Physics Y09 Spr1 Flashcards
1 What is the radius of an atom?
1 × 10-10 m
2 What are the three subatomic particles?
protons and neutrons (inside the nucleus) and electrons orbiting around the nucleus.
3 What is an isotope?
isotopes have the same number of protons but different numbers of neutrons.
4 What is the plum pudding model?
an early model of the atom where the atom is a ball of positive charge with negative electrons embedded in it.
5 Who discovered the neutron?
James Chadwick.
6 What is a scalar?
a quantity with magnitude (size) but no direction
7 What is a vector?
a quantity with magnitude (size) and direction
8 What is a contact force?
a contact force is a force that needs to touch to act.
9 What is a non-contact force?
A non-contact force is a force that does not need to touch to act.
10 Give 6 examples of contact forces.
friction, air resistance, tension (elastic) and normal reaction, upthrust, thrust
11 Give three examples of non-contact forces.
gravitational (weight), electrostatic and magnetic
12 What is the equation for weight?
W = m × g
13 What is a resultant force?
a single force that has the same effect as all forces acting together
14 What is work done?
it is an energy transfer.
15 What is the equation for work done?
W = F × s
16 What does work done against frictional forces cause?
a rise in temperature of the object.
17 What is the equation for Hooke’s law
F = k × e
18 What is the relationship between the force applied and the extension of an elastic object.
The extension of an elastic object is directly proportional to the force applied.
19 What does a wave transfer?
A wave transfers energy from one place to another.
20 What is the definition of a transverse wave?
The vibration causing a transverse wave is perpendicular to the direction of travel of the wave.
21 What is the definition of a longitudinal wave?
The vibration causing a longitudinal wave is parallel to the direction of travel of the wave.
22 What is the amplitude?
The amplitude is the maximum displacement of a wave from its equilibrium position.
23 What is the wavelength?
The wavelength is the distance from a point on one wave to the same point on the next wave.
24 What is the frequency?
The frequency is the number of waves passing a point each second.
