# LINEAR MOTION

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What is acceleration of free fall?
the motion of an object accelerating at 'g' // acceleration caused by the earths gravitational field // it is uniform
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What forces act on an object when it is in free fall?
only weight (W=mg)
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What is weight?
the force on an object caused by a gravitational field acting on its mass
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What is weight measured in?
Newtons
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What does acceleration of free fall look like on a displacement-time graph?
curve, starting at y-axis x=0
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What does acceleration of free fall look like on a velocity-time graph?
straight line through origin
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What does acceleration of free fall look like on an acceleration-time graph?
straight line at 9.81
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What were Aristotle's ideas of motion?
objects of more mass will fall at a greater rate as the force acting on them were larger // heavy objects fall faster
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How did Galileo's experiments overturn Aristotle's ideas of motion?
dropped different weights / rolled them down a ramp - all objects fall with the same constant acceleration, hit the ground at the same ime
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What equipment will you need to carry out an experiment to estimate 'g'?
electromagnet / ball bearing / battery / switch / timer / trap door
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How will you carry out an experiment to estimate 'g'?
1. measure h from bottom of ball to trapdoor 2. flick switch to simultaneously start timer and disconnect electromagnet to release ball 3. ball falls knocking trapdoor breaks circuit stops timer
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What equation will you use in the experiment to estimate 'g'?
h = 0.5gt^2
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Why does this experiment only give an estimate of 'g'?
errors - measurement of h done with ruler +/-1mm uncertainty // dwarf errors from switch delay or timer
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describe horizontal velocity in projectile motion
constant as no force acting
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describe vertical velocity in projectile motion
constant 'uniform acceleration' as only 'g' acting
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How would you draw vector on a projectile motion diagram
horizontal v is the same // vertical v goes upwards then decreases to 0 at max point, change in direction to negative velocity
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How would you calculate the maximum height/ displacement on an object?
at this point Vf=0 so resolve equations using that assumption
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## Other cards in this set

### Card 2

#### Front

What forces act on an object when it is in free fall?

#### Back

only weight (W=mg)

What is weight?

### Card 4

#### Front

What is weight measured in?

### Card 5

#### Front

What does acceleration of free fall look like on a displacement-time graph?

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