Linear Motion & Force

Question 1

What is Vector

Answer 1

A object that has magnitude, units, and direction

Eg. Position, Velocity, Acceleration

Question 2

What is Scalar

Answer 2

An object that only has magnitude and units

Eg. Time, Speed, Distance

Question 3

How Do Arrows Work With Vectors

Answer 3

Arrow = Direction

Length = Magnitude

Question 4

How To Add Vectors

Answer 4

“nose-to-tail” Method: Add tail of one vector to nose of another vector

“Parallelogram” Method: Construct parallelogram of vectors, then draw vector at intersection = Resultant vector

Question 5

How to Subtract Vectors

Answer 5

Add the opposite of the second vector to the first vector

Question 6

What are Vector Components

Answer 6

Two vectors that add to give original vector

Break up the vector into 2 perpendicular components

Question 7

What is straight line on Distance-Time graph

Answer 7

Distance constant

Speed is 0

Question 8

What is a line with positive gradient on Distance-Time graph

Answer 8

Distance changing
Constant speed

Question 9

What is gradient of line on Distance-Time graph

Answer 9

Speed

Question 10

What is the gradient of a Displacement-Time graph

Answer 10

Velocity

Question 11

What is a line with positive gradient on Displace-Time graph above x-axis

Answer 11

Displacement changing
Velocity constant

Question 12

What is a line with positive gradient on Displacement-Time graph below x-axis

Answer 12

Displacement changing (Negative)
Velocity constant

Question 13

What is a curve on a Displacement-Time graph above x-axis

Answer 13

Displacement changing
Velocity changing

Question 14

What is the area under the line on a Displacement-Time graph

Answer 14

Distance travelled

Question 15

What is the area under the line on a Velocity-Time graph

Answer 15

Displacement

Question 16

What is the gradient of a line on a Velocity-Time graph

Answer 16

Acceleration

Question 17

What is the area under the line on a Acceleration-Time graph

Answer 17

Change in velocity

Question 18

What is the area under the line on a Force-Displacement graph

Answer 18

Work Done (J)

Question 19

What is Distance

Answer 19

‘How much ground an object has covered’ during motion

Scalar quantity

Question 20

What is Displacement

Answer 20

‘How far out of place an object is’

Object’s overall change in position

Vector quantity

Question 21

What is Speed

Answer 21

How fast an object is moving
Rate at which distance travelled is changing

Scalar quantity

Question 22

What is Instantaneous Speed

Answer 22

Speed at particular instant of time

Question 23

What is Average Speed

Answer 23

Average speed over period of time

Question 24

What is formula for Average Speed

Answer 24

Average Speed = Distance / Time

Question 25

When is average speed and instantaneous speed the same

Answer 25

Same when object is moving in constant motion

Question 26

What is the formula for change in speed

Answer 26

Change in Speed = (Final Speed) - (Initial Speed)

Question 27

What is Velocity

Answer 27

What direction and how fast an object is moving Rate at which displacement changes Vector quantity

Question 28

What is Instantaneous Velocity

Answer 28

Velocity at particular instant in time

Question 29

What is Average Velocity

Answer 29

Average velocity over a period of time

Question 30

When is instantaneous velocity and average velocity the same

Answer 30

Same when object is moving in constant motion

Question 31

What is formula for change in velocity

Answer 31

Change in Velocity = (Final Velocity) - (Initial Velocity)

Question 32

What is Vertical Motion

Answer 32

Object thrown into air, reaches point where it stops then returns back down Acceleration Due to Gravity = 9.8 ms-2 down

Question 33

What is Acceleration

Answer 33

Measure of how quickly velocity changes Vector quantity

Question 34

What is formula for average acceleration

Answer 34

Acceleration ms-2 = [ (Final Velocity ms-1) - (Initial Velocity ms-1) ] / (Time s)

Question 35

What are the steps to solve motion problems

Answer 35

1) Draw simple diagram 2) Identify & Write down information given 3) Find unknowns 4) Select equation that best matches data 5) Include units in answer, specify directions if needed