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Year 7 Science > Forces test > Flashcards

Forces test Flashcards

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1
Q

what is the name of the equipment used to measure force

A

Newton Metre

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2
Q

What is the force between shoes and the ground?

A

Friction

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3
Q

What is a force

A

A push, pull or twist that acts between two objects

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4
Q

What can forces change?

A

Speed
Direction
Shape

of an object

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5
Q

When demonstrating forces, what does the length of arrow tell you?

A

The size of the force

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6
Q

In a diagram of forces, what does the bigger arrow mean?

A

The greater force

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7
Q

What is mass?

A

Mass is how much material an object has

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8
Q

What is weight?

A

The force due to gravity pulling on an object’s mass

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9
Q

What is the effect of mass on an object

A

The more mass an object has the more gravity pulls on it, making it weigh more

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10
Q

What are forces measured in

A

Newtons

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11
Q

What is mass measaured in

A

Kilograms

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12
Q

What is weight measured in and why?

A

newtons. Because weight is a force.

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13
Q

What is the equation for weight

A

weight = mass x gravity (field strength)

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14
Q

what is Earth’s gravitational field strength

A

10 newtons/kg

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15
Q

True or false weight stays the same but mass changes

A

False. Mass stays the same bit weight changes depending on gravitational field strength

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16
Q

Give an example of an unbalanced force

A

A game of tug of war where there are two people on one side and only one on the other.

17
Q

Name the forces acting on a moving car

A

air resistance
friction
weight
drive
reaction

18
Q

Name the forces acting on an aeroplane

A

life
drag
thrust

19
Q

Name the forces acting on a boat

A

weight
thrust
drag
buoyancy

20
Q

Name the forces acting on a skydiver

A

gravity
air resitance

21
Q

What is terminal velocity

A

it is the fastest speed you can fall at

22
Q

How is terminal velocity reached?

A

Terminal velocity is reached when an object’s weight is equal to its drag as it falls through the air

23
Q

What is work done. What is the equation

A

work done is the energy transfered when a force acts over a distance.

Equation: work done = force x distance

24
Q

What is work done measured in

A

joules

25
Q

What is power

A

power is the rate at which energy is transfered OR the rate at which work is done over time

26
Q

What is power measured in

A

Watts

27
Q

What is a turning effect

A

turning effects are forces that cause an object to turn or rotate, these are called moments of forces or ‘moments’.

28
Q

When do turning effects arise. Give an example

A

turning effects occur when a force acts along a lever arm at some distance from a pivot point. E.g. a mechanic turning a spanner.

29
Q

What is the calculation for moments

A

moments = force x distance from pivot

30
Q

What unit are moments measured in

A

Newton Meters

Year 7 Science (5 decks)

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