What is the _word- equation for weight??
$$ \text{weight} = \text{mass} \times \text{gravitational field strength} $$
What is the symbol equation for weight??
$$ W = mg $$
The equation $W=mg$ is a special case of which more general formula??
$$ F = ma $$
What are the two different units for $g$, the acceleration due to gravity??
$$ \frac{N}{kg} \\ ms^{-2} $$
Which SUVAT equation would be the most useful for calculating $g$??
$$ s = ut + \frac{1}{2}at^2 $$
When using $s = ut + \frac{1}{2}at^2$ to calculate $g$, how can you simplify the equation??
$$ s = \frac{1}{2}at^2 $$
How could you rearrange $s = \frac{1}{2}gt^2$ for $g$??
$$ \frac{2s}{t^2} $$
What’s the simplest experiment you could perform to measure $g$ using $s = \frac{1}{2}at^2$??
Drop an object from a known height and measure the time it takes to fall.
If an object takes $0.1s$ to fall $1m$, how could you calculate $g$??
$$ \frac{2 * 1m}{0.1s^2} $$
How could you improve the inaccurate timing of a simple drop experiment for calculating $g$??
- Use light gates
- Use a trapdoor
- Use a phone camera
How could you reduce the effect of air resistance in a drop experiment for calculating $g$??
Use a streamlined object.
Instead of doing repeats for a single height, what are the two main reasons it is better to do varying heights??
- You can plot a graph:
- Can identify outliers
- Drawing a line of best fit is like taking an average
If you wished to plot a series of displacements ($s$) and times ($t$) for a drop experiment for calculating $g$, what would your axies be??
- $s$, along the x-axis
- $t^2$, along the y-axis
Why is it better to plot for $t^2$ rather than $t$ when doing calculating $g$??
Because it means the graph produced will be a straight line and you can calculate $g$ by finding the gradient.
When using the equation $s = \frac{1}{2}at^2$ to calculate error, what are the two sources of error??
- Displacement
- Time
How can you ensure that the displacement is measured accurately when calculating $g$ using a drop experiment??
- Ensure the ruler is level
- Check for zero errors
How can you ensure that the time is measured accurately when calculating $g$ using a drop experiment??
- Use light gates
- Use metal trapdoor
What is more accurate, using a metal trapdoor or light gates for calculating $g$??
Using light gates.
What three SUVAT variables do you know when calculating $g$ using light gates??
- $s$, displacement
- $u$, inital velocity
- $v$, final velocity
What SUVAT equation do you use when calculating $g$ using light gates??
$$ v^2 = u^2 + 2as $$
Why might an electromagnetic trapdoor method for calculating $g$ be inaccurate??
Because there may be some delay in the switch being toggled and the ball dropping.
What are the three methods for calculating $g$, in worst-to-best order??
- Simple use of a timer and ruler
- Using an electromagnetic trapdoor
- Using light gates and a timer card
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date: 2020-10-13 14:57
tags:
- '@?physics'
- '@?kinematics'
- '@?year-1'
- '@?school'
- '@?public'
title: Physics - Calculating Acceleration Due To Gravity