Physics yr 7

Question 1

What is a resultant force?

Answer 1

The difference between two unbalanced forces

Question 1

What is a force

Answer 1

A push, pull or a twist

Question 2

How do you calculate weight?

Answer 2

mass x gravitational field strenght

Question 3

What is weight?

Answer 3

A force exerted on another object, caused by gravity

Question 4

What would happen if the earth wasn’t tilted and why?

Answer 4

There would be no seasons and we would have stable temperatures all year round because the tilt of the earth’s axis affects the concentration of sunlight certain places receive ; with no tilt, the earth around the equator would receive a steady concentration of sunlight and be life friendly, while land near the poles would be largely uninhabitable.

Question 5

What is a transverse wave?

Answer 5

a wave in which the vibrations are perpendicular to the direction of wave travel?

Question 6

What is a longitudinal wave?

Answer 6

A wave in which the vibrations are parallel to the direction of wave travel

Question 7

330 m/s

What is the speed of sound in air?

Answer 7

330 m/s

Question 8

What is a current?

Answer 8

A flow or movement of charge (charged particles)

Question 9

What is a magnet?

Answer 9

A material that produces a magnetic field

Question 10

Distance = ?

Answer 10

Speed x Time

Question 11

Speed = ?

Answer 11

Distance ÷ Time

Question 12

Time = ?

Answer 12

Distance ÷ Speed

Question 13

What are electrons?

Answer 13

1. positively charged subatomic particles
2. attracted to protons

Question 14

What are protons?

Answer 14

1. negatively charged subatomic particles
2. attracted to electrons

Question 15

What is current?

Answer 15

A flow or movement of charge (charged particles)

Question 16

Conduction

Answer 16

atoms vibrating when heated, colliding with neighbouring atoms, making them vibrate

Question 17

Convection

Answer 17

cool air sinking, travelling along, getting heated, then rising