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Science force unit > core questions > Flashcards

core questions Flashcards

1
Q

What is a force

A

A push , pull, twist or turn

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2
Q

What is the unit of force

A

Newtons (N)

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3
Q

What do we call forces that require touch to be felt

A

Contact forces

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4
Q

What do we call forces that act at a distance

A

Non-Contact forces

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5
Q

What is the sum of all the forces acting on an object called

A

Resultant force

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6
Q

What do we say if the forces on an object are balanced

A

The resultant force is zero

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7
Q

What do we call the force that moves an object

A

Thrust

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8
Q

What force acts in the opposite direction to the force applied

A

Reaction force

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9
Q

What force acts in a stretched cable/rope

A

Tension

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10
Q

What is the attractive force that acts between matter called?

A

Gravity

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11
Q

What force acts towards the ground?

A

Weight

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12
Q

What force acts lifting an object upwards in a fluid

A

Upthrust

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13
Q

What force acts in the opposite direction to motion

A

Friction/Air Resistance/Water Resistance/Drag

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14
Q

What is friction

A

A force that acts between surfaces in the opposite direction to motion

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15
Q

What can friction do to an object

A

Slow an object down

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16
Q

What is friction in a fluid

A

Drag/Air Resistance/Water Resistance

17
Q

Where is friction useful

A

Grip between two surfaces/brakes

18
Q

Where is friction not useful

A

Between moving parts in machines/slowing down objects moving in a fluid

19
Q

What is used to reduce friction

A

Lubricants(e.g. oil, graphite)

20
Q

What happens when friction occurs between moving parts?

A

Kinetic energy is transferred to heat and sound energy

21
Q

What is a stationary object

A

An object that is not moving

22
Q

What is speed

A

The distance travelled in a quantity of time

23
Q

What is the equation for calculating speed?

A

speed=distance/time

24
Q

What are the units of speed

A

m/s

25
Q

What is a change of speed

A

Acceleration

26
Q

What happens when there is a resultant force on an object?

A

It will accelerate (speed up or slow down)

27
Q

What happens when there no resultant force on an object?

A

It will remain stationary or remain at a constant speed/velocity

28
Q

How can we represent a journey?

A

On a distance-time graph

Science force unit (1 decks)

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