PHY

Question 1

Displacement

Answer 1

the change in position of an object

Question 2

Acceleration

Answer 2

the rate of change of speed

Question 3

Speed

Answer 3

A rate of change of distance

Question 4

Mass vs. weight

Answer 4

Mass is the amount of matter that makes up an object whereas weight is the force which gravity pulls something towards the earth

Question 5

Newton’s Laws of Motion

Answer 5

Law of inertia: every body remains in a state of rest or uniform motion unless acted upon by a net external force.

Force = mass x gravity: The amount of acceleration of a body is proportional to the acting force and inversely proportional to the mass of the body.

Law of action and reaction: For every action there is an equal but opposite reaction. If an object A exerts a force on object B, then object B will exert an equal but opposite force on object A.

Question 6

Force

Answer 6

a push, pull or twist

Question 7

Friction

Answer 7

the force that opposes motion

Question 8

Pressure

Answer 8

a measure of force applied to a particular area

Question 9

Work

Answer 9

the energy transferred to or from an object via the application of a force along a displacement

Question 10

Power

Answer 10

the amount energy transferred per unit time

Question 11

Kinetic energy

Answer 11

the energy an object has due to its motion

Question 12

Air resistance

Answer 12

the result of collisions of the objects leading surface with air molecules

Question 13

Terminal velocity

Answer 13

highest constant speed an object reaches when falling through the air

Question 14

Gravitational potential energy

Answer 14

the potential energy an object has because of its height

Question 15

Conductor

Answer 15

Materials that allow the electrical flow of charge

Question 16

Insulator

Answer 16

materials that do not allow the flow of electrical charge

Question 17

Voltage in a series circuit

Answer 17

Shared for the components connected to the series

Question 18

Current in a series circuit

Answer 18

Same for components connected in a series

Question 19

Total resistance in a series circuit

Answer 19

All individual resistances added up

Question 20

Voltage in a parallel circuit

Answer 20

Same for all components connected in a parallel

Question 21

Current in a parallel circuit

Answer 21

All individual current added up

Question 22

Total resistance in a parallel circuit

Answer 22

All individual resistance added up (1/Rp = 1/R1 + 1/R2 + R/3)

Question 23

Voltage

Answer 23

the difference in electrical potential energy between two points in a circuit

Question 24

Current

Answer 24

The rate of flow of electrical charge

Question 25

Resistance

Answer 25

The force that opposes the flow of electrical current in a circuit

Question 26

Electric Field

Answer 26

a region in which a charged object experiences a force

Question 27

Electrostatic forces

Answer 27

forces between charged particles causes movement between these charge particles

Question 28

What does a curved line in a distance-time graph represent?

Answer 28

Accelerating/Decelerating

Question 29

What does a positive straight line in a distance-time graph represent?

Answer 29

Constant speed

Question 30

What does a horizontal line in a distance-time graph represent?

Answer 30

Stationary

Question 31

What does a positive straight line in a displacement-time graph represent?

Answer 31

Steady speed

Question 32

What does a horizontal line in a displacement-time graph represent?

Answer 32

Stationary

Question 33

What does a negative straight line in a displacement-time graph represent?

Answer 33

Steady speed returning to start

Question 34

What does a displacement-time graph show

Answer 34

If an object is moving backwards to forwards

Question 35

What does a positive straight line on a speed-time graph represent?

Answer 35

Constant positive acceleration

Question 36

What does a horizontal line on a speed-time graph represent?

Answer 36

Constant speed

Question 37

What does a negative straight line on a speed time graph represent?

Answer 37

Constant negative acceleration

Question 38

What does a curved line on a speed-time graph represent?

Answer 38

Accelerating/decelerating

Question 39

How do you calculate distance travelled on a speed-time graph?

Answer 39

Find area

Question 40

Describe the relationship between area and pressure

Answer 40

If the surface area is increased, the pressure on the snow decreases. If surface area is decreased, the pressure on the snow increases.

Question 41

Why is it that smaller surface area = more pressure? (vice versa)

Answer 41

The same force (weight of object) is applied over a smaller area.

Question 42

Law of conservation

Answer 42

Energy can not be created or destroyed but can be transformed

Question 43

Factors that affect resistance

Answer 43

Length, thickness and temperature

Question 44

Explain the forces of attraction of a positive and negative charge referring to electric field

Answer 44

The positive charge inside an electric field will experience a force towards the negative charge.

Question 45

Describe how we can differentiate the positive and negative parallel plates in a battery.

Answer 45

Longer line - positive Shorter line - negative

Question 46

What way do the arrows point when drawing electrical field between parallel plates?

Answer 46

Away from positive Positive --> Negative

Question 47

How do you calculate strength of the electric field?

Answer 47

Electric field = Voltage / distance between plates

Question 48

What is the unit for electric field?

Answer 48

V/m-1

Question 49

Why is the force needed less when dragging an object up a ramp instead of lifting it straight up?

Answer 49

The force needed is less for the ramp as the work done is the same , but the distance the work is done over is greater therefore force vert is greater than force ramp. (W = F x d)

Question 50

Explain whether or not the power needed to drag an object is more or less than the power needed to lift the object straight up

Answer 50

The power to drag to the top of the ramp would be less than lifting straight up as it took longer to drag up. This means the same work is done but is shared over a greater period of time, so the power is reduced. (P = W / t)