H n o i t s e u

H : n o i t s e u Q y r i u ? Inq n o i t a v o n in Define forces and give the units used to measure forces Bronze o t d e t a l e r ces r o f l a atur n e r a ow Give examples of forces in every day life Silver Describe whether forces are balanced or unbalanced Gold

Forces

What is a force? FORCES

What is a force? A PUSH OR A PULL OR A TWIST IN A CERTAIN DIRECTION

Pushing When you ride a bike: PUSH the pedal down to make the bike move

Pulling When you drop something, it is PULLED to the ground by gravity

HOW COULD FORCES AFFECT THIS RUBBER BALL?

How do forces affect objects? 1. Start moving

How do forces affect objects? 2. Move faster

How do forces affect objects? 3. Move slower

How do forces affect objects? 4. Stop moving

How do forces affect objects? 5. Change direction

How do forces affect objects? 6. Change shape

H : n o i t s e u Q y r i u ? Inq n o i t a v o n in Define forces and give the units used to measure forces Bronze o t d e t a l e r ces r o f l a atur n e r a ow Give examples of forces in every day life Silver Describe whether forces are balanced or unbalanced Gold

What units do we use forces? The Newton (N) 1. When and where did Newton live? 2. What are Newton’s 3 laws of motion? NEWTON

Force Meter or Newton Meter Measures how large a force is

Measuring forces Measurement Lift pencil case Pull a tripod across the desk Lift your school bag Lift your water bottle option Force (N)

Forces

Balanced forces

Showing forces We cannot see forces, but we can see the effects of the force. We show the direction of the force as arrows.

Representing Forces The direction of the arrow shows the direction of the force The length of the arrow shows the size of the force

If the table suddenly vanished, the book would fall to the floor. This is known as an unbalanced force. The force pulling the book down is greater than the force pushing it up.

Complete Unbalanced forces sheet

The car is not moving. The same forces are acting on it that were acting on the book. GRAVITY REACTION FORCE

What would happen if the car started to move forwards really fast? GRAVITY THRUST AIR RESISTANC REACTION FORCE

MISCONCEPTION ALERT! If a car is travelling at a CONSTANT SPEED – the forces are balanced so arrows should be the same size.

MISCONCEPTION ALERT! If a car is SPEEDING UP – the forces are unbalanced so the arrows are different sizes.

MISCONCEPTION ALERT! If a car is SLOWING DOWN – the forces are unbalanced so the arrows are different sizes.

MISCONCEPTION ALERT! CONSTANT SPEED AGAIN = forces are balanced

Add in arrows onto your diagrams

Forces Videos In your groups on your tables – create a video to show: - 2 unbalanced forces You have today, - 2 balanced forces and the double on On any object in the room you can find! Tuesday to do this. You can cut out arrows to help you. Here are some key words to help you Balanced Unbalanced Speeding up Level ladders will be on your tables to help you Constant speed include all the Slowing down information you need to reach your targets Class will view them on Wednesday and then go through tests Videos should be approx 3 mins

Dropping heavy objects simultaneously Parachutes Friction Pushing boxes forces acting Spring balance weighing Newtons Law Magnets Magnetic shield Magnetic materials Compasses working around the earth Cars and heights of ramps Imporatnce of repeats

Types of forces Gravitational Friction Tension Force applied to an object by a person or object An object attracts another objects towards itself Attraction or repulsion that arises between electrically charged particles because of their motion Normal Supporting force of a stable object that is in contact with something Air resistance Exerted by a surface as an object moves across it Applied Acts on objects moving through the air Spring Magnetic Force transmitted through a string, rope, cable or wire when pulled tight by forces acting from opposite ends Exerted by a compressed or stretched spring on any object attached to it

Contact or Non-contact? Indicate on your forces if you think they are contact or non-contact forces?