Can be a push or a pull for example to push a door open you are applying contact force upon it in order for it to move.
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When a force is exerted on an object, it can change the object's?
Speed.Shape.Direction of movement
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What are contact forces?
Where objects have to be touching each other to apply force.
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What are non-contact forces?
Where objects do not have to touch each other to apply force.
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What are forces measured in?
Newtons (N)
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The ------- the force the ------ the number.Complete the sentence.
Greater and Bigger
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What is a balanced force?
When two forces acting on an object are equal in size but act in opposite directions
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If the forces on an object is balanced or there is no force acting on it what happens?
A stationary object will stay still and a moving object will keep moving at the same speed and stay the same shape.
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Can an object still move if there are no forces acting on it?
Yes because it was moving anyway
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What do the arrows show on force diagrams?
The size of the force (the longer the arrow the bigger the force).The direction in which the force acts
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What do you need to draw an arrow on a force diagram?
Ruler and pencil with just a single line as it is more accurate.
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What is an unbalanced force?
When two forces acting on an object aren't equal in size
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What is the overall force acting on an object called?
Resultant force
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If the forces on an object are unbalanced what happens?
A stationary object starts to move in the direction of the resultant force and a moving object changes speed and/or direction in the direction of the resultant force
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The -------the resultant force, the ------- the change in the motion of the object.
Greater, Greater
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What is Friction?
Whenever two objects move against each other it creates frictional forces.
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What does Friction do?
Makes it harder for things to move
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What is air resistance?
Air resistance is caused by the frictional forces of the air against the vehicle. The faster the vehicle moves, the bigger the air resistance becomes.
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Where do we see some useful friction in our everyday lives?
The floor and our shoes (it stops us from slipping).
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Where do we see un-useful friction in our everyday lives?
When you are driving your wheels will start to get old because of the heat that the frictional forces crate between your tires and the floor.
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Card 2
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When a force is exerted on an object, it can change the object's?
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