Physics Y09 Spr1

Question 1

1 What is the radius of an atom?

Answer 1

1 × 10-10 m

Question 2

2 What are the three subatomic particles?

Answer 2

protons and neutrons (inside the nucleus) and electrons orbiting around the nucleus.

Question 3

3 What is an isotope?

Answer 3

isotopes have the same number of protons but different numbers of neutrons.

Question 4

4 What is the plum pudding model?

Answer 4

an early model of the atom where the atom is a ball of positive charge with negative electrons embedded in it.

Question 5

5 Who discovered the neutron?

Answer 5

James Chadwick.

Question 6

6 What is a scalar?

Answer 6

a quantity with magnitude (size) but no direction

Question 7

7 What is a vector?

Answer 7

a quantity with magnitude (size) and direction

Question 8

8 What is a contact force?

Answer 8

a contact force is a force that needs to touch to act.

Question 9

9 What is a non-contact force?

Answer 9

A non-contact force is a force that does not need to touch to act.

Question 10

10 Give 6 examples of contact forces.

Answer 10

friction, air resistance, tension (elastic) and normal reaction, upthrust, thrust

Question 11

11 Give three examples of non-contact forces.

Answer 11

gravitational (weight), electrostatic and magnetic

Question 12

12 What is the equation for weight?

Answer 12

W = m × g

Question 13

13 What is a resultant force?

Answer 13

a single force that has the same effect as all forces acting together

Question 14

14 What is work done?

Answer 14

it is an energy transfer.

Question 15

15 What is the equation for work done?

Answer 15

W = F × s

Question 16

16 What does work done against frictional forces cause?

Answer 16

a rise in temperature of the object.

Question 17

17 What is the equation for Hooke’s law

Answer 17

F = k × e

Question 18

18 What is the relationship between the force applied and the extension of an elastic object.

Answer 18

The extension of an elastic object is directly proportional to the force applied.

Question 19

19 What does a wave transfer?

Answer 19

A wave transfers energy from one place to another.

Question 20

20 What is the definition of a transverse wave?

Answer 20

The vibration causing a transverse wave is perpendicular to the direction of travel of the wave.

Question 21

21 What is the definition of a longitudinal wave?

Answer 21

The vibration causing a longitudinal wave is parallel to the direction of travel of the wave.

Question 22

22 What is the amplitude?

Answer 22

The amplitude is the maximum displacement of a wave from its equilibrium position.

Question 23

23 What is the wavelength?

Answer 23

The wavelength is the distance from a point on one wave to the same point on the next wave.

Question 24

24 What is the frequency?

Answer 24

The frequency is the number of waves passing a point each second.