Motion Flashcards

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1
Q

What is the the formula for average speed? And what’s is speeds units?

A

Distance travelled divided by total time taken measured in meters per second or ms^-1

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2
Q

Define instantaneous speed.

A

Instantaneous Speed is the speed of a car taken at a very small time interval and can be calculated by getting the tangent to a line on a distance time graph.

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3
Q

Describe the difference between velocity and speed.

A

Velocity is a vector quantity as it is in a certain direction and uses displacement instead of distance

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4
Q

Formula for acceleration

A

Change in velocity divided by change in time or ms^-2

Minus the initial velocity from the final velocity and divide that value by the time taken

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5
Q

What is the area under a velocity time graph show?

A

Displacement

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6
Q

What do the letters of suvat stand for?

A
S-Displacement 
U-initial velocity
V-Final Velocity
A-Acceleration 
T-Time taken
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7
Q

What are the components of a stopping distance and define what they mean?

A

Thinking Distance- Is the distance between seeing the reason to stop and the moment the driver presses on the brakes
Braking Distance- is the distance travelled after the brakes have been applied till when the cars comes to a stop.

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8
Q

How do you calculate Thinking Distance?

A

Speed x Reaction time

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9
Q

Acceleration Due to Gravitys value?

A

9.81ms^-2

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10
Q

Think of a way to calculate gravity?

A

An electromagnet holds a small steel ball above a trapdoor. When the current is switched off, a timer is triggered, the electromagnet demagnetises, and the ball falls. When it hits the trap door it triggers the timer to stop

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11
Q

Talk about projectile motion

A

The vertical velocity is affected by gravity. Then with this value calculate the time it is in the air and then calculate the vertical distance using speed = distance over time

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