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25 Cards in this Set
- Front
- Back
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object thrown upwards... falls down...
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a=-9.8ms^-2
a=+9.8ms^-2 |
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at EQUILIBRIUM means...
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upward FORCES=downward FORCES
clockwise TORQUES=anticlockwise TORQUES |
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projectile motion
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HORIZONTAL velocity stays the same, no acceleration & VERTICAL velocity changes, accelerates towards Earth
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an Elastic collision
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kinetic energy is conserved
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inelastic collision
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some kinetic energy is converted to other types of energy such as heat or sound
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circular motion
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F and a towards centre
*if F is removed, flies off at a tangent due to Newton's first law of motion |
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area under velocity-time graphs represents...
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distance travelled
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projectile motion
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involves jumping up and down and moving forwards at the same time
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Forces (changes)... balanced.... unbalanced....
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balanced: can change the shape of an object
unbalanced: can change the direction/or speed of an object |
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mass is... weight is due to...
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the amount of matter in an object (kg)
-gravity |
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torque
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1. upward forces=downward forces
2. the sum of the anticlockwise moments about any point is equal and opposite to the sum of the anticlockwise moments about that point |
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vectors
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the length of the line being the magnitude of the vector and the direction of the line the direction of the vector
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momentum
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moving objects resist being stopped (inertia)
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the bigger the momentum change...
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the greater the force
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momentum is conserved...
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in a collision
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momentum before=
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momentum after
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velocity of object going round and round is
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constantly changing so there must be an external force upon it-the centripetal force. remove this force and objects flies off at a tangent.
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work
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is only done when a force makes something move or tries to stop it moving
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whenever work is done...
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energy is transferred
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kinetic energy
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is the energy an object has because of its movement
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as object.... speeds up... slows down...
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gains Ek
Ek decreases |
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gravitational potential energy
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position being raised above ground
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Newton 1
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an object at rest will stay at rest unless acted upon an external force
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Newton 2
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-the law of impulse
-an object's momentum will change due to the size of an unbalanced force acting upon it |
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Newton 3
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for every action there is an opposite and equal reaction
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