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Physics > Topic 1 and 2-Motion and forces > Flashcards

Topic 1 and 2-Motion and forces Flashcards

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1
Q

What is the triangle linking acceleration, time and change in velocity?

A
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2
Q

What is newtons first law?

A

A moving object will continue to move at the same speed and direction unless a net external force acts on it. A stationary object will remain at rest unless a net external force acts on it.

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3
Q

What is centripetal force?

A

An object moving in a circle will have a changing velocity despite the speed staying the same. The resultant force acting on the object is called centripetal force and acts towards the centre of the circle.

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4
Q

What is the triangle linking weight, mass and gravitational field strength?

A
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5
Q

What is newtons second law?

A

Acceleration depends on mass and the size of the force.

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6
Q

What is the triangle linking force, mass and acceleration?

A
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7
Q

What is inertial mass?

A

Measure of how difficult it is to change the velocity of an object.

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8
Q

Explain the core practical on investigating acceleration.

A
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9
Q

What is newtons third law?

A

When two objects touch(sitting on a chair or gravitational atraction between the moon and earth), there is a pair of action reaction forces acting in opposite directions with the same size force.

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10
Q

What is momentum?

A

The tendancy of an object to keep moving or how hard it is to stop moving.

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11
Q

What is the triangle linking momentum, mass and velocity?

A
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12
Q

What is the coservation of momentum?

A

After objects collied the total momentum will be the same before and after.

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13
Q

What is stopping distance?

A

thinking distance+braking distance

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14
Q

What is reaction time?

A

The time between a person detecting a stimulus and their response.

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15
Q

What factors can affect braking distance?

A

Condition of tires(if they are worn they will create less friction)

Weather(if there is rain, less friction will be created)

Terrain(if there is loose gravel, less friction will be created)

Mass(the heavier it is the slower it will slow down with the same amount of friction)

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16
Q

What factors affect reaction time?

A

Hydration

Amount of sleep

Age

Music

Alcohol(depressant so will increase reaction time)

Crack(stimulant so will reduce reaction time)

17
Q

Does fog affect stopping distance?

A

No it just reduces the distance at which the hazard can be spotted.

18
Q

What is the equation for kinetic energy?

A
19
Q

What is work done?

A

The energy transferred by a force acting over a distance.

20
Q

What is the triangle linking work done, distance and force?

A
21
Q

What is a crumple zone?

A

Crumple zones are built into the front(sometimes back) of cars. If the car hits something it takes some time for the crumpling to happen so there is less deceleration and therefore less force acting on the car.

22
Q

Complete the sentance-The greater the radius of rotation, the … the centripetal force.

A

Smaller

23
Q

When spinning a hammer, what causes the centripetal force?

A

Tension in the wire.

24
Q

State two features that make it difficult for cars to roll over(F1 car).

A

Wide wheel base and low centre of gravity.

25
Q

Why should radius and mass of object be kept the same when doing an experiment involving centripetal force?

A

Each may also affect the speed si inlt one independent variable.

26
Q

What keeps electrons in orbit?

A

Electrostatic forces.

27
Q

What is power measured in?

A

Joules per second.

28
Q

What is an inelastic collision?

A

Energy is not conserved.

29
Q

Why do two photons have to be produced when electrons and positrons collide?

A

So momentum is conserved and there is a positive and negative momentum.

30
Q

In a vacuum, what do all bodies falling toward’s the earths surface have?

A

The same acceleration.

31
Q

What is the speed of light in vacuum?

A

300,000,000 m/s

32
Q

What is the speed of sound in air?

A

343 m/s

33
Q

What is the average walking and running speeds?

A

1.4 m/s and 5 m/s

34
Q

What is the average cycling and train speed?

A

7 m/s and 56 m/s

Physics (9 decks)

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