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s2 science test > physics > Flashcards

physics Flashcards

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1
Q

What is a force?

A

A push or a pull

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2
Q

What units are used to measure force?

A

Newtons (N)

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3
Q

What is force measured by?

A

Newton Balance

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4
Q

What direction will an object move when a force is unbalanced?

A

It will move in the direction of the larger force

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5
Q

The larger the unbalanced force…

A

the greater the acceleration

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6
Q

To find total force acting on an object

A

forces acting in the same direction can be added together and forces acting in opposite directions can be subtracted

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7
Q

what is friction?

A

friction is when two surfaces rub together

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8
Q

What does friction always do?

A

opposes motion and slows things down

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9
Q

What increases friction?

A

rough surfaces or surfaces with large surface area

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10
Q

What increases grip?

A

Increasing friction

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11
Q

What is water resistance?

A

When water rubs on a body

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12
Q

What is streamlining?

A

Streamlining is when we change the shape of an object to decrease air or water resistance.

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13
Q

What is air resistance?

A

When air rubs on a body

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14
Q

What also reduces friction?

A

lubrication

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15
Q

What are streamlined objects usually like?

A

Streamlined objects are smooth and curved are smooth and curved and usually close to the ground.

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16
Q

What do cyclists do to reduce friction?

A

They wear skin tight clothing, wear streamlined helmets and bend over their handlebars to reduce friction

17
Q

What do swimmers do to reduce friction?

A

They wear skin tight clothing, shave hair from their arms and legs and wear swimming caps

18
Q

What do FINA state that swimmers must do when swimming?

A

They state that swimmers must break the surface before 15m, because swimming underwater is easier and faster, using less energy

19
Q

What is newton’s third law of motion?

A

Newton’s third law of motion states that for every acting force, there is an equal and opposite reaction force.

20
Q

Give an example of Newton’s third law

A

In swimming, we push water backwards, and the water pushes us forward.

21
Q

What are the four main types/strokes of swimming?

A

Freestyle, breaststroke, backstroke and butterfly

22
Q

how do parachutes work?

A

Parachutes have a large surface area, they increase air resistance and slow things down.

23
Q

What is an object called when it is kicked or thrown?

A

a projectile.

24
Q

What is the name of the curved path a projectile follows?

A

a trajectory.

25
Q

Do all objects fall to earth at the same rate?

A

yes, regardless of their mass due to the pull of gravity.

26
Q

What is vertical motion caused by?

A

It is caused by gravity.

27
Q

When does vertical motion increase?

A

When gravity is present.

28
Q

When does horizontal motion decrease?

A

When air resistance is present.

29
Q

What is the range of a projectile?

A

It is the horizontal distance.

30
Q

What is horizontal distance affected by?

A

the force of the kick and the angle.

31
Q

How do you measure speed in m/s?

A

measure the distance travelled in one second.

32
Q

How to you calculate the speed in m/s

A

Calculate distance divided by time.

33
Q

What units are used in a distance/time calculation?

A

meters/second (m/s)

34
Q

What is reaction time?

A

Reaction time is the time between a stimulus (something happening) and a muscular response (the body doing something).

35
Q

When we see a stimulus, how does this lead to our muscles moving?

A

We see the stimulus with our eyes. The eyes send a message to the visual cortex in the brain. The brain then sends a message to our motor cortex. The motor cortex sends a message to the spinal cord, which sends a message to make the muscles move.

36
Q

Give an example of when reaction time is important.

A

in sports (like racing) reaction time is important because of the small margins between winning and losing.

s2 science test (4 decks)

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