Forces In Action Flashcards
Circular motion
Velocity keeps on changing because direction keeps on changing
Centripetal acc is the acceleration if the object moving round the circle towards the centre of the circle
• centripetal force=?
• centripetal force depends on..?
• equation?
The centripetal force increases as…. (3)
• centripetal force= resultant force that causes the centripetal acceleration of an object moving round a circle
- depends on its mass, speed and radius
- Fc= mv^2 / radius
As…. The mass, speed and radius increase
The pendulum
Time period depends only on its length
To measure time period…?
Amplitude of an oscillating object?
Time period equation?
Take 20 oscillations and divide by 20
(One is from a to b to a again- past equilibrium position)
Amplitude of an oscillating object is distance moved from highest point on one side back to it (a to b to a)
• time period(s)=1/ frequency of the oscillations (Hz)
Centre of mass
What is it?
How to test?
Of a symmetrical object?
Time period depends on its….?
- point at which the mass of the object may be thought to be the most concentrated
- suspend from rod, attach plumb line, do multiple points, draw lines directly below rod
- lines of symmetry
- of pendulum- it’s length
Moments
Load Effort Pivot Force multiplier Line of action
Weight of object
Force applied
Smaller effort for a bigger load
Kind along which a force acts
Moments in balance
What is the principle of moments?
The equation used?
The sum of all the clockwise moments about any point
The sum of all anti-clockwise moments about that point
- w1d1 = w2d2
Moments in balance
What is the principle of moments?
The equation used?
The sum of all the clockwise moments about any point
The sum of all anti-clockwise moments about that point
- w1d1 = w2d2
Stability
Increased by…
Will topple if….
Making base as wide as possible and it’s com as low as possible
If line of action of its weight is outside base
If resultant momentum about its point is not zero
