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7/27/2019 2_3 Force Mass Acceleration
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Resultant forcesFind the resultant force on these objects.
2.3 Force and acceleration29 October 2013
10N 5N 10N 20N
10N
30N
10N 10N
15N
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2.3 Force and acceleration29 October 2013
5N 30N
20N 5N
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LOsBe able to explain how force and mass affectacceleration
V Majer
2.3 Force and acceleration29 October 2013
The F18 Hornet aircrafttakes off at 140mph andweighs almost 30 tons.
Aircraft carriers are notlong enough for it to reachthis speed. Steam catapultshelp the launch.
http://www.youtube.com/watch?v=VVdvTof186w&NR=17/27/2019 2_3 Force Mass Acceleration
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How are force and acceleration connected?
1. Set up apparatus as shown.2. Attach a 50g mass to the
end of the string.3. Time how long it takes forthe trolley to travel 1metre.
4. Add another 50g andrepeat.
5. Take 5 different readings.
Trolley String pulley
Weight
Ramp
Diagram
Method
Weight (N) Time (s)
Results
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Acceleration is proportional to force
The mass pulls the trolley along thetrack, and it accelerates because of
_______.
If we increase the weight (a force),acceleration will ______.
Force
Acceleration
Complete thissketch graph.
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Acceleration is proportional to force
The mass pulls the trolley along thetrack, and it accelerates because ofgravity.
If we increase the weight (a force),acceleration will increase.
Acceleration
Force Force increases sothe accelerationincreases.
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Acceleration is inversely proportional to mass.
If this time we change the mass of theobject being pulled, increasing it by 1kg.
The following graph is obtained.acceleration
mass
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You should be able to:All
Be able to explain that if force is increasedacceleration is increased and if Mass is increased then
acceleration is decreased.Most
Be able to use equation ( if given)
Force = mass x acceleration.
Check
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Practical.
A trolley rolls along a track.
A ticker timer is used to calculatespeed and acceleration
Different forces are use to start itmoving
Then different masses are added andthe experiment is repeated
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Results
1N 2N 3N1st reading (taken at0s)
0m 0m 0m
2nd reading (taken at1s) 1m 2m 3m
Change in speed (m/s)
Acceleration (m/s)
Copy and complete
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Question
What is the relationship betweenthe acceleration and the force?(use
an ER...ER relationship)
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Results
1kg 2kg 3kg1st reading (taken at 0s) 0m 0m 0m
2nd reading (taken at1s)
1m 0.5m 0.33m
Change in speed (m/s)
Acceleration (m/s)
Copy and complete
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Question
What is the relationship betweenthe acceleration and the mass? (
Use an ER............ER relationship)
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We have discovered:
1. As force increases so doesacceleration. (This is common sense,the harder you push something, thefaster it moves!)
2. As weight increases, accelerationdecreases. (Again, this isnt rocket
science! If somethings heavy its hardto shift!)
Copy
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Mathematical relationships
Force = Mass X Accelerationnewtons kilograms metres/second
FM XA
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