Topic 5 Forces Flashcards Preview

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Flashcards in Topic 5 Forces Deck (25)
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1
Q

Vectors quantities

A

Have magnitude and direction. Eg force, velocity, displacement, acceleration and momentum

2
Q

Scalar quantities

A

Only have magnitude and no direction. Eg speed, distance, mass, temperature and time

3
Q

Contact force

A

Two objects have to touch for a force to act. Eg friction, air resistance, tension of ropes, normal contact force

4
Q

Non-contact force

A

When the objects don’t need to be touching to act. Eg magnetic force, gravitational force and electrostatic force

5
Q

Newton’s third law

A

When two objects interact the force exerted is equal and opposite on the two objects

6
Q

Gravitational force

A

The force of attraction between masses. It makes all things fall to the ground. And gives everything weight

7
Q

Mass

A

The amount of stuff in an object. Not a force. Measured in kilograms

8
Q

Weight

A

The force acting on an object due to gravity. Weight is higher for objects that have higher masses. It is a force that is measured in Newton’s

9
Q

The relationship of mass and weight

A

They are directly proportional

10
Q

Free body diagrams

A

It describes the forces acting on an object the sizes of the arrows show the relative magnitude of the forces and the directions they are going

11
Q

Resultant force

A

The overall force on a point or object. So the result of two forces pushing against each other

12
Q

Word done to an object

A

When a force moves an object through a distance energy is transferred and work is done on the object

13
Q

Scale drawing

A

They find resultant forces.

14
Q

Equilibrium

A

When forces are balanced

15
Q

Stretching, compressing and bending

A

When more than one force acts on an object.

16
Q

Elastically deformed

A

When a force is applied to something and it returns to its original shape and length

17
Q

Inelastically deformed

A

When a force is exerted on an object causing it stay in a certain position and length

18
Q

What is the relationship between extension to force

A

They are directly proportional

19
Q

What happens if you continue to extend the spring

A

Eventually extension will increase but force will not and it has reached maximum force

20
Q

Moment

A

The turning effect of a force. The longer the distance from the pivot and the more energy exerted means a higher moment

21
Q

Levers

A

Make it easier to do work. Since moment = force x distance if the moment stays the same and the distance increases the force must decrease

22
Q

Gears

A

Gears interlock and turn in the opposite direction. Transmit the rotational effect of the force. Different sized gears change the moment so larger gear will cause a bigger moment. Larger gears will turn slower

23
Q

Pressure

A

The force per unit area. The particles move around exert a force on the object

24
Q

Pressure in liquids

A

Depends on depth and density. The more dense a liquid is the more particles it has so will collide and have a higher pressure. As the depth increases the number of particles above increases so the pressure increases

25
Q

Upthrust of objects in fluid

A

High