Topic 3.4:Temperature and heat

• Science
• Middelbare school
• havo
• Leerjaar 2

Topic 3.4 

Temperature and heat

the arrow of gravitational force is drawn starting at....

1. top of the object
2. centre of mass
3. bottom of the object
4. side of the object

There are 2 Forces working on an object. the resulting force is 0N
What type of motion does the object have?

1. constant speed
2. acceleration
3. deceleration
4. spinning around

Dog A is pulling with a force of 60 N and dog B is pulling in the opposite direction with a force of 75 N
What is the resultant force?

1. 15 Newton to dog A
2. 75 Newton to dog B
3. 60 Newton to dog A
4. 15 Newton to dog B

The unit for speed is

1. s
2. v
3. m/s
4. km/min

v=s/t, so time can be calculated with the following formula

1. t= v/s time = speed / distance
2. t = s/v time = distance /speed
3. t = s x v time = distance * speed
4. t = s + v time = distance + speed

Convert 100 km/h to m/s?

1. 27,8 m/s
2. 360 m/s
3. 103,6 m/s
4. 96,4 m/s

3.4 temperature and heat

Learning goals

1. you can describe the concept of temperature, the different scales it is measured in and the corresponding units

2. you can convert the temperature from Celsius to Kelvin and backwards

3. you can describe the concept of heat and the units it is measured in

4. you can distinguish the difference between temperature and heat

5. you can describe the concept of heat combustion and use it to calculate the amount of energy released during combustion

Heat

Total amount of energy of the molecules that are present in a piece of matter

The bigger the energy, the bigger the heat

Temperature

indication of average amount of kinetic energy (movement) per molecule

Shown in Degrees Celsius

Symbol T

At what temperature does water boil?

1. 0 degrees Celsius
2. 75 degrees Celsius
3. 100 degrees Celsius
4. 150 degrees Celsius

At what temperature does water go from liquid to solid?

1. 10 degrees Celsius
2. -10 degrees Celsius
3. 100 degrees Celsius
4. 0 degrees Celsius

Johanie is at a traffic light. As soon as it hits green, he starts to speed up on his bike. He accelerates with 5 m/s2.
What is his speed after 4 seconds?

1. 9 m/s
2. 1 m/s
3. 20 m/s
4. 1,25 m/s

convert 18 m/s to km/h

1. 14,4 km/h
2. 65 km/h
3. 5 km/h
4. 21,6 km/h

Temperature in Celsius

based on water

0 degrees Celsius , water going from solid to liquid or back

100 degrees Celsius, water going from liquid to gas or back

Temperature in Kelvin

Temperature can also be measured in Kelvin (no degrees)

-273 degrees Celsius = 0 Kelvin

0 degrees Celsius = 273 Kelvin

1 degrees up in Celsius=

1 Kelvin up

How many Kelvin is 75 degrees Celsius

1. -198 Kelvin
2. 0,27 Kelvin
3. 3,64 Kelvin
4. 348 Kelvin

The gravitational force on an object is 440 N, WHat is his mass?

1. about 350 kg
2. about 45 kg
3. about 449,8 kg
4. about 882 kg

Name another unit for temperature

15 degrees Celsius is .....

1. 288 Kelvin
2. 258 Kelvin
3. 4095 Kelvin
4. 18,2 Kelvin

How far did this object travel after 16 seconds?

1. 500 km
2. 1000 km
3. 0 km
4. 300 km

Heat and chemical reactions

exothermic reaction --> heat is released

Heat of combustion

the amount of energy that is released when you burn 1 kg of that type of fuel

Gasoline: 36 . 10^6 J/kg

Wood: 16 . 10^6 J/kg

I want to draw a force with a magnitude of 1200 N.
The scale must be 1 cm = 60 N
How large should the arrow (vector) be?

1. 20 cm
2. 5 cm
3. 10 cm
4. 12 cm

Gasoline has a heat of combustion of 32 MJ/kg
How much energy wil you get by burning 0,5 kg?

1. 64 MJ
2. 32 MJ
3. 16 MJ
4. 32,5 MJ

A car is accelerating for 3 seconds, increasing by 20 m/s every second. What is his final speed?

1. 23 m/s
2. 60 m/s
3. 6,7 m/s
4. 17 m/s

What kind of movement will happen in this situation?

1. constant speed to the left
2. constant speed to the right
3. acceleration to the left
4. acceleration to the right

What kind of movement wil happen here

1. constant speed downwards
2. constant speed upwards
3. deceleration downwards
4. deceleration upwards

On an object the following forces are acting:
50 N to the right
20 N upwards
75 N to the left
20 N downwards
What type of motion will happen?

1. acceleration upwards
2. acceleration to the right
3. acceleration downwards
4. acceleration to the left