Dynamics

Question 1

What is a scalar quantity

Answer 1

A quantity with magnitude (size) only

Question 2

Examples of scalar quantities

Answer 2

Distance, speed, time, energy, mass

Question 3

What is a vector quantity

Answer 3

A quantity with magnitude and direction

Question 4

Examples of vector quantities

Answer 4

Displacement, velocity, acceleration, force, weight

Question 5

What is Distance

Answer 5

The total path travelled by an object

Question 6

What type of quantity is distance

Answer 6

Scalar

Question 7

What is displacement

Answer 7

The straight line distance from start to finish with direction

Question 8

What type of quantity is displacement

Answer 8

Vector

Question 9

What is speed

Answer 9

Distance travelled per unit of time

Question 10

Formula for speed

Answer 10

V = d/t

Question 11

Units for speed

Answer 11

meters per second m/s

Question 12

Formula for velocity

Answer 12

v = s/t

Question 13

What is velocity

Answer 13

Displacement travelled per unit of time

Question 14

Why is velocity a vector

Answer 14

Because it has a direction

Question 15

Formula for average velocity

Answer 15

V(with a line on top) = s/t

Question 16

What does average velocity use

Answer 16

Total displacement and total time

Question 17

How is instantaneous speed measured in experiments

Answer 17

Using a light gate

Question 18

Formula used with light gates

Answer 18

v = d/t
(D= length of card)

Question 19

What does a velocity time graph show

Answer 19

How velocity changes over time

Question 20

What does the slop (gradient) represent

Answer 20

Acceleration

Question 21

What does a downward slop mean

Answer 21

Deceleration

Question 21

What does a flat line mean

Answer 21

Constant velocity (no acceleration)

Question 22

Units for displacement

Answer 22

Meters (m)

Question 23

What’s is acceleration

Answer 23

The rate of change of velocity

Question 24

Formula for acceleration

Answer 24

a = (v-u) / t

Question 25

Units for acceleration

Answer 25

m/s(squared)

Question 26

What does negative acceleration mean

Answer 26

Deceleration (slowing down)

Question 27

State Newton's first law

Answer 27

If the forces of an object are balanced, it will remain at rest or move at a constant velocity in a straight line

Question 28

What are balanced forces

Answer 28

Equal size forces in opposite directions

Question 29

What happens when forces are balanced

Answer 29

No change in motion

Question 30

What is a force

Answer 30

A push or a pull that can change an object's motion or shape

Question 31

Unit for force

Answer 31

Newton (N)

Question 32

What instrument measures force

Answer 32

Newton balanced (spring balance)

Question 33

What is friction

Answer 33

A force that opposes motion between two surfaces

Question 34

What affects friction

Answer 34

Roughness of surfaces Force pressing surfaces together

Question 35

What is a resultant force

Answer 35

Single force that has the same effect as all forces combined

Question 36

How to calculate resultant force in a straight line

Answer 36

Add forces In the same direction Subtract forces in opposite directions

Question 37

What is a free body diagram

Answer 37

A diagram showing all forces acting on an object

Question 38

Formula for Newton's second law

Answer 38

F=ma

Question 39

What does the Newton's second law show

Answer 39

That Acceleration depends on force and mass

Question 40

Units in Newton's second law formula

Answer 40

F=Newtons M=kilograms A=m/s(squared)

Question 41

Definition of a newton

Answer 41

The force needed to accelerate 1kg at 1m/s(squared)

Question 42

What is mass

Answer 42

Amount of matter in an object (kg)

Question 43

Does mass change on different planets

Answer 43

No

Question 44

What is weight

Answer 44

The force of gravity acting on am object (Newton N)

Question 45

Formula for weight

Answer 45

W=mg

Question 46

What is g (gravitational field strength) on Earth

Answer 46

9.8 m/s(squared)

Question 47

What is free fall

Answer 47

Motion when gravity is the only force acting

Question 48

What is terminal velocity

Answer 48

When weight equals air resistance, so an object falls at a constant speed.

Question 49

Formula for work done

Answer 49

Ew=Fd

Question 50

What is work done

Answer 50

Energy transferred when a force moves an object Unit (Joules)

Question 51

Law of conversion energy

Answer 51

Energy cannot be created or destroyed, only transferred or changed form

Question 52

State Newton's third law

Answer 52

For every action force there is an equal and opposite reaction force

Question 53

What does the gradient of a velocity time graph give

Answer 53

Acceleration

Question 54

What does the area under a velocity time graph give

Answer 54

Displacement

Question 55

What happens when forces are balanced

Answer 55

Constant velocity or rest

Question 56

What causes acceleration

Answer 56

Unbalanced force