Science - Forces Flashcards
What happpens when two gears are connected?
They always turn in the opposite direction to each other.
Why do fish have a streamlined shape?
It helps them swim faster and for longer distances and it helps them conserve energy by reducing the amount of force required to move through water.
Fill in the gaps: Earth’s gravitational pull causes an object to pull towards the _______centre. _________pulls things to the centre of the Earth.___________ is thought to have developed his theory of gravity when he saw an ___________fall to the ground from an apple tree.
Earth’s gravitational pull causes an object to pull towards the Earth’s centre. Gravity pulls things to the centre of the Earth. Isaac Newton is thought to have developed his theory of gravity when he saw an apple fall to the ground from an apple tree.
How do parachutes work?
Parachutes work by capturing air resistance as they fall, which slows them down by creating drag. This helps objects attached to them, like people or cargo, descend safely to the ground.
Who is Isaac Newton?
Isaac Newton is famously thought to have developed his theory of gravity when he saw an apple fall to the ground from an apple tree.
Newton’s work showed how gravity controls the motion of the planets around the sun as well as the motion of the moon.
What is friction?
A force that acts between two surfaces or objects that are moving, or trying to move, across each other.
What is water resistance?
A type of friction caused by water pushing against any moving object.
What can Gears and cogs be used for?
They can be used to change the speed, force or direction of a motion. When two gears are connected, they always turn in the opposite direction to each other.
What are levers?
Levers can be used to make a small force lift a heavier load. A lever always rests on a pivot.
Forces can make an object…
-stop moving
-moves faster
-move more slowly
-change its shape
-change direction
start to move
