Physics

Question 1

What is current and what is its unit of measurement?

Answer 1

Current measures the rate electrons flow past a point. Measured in amps (A)

Question 2

What is voltage and what is it measured in?

Answer 2

Voltage is the difference in energy between 2 parts of a circuit. Measured in volts (V)

Question 3

How does current act in a series circuit?

Answer 3

Current stays the same all the way around

Question 4

How does voltage act in a series circuit?

Answer 4

Voltage is shared around the circuit and adds up to the voltage of the power supply.

Question 5

How does current behave in a parallel circuit

Answer 5

Current is shared between each branch

Question 6

How does voltage behave in a parallel circuit?

Answer 6

Voltage stays the same on each branch

Question 7

What is ohms law?

Answer 7

V=IR
Voltage=current (times) resistance
(V). (A). (Ohms)
Electric current is directly proportional to voltage

Question 8

How do you calculate the weight of an object using its mass and the value of g=10

Answer 8

W=mg

Question 9

What is a lever?

Answer 9

A simple machine which uses a pivot

Question 10

How do you calculate a moment?

Answer 10

Moment=force (times) perpendicular distance
Nm. N. M

Question 11

How do you make it easier to carry a mass?

Answer 11

Hold it the furthest away possible from the pivot because less effort is needed that way

Question 12

What can forces do to an object

Answer 12

Change the shape of an object
Change the direction of an object
Change the speed of an object

Question 13

What else can force do?

Answer 13

It can compress an object or stretch it

Question 14

What is hooke’s law?

Answer 14

Force=spring constant (times) extension
N. N/cm. cm.

Question 15

What is a elastic material

Answer 15

An elastic object is one that when the load is removed, it returns to its original shape

Question 16

How do you calculate density?

Answer 16

Density=mass
Volume

Question 17

What is density measured in?

Answer 17

Kg/m3 OR G/cm3

Question 18

What is heat transfer

Answer 18

The flow of heat energy from hot to cold areas

Question 19

What is conduction?

Answer 19

The transfer of heat particles between different solids

Question 20

How does heat transfer work in terms of conduction?

Answer 20

Heat transfers from one solid to the other by neighbouring particles colliding into one another

Question 21

How does heat transfer work in terms of convection?

Answer 21

Heat passes from one liquid to gas, vis versa

1)particles gain energy
2)so they move faster
3)so they spread out
4)so they are less dense
5)so they float up

Question 22

How do you describe heat transfer in terms of radiation?

Answer 22

Energy is transferred by electromagnetic waves

Radiation has 2 possible outcomes it can be absorbed or reflected

Question 23

How does evaporation work?

Answer 23

When it gets slightly hot the water particles expand, spreading out, and then rising up making the water ‘disappear’ into the atmosphere

Question 24

How does heat transfer work in terms of radiation?

Answer 24

It occurs via electromagnetic waves