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2 cards from this section. Quick, good the night before a test.
What is the net force acting on a cork of mass 10 g floating on water?
Think about the forces of buoyancy and gravity.
What happens to the force acting on a stone dropped from a train moving at constant speed?
Consider the reference frame of the stone.
What demonstrates Newton's first law?
Think about the effects of unbalanced forces.
True or False: Frictional force only acts when an object is in motion.
Consider static friction.
A block of mass 10 kg is resting on a horizontal surface with a coefficient of static friction of 0.5. What mass can be added without causing it to slide?
Use the concept of forces acting downward and friction.
If a car travels at 20 m/s in a straight line and suddenly hits a wall, how would you calculate the force on the car if it took 0.5 seconds to stop?
Impulse relates to the change in momentum during the collision.
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