Pratice Questions Flashcards
What is at the centre of the solar system?
The sun
Why did people years ago think that the earth was at the centre?
As the didn’t have a telescope they saw the sun with their eyes and saw it moving around the earth and assumed they where in the middle
Why do we have day and night?
As the earth rotates on its axis the sun shines on different parts of the earth. Making it light and dark
What makes a day 24 hours?
As this is the time it takes for the earth to fully rotate once on its axis
What makes a year 365 days long?
This is the time it takes for the earth to orbit around the sun once
Name a planet with a longer year then earth?
Saturn and mars
And the other planets after the Earth
Why are the stars in May different from the stars in December?
As the earth orbits the sun you see stars from different directions
What three things about an object can a force change?
Speed, direction and shape
Name three forces acting in the room, and one that doesn’t?
Weight, air resistance and friction
Upthrust is not acting in the room
What is Newton’s 1st law of motion?
When an object is at rest it stays at rest and when an object is in motion it will stay in motion at a constant speed unless an unbalanced force is acted upon it
A box has a 5N force acting on it pushing it to the left and a 4N force acting on t pushing to the right. Calculate the resultant force?
1N to the left
The forces on the box are moved, now both forces act downwards. What is the new resultant force?
5N left
4N right
9N downward
Why are racing cars flat and smooth?
Because the streamlining of the car should be smooth so the air resistance and friction is not strong or acting upon it
If I want to reflect infra-red radiation when I go outside, what colour should my coat be?
Shiny, smooth and white
Removing the air from inside something creates a vacuum. Why is this hard to do in a lab?
Because there is air in the lab
