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Science End Of Year Test Revison > Forces & Motion > Flashcards

Forces & Motion Flashcards

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1
Q

What can forces change?

A

Change a shape of something, it’s speed or the direction it moves in

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2
Q

What is a contact force?

A

A force where there needs to be contact between objects before the force can have an affect

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3
Q

Example of contact forces

A

Air resistance, water resistance, upthrust and friction

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4
Q

What is a non contact force?

A

A force that can affect something from a distance

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5
Q

Example of non contact forces

A

Gravity, static electricity and magnetism

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6
Q

Where does air resistance react?

A

Against the force of movement

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7
Q

What is extension?

A

The amount by which a spring or other stretchy material has stretched

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8
Q

How do you calculate stretched length?

A

Stretched length subtract (-) original length

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9
Q

What is elastic?

A

An elastic material changes shape when there is a force on it but returns to its original shape once the force is removed

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10
Q

What is limit of proportionality?

A

the extension of a spring is proportional to the force on it up to a certain point

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11
Q

What is hookes law?

A

The law that says the extension of a spring is proportional to the force on it

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12
Q

What are plastic materials?

A

Materials that do not return to their original shape when a force is removed

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13
Q

What material is good to reduce friction?

A

Rubber

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14
Q

What can friction do?

A

Slow things down or make them stay still

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15
Q

What is reducing friction called?

A

Lubricants or lubrication

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16
Q

Examples of lubricants?

A

Oil or grease

17
Q

How can air resistance and water resistance be reduced?

A

By having smooth surfaces and smooth shapes

18
Q

What is pressure?

A

The amount of force pushing on a certain area

19
Q

What is the formula to calculate pressure?

A

Pressure = force/area

20
Q

If forces are unbalanced on a moving object what will happen?

A

It will change it’s speed

21
Q

What do all stationary objects have on them?

A

Balanced forces

22
Q

List different forces

A

Friction, reaction, thrust, gravity, air resistance, water resistance, magnetic force, upthrust, tension, weight

23
Q

Name stores of energy?

A

Kinetic, nuclear, chemical, elastic potential energy, gravitational potential energy, thermal

24
Q

Name energy transfers?

A

Heat, sound, light, force, electricity

25
Q

What is the law of conservation energy

A

energy cannot be created or destroyed it can only be transferred

26
Q

What are the units of force?

A

Newtons

27
Q

What are the units of distance?

A

Metres

28
Q

What is the centre of mass?

A

the centre of mass is the point at which the object will balance. The force of gravity acts through the centre of mass

29
Q

What is another name for turning effect?

A

Moment

30
Q

What is the formula to find out moment?

A

Moment = force x distance from pivot

31
Q

What is the equation for work done?

A

Work done = force x distance in the same direction as force

Science End Of Year Test Revison (2 decks)

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