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Physics > MOTION > Flashcards

MOTION Flashcards

1
Q

If a car travels from the house, to a shop, and back, what is the displacement?

A

Zero

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2
Q

How to calculate speed?

A

distance * times

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3
Q

What is velocity?

A

Speed in a direction

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4
Q

What is the gradient on a distance time graph?

A

Speed

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5
Q

What is the gradient on a velocity time graph?

A

Acceleration

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6
Q

What is the gradient on a displacement time graph?

A

Velocity

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7
Q

What graph and how to find displacement?

A

Area underneath velocity time graph

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8
Q

What is kinematics?

A

The study of motion of objects and their spacial relationships without giving reference to mass or forces that may chaneg its direction or speed.

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9
Q

What is the units for speed, velocity and acceleration?

A

Speed and velocity is ms^-1
Acceleration is ms^-2

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10
Q

What is the difference between average and instantaneous speed?

A

Average is over the whole journey whilst instantaneous is at a given point in time. Average speed does not change but instantaneous does.

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11
Q

Draw all graphs to know the shape

A

Look online to check

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12
Q

Components on suvat equation

A

s Displacement, u initial velocity, v final velocity, a acceleration, t time

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13
Q

What does an acceleration of 3ms-2 really mean?

A

Over the time given the car has accelerated by 3 m each second

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14
Q

What is the thinking distance?

A

Distance travelled between when the reason is first seen to when the brakes are applied

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15
Q

What is the braking distance?

A

Distance travelled from time the brake is hit to the car stops

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16
Q

What is the stopping distance?

A

Thinking + stopping

17
Q

What is free fall?

A

Object is accelerating under gravity with no other force acting on it

18
Q

What does g equal to?

A

9.8

19
Q

Explain features of ‘trolleys? (investigating motion and collisions)

A

A wood block, ball- bearing wheeles to reduce friction, spring-loaded plunger for collisions, flat top for additional stacking

20
Q

Explain ‘air-track gliders’ (investigating motion and collisions)

A

Investigate conservation of momentum after collision, reduces friction therefore maximises elastic collision

21
Q

What is elastic collision?

A

There is no net loss in kinetic energy in the system as a result of the collsion

22
Q

Describe ‘ticker timers’. (investigation in motion and collisions)

A

Long tape attached to moving trolley, threaded thro a device that places a tick upon the tape at regular intervals of time. Dots travel at same speed as trolley. Distance between dots and the time used to find velocity.

23
Q

Describe ‘light gates’

A

Most accurate way or measuring time, connected vertically or horizontally to clamp

24
Q

Descibr ‘data loggers’

A

An electronic device that record data and stores it for further analysis. Records at regular intervals or when triggered by a sensor eg light gate.

25
Q

Describe ‘video techniques’

A

Used to determin g, projectile motion and terminal velocity. The frames per second and distance must be known.

26
Q

What do we presume in projectile motion?

A

No air resistance.

27
Q

Describe acceleration for horizontal and vertical motion?

A

Horizontal motion - No acceleration, constant velocity
Vertical motion - When moving down -9.8

28
Q

How can we demonstate that vertical and horizontal motion will take the same amount of time?

A

Drop a ball and project a ball from the same height.
Takes same amount of time.

29
Q

What can suvat be used for in projectile motion?

A

Displacement, time of flight

30
Q

How to find velocity of horizontal and vertical component?

A

Horizontal = vcosx
Vertical = vsinx

31
Q

Other than no acceleration, why does horizontal veloctity remain constant?

A

HA = gcos90 = 0

32
Q

What is pytha used for in projectile motion?

A

Finding the overal velocity.

33
Q

What do we use trig for in projectile motion?

A

Find the angle of projection.

34
Q

When is displacement 0 in projectile motion?

A

The vertical component (use in suvat).

35
Q

What is symmetric parabola?

A

When there is a line of symmetry.

Physics (7 decks)

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