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15 Cards in this Set
- Front
- Back
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when speed net force is zero or the velocity is constant what do you do?
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use a closed triangle
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when torque is at equilibrium....
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support force is larger
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when a ball is thrown up into the air, what happens?
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-gravity is unbalanced force acting on ball which goes downwards
causes ball to accelerate downwards -hence ball stops when reached max height as it decelerates as it goes up |
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when elastic objects collide force can be reduced by
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-force is reduced by increasing time of impact since change in momentum is the same
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momentum is conserved....
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in a collision
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the unbalanced force of a circle is the
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centripetal force
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when there is no horizontal or vertcal force...
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velocity must be constant
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because object is constantly being accelerated down at 9.8 hence
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velocity a the top is 0
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to have a shorter stopping time will increase... so...
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size of objects decceleration as F=ma and m is constant
-larger deceleration requires a larger opposing force (e.g upward) |
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when object is at equilibrium
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net force is zero, torque is zero and velocity is constant or acceleration is zero
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by increasing horizontal force...
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it causes the horizontal force to become unbalanced and result in acceleration
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how do you find out if collision is elastic or inelastic?
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-need to do calculation of KE to see if value is the same or different
-if different, it is inelastic -if same, it is elastic |
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when the change in momentum is the same, we can get less for by
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having a longer impact time
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when can W=Fd only be used?
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when the force is constant
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in F=kx extension increases so
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force increases
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