Physics
Physics
LO: to be able to describe the differences between balanced and unbalanced forces
FORCES
A force is a push, pull or twist that can change an objects motion
Force is measured using a unit called newtons(N)
Force can begin to move, speed up/ accelerate, slow down/decelerate or stop, change direction, change shape, remain still.
BALANCED FORCE
Balanced force is a force that are equal in size but opposite in direction
Do not cause change in motion
Gravitation force- pulls down but we don’t have to touch it
UNBALANCED FORCE
Unbalanced forces are forces that cause change in motion of an object
e.g., speeding up on a bike, slowing down on a bike.
Motion always occurs in the direction of change.
CONTACT AND NON-CONTACT FORCE
LO: To be able to describe between contact and non-contact
Non-contact forces:
Forces that act at a distance from objects
e.g. gravitational force- pulls down but we don’t have to touch it
Contact forces
Contact forces occurs when force that acts when 2 surfaces touch
Contact forces can act on an object in many ways.
e.g. applied force- on object directly pushes against another
Frictional force- tires on the road
Air resistance- drag, elastic forced
INVESTIGATING MAGNETIC FEILDING
LO: To investigate which materials a magnetic field can pass through and which materials will block it
MAGNETIC FORCES
The attraction or repulsion force on an object caused by a buildup of negative forces
ELECTROSTATIC FORCES
The force between two objects caused by a build-up of negative charges
ELECTROSTAIC FORCES
LO: to explain what an electrostatic and provide examples by completing an expert group activity
What are electrostatic forces?
An invisible force between things that have an electric charge
CONTACT FORCES- FRICTION-
LO: to investigate how different surfaces effects the size of friction
Contact forces are a force that acts between two objects that touch or are in contact.
e.g. picking up a pencil, Turing a doorknob.
HOW TO MEAURE FORCES
We measure forces using a device called a newton meter of spring balance
AIR RESISTANCE AND FRICTION
LO: 1. Define air resistance
Identify examples of air resistance
Air resistance: is a resistive force, (opposite direction to the motor) due to air that acts between air and moving forces.
Type of friction
Contact force
Happens in fluids, water, gases
GRAVITY
LO: To be able to define & outline differences between gravity mass and weight
Keywords:
- Gravity- force that pulls an object toward the centre of any mass or the force that pulls objects to the centre of the Earth.
the heavier the object, the stronger gravitational pull it will have.
-Mass- how many particles or atoms make up an object
the mass would be the same anywhere, mass is measured in grams/ kilograms.
-Weight- a measure of how much gravity is pulling on an object.
It will be different if the force of the gravity changes, it is measured in newtons.
NET- FORCES
Learning objective: To review balanced & unbalanced forces and represent net forces
Mental set:
Force: A push, pull or a twist that can change and objects motion. E.g. stop, starting. Motion changing direction.
Newtons are used to measure forces
A spring balanced is used
Balanced forces: Forces that are equal in size but opposite in direction
Unbalanced forces: Forces that can change in the motion of an object because the forces are not equal in size.
Net- force: The term net force refers to the sum of all forces acting on an object.
To calculate net forces you must:
Add forces going in the same direction
Subtract forces going in opposite direction (larger force subtract the smaller force)
Free body diagrams 25.7.2025
Learning objective: To be able to calculate net forces and draw free body diagrams.
WHAT ARE THE 6 EFFECTS OF FORCE
The 6 effects of force are:
Making a stationary object move
Changing the speed of a moving object (accelerating/ decelerating)
Stopping a moving object
Changing the direction of a moving object
Changing the shape or size of an object
Transferring energy