is the formula for speed?

Answer 3

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

Question 4

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

Answer 4

By using light gates rather than a stopwatch

Question 5

What is the typical walking speed?

Answer 5

1.4 m/s

Question 6

What is the typical motorway speed limit?

Answer 6

31 m/s

Question 7

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

Answer 7

The object is stationary

Question 8

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

Answer 8

The object is travelling at a constant speed

Question 9

How do you calculate speed on a distance time graph?

Answer 9

By calculating the gradient of the line

Question 10

What is acceleration?

Answer 10

A measure of how fast velocity is changing

Question 11

What is a vector?

Answer 11

A quantity with a size and direction

Question 12

What is a scalar?

Answer 12

A quantity with just a size

Question 13

Give examples of a vector

Answer 13

Velocity, weight, displacement, acceleration and momentum

Question 14

Give examples of a scalar

Answer 14

Distance, speed, energy, mass

Question 15

What is displacement?

Answer 15

Distance covered in a straight line and has a direction

Question 16

Why is displacement usually less than distance travelled?

Answer 16

As there are no bends or turns in the journey

Question 17

What is velocity?

Answer 17

The speed in a particular direction

Question 18

When is an objecting accelerating?

Answer 18

If it’s changing velocity or direction

Question 19

What are units of acceleration?

Answer 19

Meters per second squared - m/s^2

Question 20

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

Answer 20

Each second, the velocity increases by 10 m/s

Question 21

What is the formula for acceleration?

Answer 21

a = (v - u )/ t

Where v is final velocity u is initial velocity and t is the time taken for the velocity to change

Question 22

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

Answer 22

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

Question 23

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

Answer 23

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

Question 24

What is the acceleration due to gravity?

Answer 24

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

Question 25

What can a velocity time graph show?

Answer 25

The changing velocity of an object

Question 26

On a velocity time graph:

What does a horizontal line mean?

Answer 26

Object is travelling at a constant velocity

Question 27

On a velocity time graph:

What does a sloping line mean?

Answer 27

The object is accelerating

Question 28

On a velocity time graph:

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

Answer 28

The object is decelerating

Question 29

On a velocity time graph:

How do you find the acceleration of an object?

Answer 29

From the gradient of the line

Question 30

On a velocity time graph:

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

Answer 30

The object is moving in the opposite direction

Question 31

On a velocity time graph:

How do you know the distance travelled by an object?

Answer 31

By calculating the area under the velocity time graph