Forces
What do forces do?
1) Forces explain why bjects move in the way that they do, or why they don't move at all
2) Forces can also change the direction that objects are moving in, and change their shape
How do you measure Newtons?
With a newtonmeter
Name the parts and features of a wave
Amplitude, frequency, wavelength, peak, crest and through
Name the parts of the ear tat make up your outer ear
Pinna, auditory canal and the eardrum
Celia Mae
Name 3 examples of each:
1) Contact forces
2) Non-contact forces
1) Friction, air and water resistance
2) Magnetic forces, Gravity Electrostatic force
What is a force field?
Special region where something experiences a force
How is a sound wave produced?
By a vibration
Decibels (dB)
How long was the first World War?
4 years 1914 to 1918
True or false:
Are forces able to squash/strech objects?
True, forces can compress or stretch objects.
True or false:
Non-contact forces act only if you are near the object
False, non-contact forces act at any distance
Solids, with 5000 m/s in metals like steel
Name the part of your ear that helps you with balance
The semi-circular canals
Which animal is the one that kills the most people in a year?
The mosquito
Mention a way to reduce the friction of a bike chain
Lubrication
Calculate your weight taking as a reference a gravitational field of 10 N/kg
weight (N) = mass (kg) * g (gravitatonal field)
A ___ sound has a bigger amplitude than a ____
loud, soft
How does a microphone work?
The sound wave hits the plate called diaphragm, the diaphragm vibrates like the eardrum and produces an electrical signal, the signal carries the information that the wave carried. You can use an amplfier to make the sound louder.
True or False, babies have more bones than adults
True: Babies have more bones than adults because as they grow up, some of the bones fuse together to form one bone
Mention a way you can use drag forces
Parachutes are used to slow down drag-racing cas and skydivers. The contact with the air produces a drag force
Give an example of an unbalanced force
When you are playng the rope game and in your team they are very strong and in the other very weak
Frequencies below ___ Hz are called infrasound, and frequencies above ___ Hz are called ultrasound.
20 Hz - 20 000 Hz
Tell the process of hearing
The pinna directs the sound wave to your auditoey canal, the eardrum vibrates and makes the oscicles vibrate and the oscicles make your oval window vibrate, passing the vibration on to the liquid of the cochlea. In the cochlea the tiny hairs dance and specialized cells produce electric signals, the electric signals go through the auditory nerve to your brain.
What is the most ancient language of Europe?
Basque (Vasco)