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7 k forces and their effects (boardworks)
1.
KS3 Physics 7K Forces
and their Effects 1 of 27 20 © Boardworks Ltd 2004 2006
2.
Contents 7K Forces and
their Effects Feel the force Friction Forces in water Weight and mass Summary activities 1 of 27 20 2 © Boardworks Ltd 2004 2006
3.
What is a
force? A force is a push, pull or twist. A force cannot be seen but you can see how a force affects an object. 1 of 27 20 3 © Boardworks Ltd 2004 2006
4.
Forces activity 1 of
27 20 4 © Boardworks Ltd 2004 2006
5.
When forces are
balanced balanced forces 10 N 10 N If you link two forcemeters and pull equally hard from both ends, the forces recorded on both will be the same. The forces acting on the central hooks cancel each other out – they are equal in magnitude and opposite in direction. Because the forces are balanced the hooks do not move. 1 of 27 20 5 © Boardworks Ltd 2004 2006
6.
When forces are
unbalanced unbalanced forces 10 N 11 N movement What happens if the pull on one end is greater than the pull on the other end? The forces acting on the hooks are no longer balanced. Both hooks will start to move to the left – their speed will change. This is called acceleration. Unbalanced forces lead to a change in speed or direction. 1 of 27 20 6 © Boardworks Ltd 2004 2006
7.
Balanced or unbalanced
forces? 1 of 27 20 7 © Boardworks Ltd 2004 2006
8.
Contents 7K Forces and
their Effects Feel the force Friction Forces in water Weight and mass Summary activities 1 of 27 20 8 © Boardworks Ltd 2004 2006
9.
What is friction? If
you rub your hands together they get warm. There is resistance to the rubbing motion. What is the name of this resistive force called? It is called friction. What causes this force? Your hands might look smooth, but on a microscopic level they have rough surfaces. So when you rub your hands together you feel the resistive force of friction. 1 of 27 20 9 © Boardworks Ltd 2004 2006
10.
More about friction Friction
always tries to slow moving objects down. We say it opposes motion. Friction is created whenever two touching objects or surfaces move past each other. Friction also occurs when things move through air. This is called air resistance or drag. There is a maximum value for the frictional force which depends on: the force pushing the two surfaces together; 1 of 20 10 of 27 the state of the surfaces in contact. © Boardworks Ltd 2004 2006
11.
What are the
sources of friction? Label all sources of friction that can act on this bike. brake pad and rim wheel bearing pedal bearing wheel bearing air resistanceProbably One more? or “drag” the most important… tyre and road 1 of 20 11 of 27 links in chain © Boardworks Ltd 2004 2006
12.
Effect of frictional
forces 1 of 20 12 of 27 © Boardworks Ltd 2004 2006
13.
Contents 7K Forces and
their Effects Feel the force Friction Forces in water Weight and mass Summary activities 1 of 20 13 of 27 © Boardworks Ltd 2004 2006
14.
Forces in water What
is thrust? What is upthrust? The force that pushes an object forward. The force that pushes an object upwards in a liquid or a gas, also called buoyancy. upthrust friction thrust weight 1 of 20 14 of 27 © Boardworks Ltd 2004 2006
15.
Ferry forces 1 of
20 15 of 27 © Boardworks Ltd 2004 2006
16.
Changing forces The ferry
arrives at Calais and is loaded with travellers. What happens to the weight of the ship? increases What happens to the upthrust on the ship? increases Which is the largest force - weight or upthrust? both equal 1 of 20 16 of 27 © Boardworks Ltd 2004 2006
17.
Contents 7K Forces and
their Effects Feel the force Friction Forces in water Weight and mass Summary activities 1 of 20 17 of 27 © Boardworks Ltd 2004 2006
18.
What are mass
and weight? Mass and weight are not the same! Mass is the amount of matter in an object and is measured in kilograms. Mass is not a force. Mass will have the same value anywhere in the Universe, including outer space. Weight is a force and is caused by the pull of gravity acting on a mass. Like other forces, weight is measured in newtons and has both magnitude and direction. Weight has different values depending on where you are in the Universe. 1 of 20 18 of 27 © Boardworks Ltd 2004 2006
19.
Weight and mass
on the Moon The force of gravity is less on the Moon than it is on Earth. This is because the Moon has a smaller mass than the Earth. Any object will weigh less on the Moon than it does on Earth. An astronaut could jump 20 feet into the air on the Moon because gravity is less. However, the astronaut still has the same body and the same mass: he just weighs less because gravity is weaker on the Moon. 1 of 20 19 of 27 © Boardworks Ltd 2004 2006
20.
Talking about weight
and mass A scientist should never say: “She weighs 50 kilograms,” but should always say: “She has a mass of 50 kilograms”. Alternatively, the scientist could say: “The gravitational force acting on her mass is about 500 newtons”. This is the same as saying: “Her weight is about 500 newtons”. 1 of 20 20 of 27 © Boardworks Ltd 2004 2006
21.
Weight and mass
on different planets 1 of 20 21 of 27 © Boardworks Ltd 2004 2006
22.
Weight or mass? 1
of 20 22 of 27 © Boardworks Ltd 2004 2006
23.
Contents 7K Forces and
their Effects Feel the force Friction Forces in water Weight and mass Summary activities 1 of 20 23 of 27 © Boardworks Ltd 2004 2006
24.
Glossary air resistance –
A frictional force that acts against an object moving through air. force – A push or a pull, measured in newtons (N). friction – A force that occurs between two surfaces rubbing against each other. gravity – The force of attraction between two objects. mass – The amount of matter that an object is made of, measured in kilograms (kg). thrust – A force that pushes an object forwards. upthrust – A force that pushes an object upwards. weight – The force caused by gravity acting on an object, measured in newtons (N). 1 of 20 24 of 27 © Boardworks Ltd 2004 2006
25.
Anagrams 1 of 20 25
of 27 © Boardworks Ltd 2004 2006
26.
Missing words 1 of
20 26 of 27 © Boardworks Ltd 2004 2006
27.
Multiple-choice quiz 1 of
20 27 of 27 © Boardworks Ltd 2004 2006
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