Physics

Question 1

How Do Rockets Work?

Answer 1

Air is pumped into the rocket.
When the rocket is launched, the pressurised air forces the water out of the bottom of the rocket. The water leaving the rocket causes a reaction force which pushes it in the opposite direction.

Question 2

Forces can - ?

Answer 2

Change the speed of an object
Change the shape of an object
Change the direction an object travels in

Question 3

The force of gravity 1

Answer 3

Mass is how much ‘stuff ‘ (partials, molecules, atoms etc

Question 4

The force of gravity 2

Answer 4

Mass is measured in kilograms (kg)

Question 5

The force of gravity 3

Answer 5

Any object with mass exerts a force of gravity

Question 6

The force of gravity 4

Answer 6

Gravity is a force that pulls objects towards each other

Question 7

The force of gravity 5

Answer 7

The size of the force depends on the mass of the objects

Question 8

Mass And Weight 1

Answer 8

The weight of an object is a measure of the pull of gravity on the object

Question 9

Mass And Weight 2

Answer 9

Weight is a force

Question 10

Mass And Weight 3

Answer 10

Weight is measured in Newtons (N)

Question 11

Mass And Weight 4

Answer 11

Weight is NOT measured in kilograms, grams, stones, pounds, ounces etc

Question 12

Mass And Weight W = mxg 1

Answer 12

Weight is a downward force caused by mass multiplied by gravitational pull

Question 13

Mass And Weight W = mxg 2

Answer 13

Our weight can be different depending on the gravity of the planet we are on

Question 14

Mass And Weight (again)

Answer 14

When an object is suspended in water, the water pushes upwards and exerts a force on the object
the weight of the object is now:
weight [water] = weight {air} - upwards force