P9. Motion

Question 1

What is the equation for speed?

Answer 1

Speed = distance / time

Question 2

What is speed the symbol equation?

Answer 2

v = s/t

Question 3

What is speed an example of?

Answer 3

A scalar quantity

Question 4

Why is speed a scalar quantity?

Answer 4

Speed is a scalar quantity because it doesn’t involve direction.

Question 5

What is the normal walking speed?

Answer 5

1.5 m/s

Question 6

What is the normal running speed?

Answer 6

3 m/s

Question 7

What is the normal cycling speed?

Answer 7

6 m/s

Question 8

What is the normal speed of a car on a main road?

Answer 8

13 m/s

Question 9

What is the normal speed of a fast train in UK?

Answer 9

50 m/s

Question 10

What is the normal speed for a cruising aeroplane?

Answer 10

250 m/s

Question 11

What is the normal speed of sound in air?

Answer 11

330 m/s

Question 12

What does distance travelled equal to?

Answer 12

Distance = speed x time

Question 13

What is velocity?

Answer 13

The velocity of an object is its speed in a given direction.

Question 14

What is velocity an example of?

Answer 14

Vector quantity

Question 15

What is velocity in terms of a circle?

Answer 15

If an object moves at a constant speed in a CIRCLE then its velocity is constantly changing even though its speed is constant.

Question 16

What does the special rule of velocity and moving around a circle also apply to?

Answer 16

This also includes an object moving around part of a circle, like moving around a corner

Question 17

Watch distance time graph video!!!
(FreeScienceLessons)

Answer 17

👩🏼‍🦲🌌

Question 18

What does the gradient of a distance time graph tell us?

Answer 18

The gradient tells us the objects speed.

Question 19

What does an upward sloping curve show us in a distance time graph?

Answer 19

This tells us that the object is constantly increasing in speed.
ACCELERATING

Question 20

What does the acceleration of an object tell us?

Answer 20

The acceleration tells us the change in its velocity over a given time.

Question 21

What is the equation for acceleration?

Answer 21

Acceleration = change in velocity / time

Question 22

How do calculate change in velocity?

Answer 22

(Final velocity - initial velocity)

Question 23

What does a negative number mean in terms of velocity?

Answer 23

Decelerating

Question 24

How to calculate distance recalled using a velocity time grap when acceleration and deceleration is not constant?

Answer 24

(Curve lines) means you count as may full or almost full squares and then find the area of those

Question 25

What is terminal velocity with skydivers etc?

Answer 25

1) The upwards air resistance is small due to person still not moving very quickly. 2) As they speed up, air resistance increase. Eventually balancing the downwards weight force. 3) Now the skydiver’s acceleration is zero. Meaning they are travelling at a constant speed. This is TERMINAL VELOCITY