Dynamics In Space

Question 1

What is the definition of “speed”?

Answer 1

The distance travelled per second

Question 2

What is the distance travelled per second?

Answer 2

Speed

Question 3

What is the unit of speed?

Answer 3

ms^-1

Question 4

What is the unit ms^-1 for?

Answer 4

Speed

Question 5

What are the two types of speed?

Answer 5

Average and Instantaneous

Question 6

What is “average speed”?

Answer 6

Speed calculated over a long time interval

Question 7

What do you call speed calculated over a long time interval?

Answer 7

Average speed

Question 8

What is “instantaneous speed”?

Answer 8

Speed at an instant time, calculated over a short period of time?

Question 9

What do you call speed at an instant time?

Answer 9

Instantaneous speed

Question 10

What is the equation for average speed?

Answer 10

v = d / t

Question 11

What two groups can physical quantities be divided into?

Answer 11

Vectors and Scalars

Question 12

What is a “vector”?

Answer 12

A vector is a physical quantity that can be completely described by stating magnitude and direction

Question 13

What physical quantity can be completely described by stating magnitude AND direction?

Answer 13

Vectors

Question 14

What is a “scalar”?

Answer 14

A scalar is a physical quantity that can be completely described by stating it’s magnitude only

Question 15

What is magnitude?

Answer 15

Size

Question 16

What do you call size?

Answer 16

Magnitude

Question 17

Give three examples of a scalar

Answer 17

• Distance
• Speed
• Mass
• Time
• Energy

Question 18

Give three examples of a vector

Answer 18

• Displacement
• Velocity
• Force
• Acceleration

Question 19

What is “velocity”?

Answer 19

Velocity is defined as the displacement of an object per second.

Question 20

What do you call the displacement of an object per second?

Answer 20

Velocity

Question 21

What is “acceleration”?

Answer 21

Acceleration is the change in velocity per second. It’s measured in metres per second per second (ms^-2).

Question 22

What do you call the change in velocity per second?

Answer 22

Acceleration

Question 23

What is the unit for acceleration?

Answer 23

ms^-2

Question 24

What is the unit ms^-2 for?

Answer 24

Acceleration

Question 25

What is the formula for acceleration?

Answer 25

a = v - u / t

Question 26

What is the formula “a = v - u / t” used for?

Answer 26

Acceleration

Question 27

What is a “force”?

Answer 27

A force is a push or a pull.

Question 28

What do you call a push or a pull/

Answer 28

Force

Question 29

What is the only was a force can be detected?

Answer 29

Forces can only be detected by their effects on an object.

Question 30

What can forces change?

Answer 30

Forces can change an object’s;-
• direction
• speed
• shape

Question 31

What is force measured in?

Answer 31

Newtons (N)

Question 32

What is the unit Newtons (N) used for?

Answer 32

Force

Question 33

What is “weight”?

Answer 33

Weight is the downwards gravitational force that acts on a mass

Question 34

What do you call the downwards gravitational force that acts on a mass?

Answer 34

Weight

Question 35

What is “gravitational field strength”?

Answer 35

Gravitational Field Strength is the weight per kilogram of mass.

Question 36

What is the gravitational field strength on Earth?

Answer 36

9.8Nkg^-1

Question 37

What is the equation for weight?

Answer 37

W = m g

Question 38

What is the equation “W = m g” used for?

Answer 38

Weight

Question 39

What is “friction”?

Answer 39

Friction is a resisting force that opposes the motion of an object. It’s caused by 2 objects rubbing together.
• Friction can slow down and/or stop the motion of an object.
• Friction can cause grip.
• Heat is generated from friction