Page 131 - Knowledge Organiser Yr7 24-25

Knowledge Base: Science 7.6 Forces Year 7
1. Forces and their Effects
1.18
Draw a free body diagram to show the forces acting on a book on a table:
normal contact force
weight
1.19
Draw a free body diagram to show a skier skiing down a hill (from top left of the page to bottom left of the page):
weight
normal contact force
friction and air resistance
1.20
Draw a free body diagram to show a boat accelerating (getting faster and faster):
upthrust
air resistance
driving force
weight
1. Forces and their Effects
1.1 What is a force?
1.2 What is the unit of forces?
1.3 Which scientific instrument is used to measure forces?
A push or a pull. Newton (N). Newton meters.
1.4
When a force acts on an object it can cause the object to change in what ways?
Speed, direction or shape.
1.5
What is a contact force?
Forces acting when two objects a re touching .
1.6
What is a non-contact force?
Forces acting when objects aren't touching.
1.7
Name five contact forces.
Friction, air resistance, upthrust, normal contact force, driving forces.
1.8 Name two non-contact forces.
Gravity, magnetism.
1.9
What is the name of the force that resists motion due to two interlocking surfaces?
Friction.
1.10
What is the name of the force that exists when objects collide with air particles?
Air resistance.
1.11
What is the name of the force that exists which causes an object in a liquid or gas to be pushed up?
Upthrust.
1.12
What is the name of the force that acts at right angles to the surface that an object is touching?
Normal contact force.
1.13
What is the name of the force that causes an object to move in a set direction?
Driving force.
1.14
What is the name of the attractive force that acts between two masses?
Gravity.
1.15
What is weight?
A force that acts on an object due to gravity.
1.16 What is the name of the force that acts between magnets?
1.17 What does the arrow in a force diagram represent?
Magnetic force.
Size and direction of a force.
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