Science revision Flashcards
What is the law of Inertia
An object will remain at rest or in uniform motion in a straight line unless acted on by an external force
What is the definition of force?
A push or pull
How does a force act on an object
Go and stop
Accelerate and decelerate
Change shape
Example of a force that speeds up an objects motion
Acceleration in a car
What is the definition of mass
Mass is the amount of matter in a substance
What are some examples of friction in everyday life
Driving Writing Running Walking Holding a pen
Why is friction necessary when kicking a ball.
Without friction, your foot would slip off the ball you wouldn’t be able to kick it
Which direction will this thing move and what is the net force?
12N5N
It will move right
Net force= 7N
What is weight?
Weight is the force of gravity pulling an object down.
How can you tell that the person won’t fall off the chair in the old diagram?
The arrows are the same size and the chair isn’t broken
How do you reduce friction.
Make the surface smoother.
Put detergent on the ground
Put the object on wheels
How do you increase friction?
Make the surface more rough and bumpy
Example of a force that changes an objects direction
Tennis racket hitting a ball.
What are two unwanted side effects of friction in machines
Heat
Wastes energy
Wearing away
Identify the two surfaces that are in contact when you swim at the beach
Water and body
