# Shared Flashcard Set

## Details

knipp - ch.10 (forces)
forces
26
Physics
02/19/2010

Term
 unit of force
Definition
 newton or pound
Term
 two factors that have an effect on friction
Definition
 1) how hard the surfaces push together   2) the types of surfaces involved
Term
 the force that two surfaces exert on each other
Definition
 friction
Term
 type of friction that acts on objects that are not moving
Definition
 static friction
Term
 type of friction when two solid surfaces slide over each other
Definition
 sliding friction
Term
 type of friction when an object rolls over a surface
Definition
 rolling friction
Term
 type of friction when a solid object moves through a fluid
Definition
 fluid friction
Term
 ball bearings in skateboards exhibit this type of friction
Definition
 rolling friction
Term
 T/F fluid friction is greater than sliding friction
Definition
 false
Term
 T/F air resistance is a type of fluid friction
Definition
 true
Term
 what two factors determine the gravitational pull between two objects
Definition
 1) their mass   2) the distance between the two objects
Term
 T/F the farther apart two objects are, the greater the gravitational pull between them
Definition
 false
Term
 T/F    You weigh more on the Moon than you do on Earth.
Definition
 false
Term
 the greatest velocity a free falling object can reach is...
Definition
 terminal velocity
Term
 a thrown object
Definition
 projectile
Term
 an object at rest or in motion will remain at rest or in motion unless it is acted on by an unbalanced force
Definition
 Newton's 1st Law
Term
 an object's resistance to change in motion
Definition
 inertia
Term
 Newton's 2nd Law of Motion
Definition
 force = mass times acceleration
Term
 How can a truck have the same momentum as a bike?
Definition
 If the truck is moving very slow and the bike is moving very fast.
Term
 formula for momentum
Definition
 mass times velocity
Term
 If an object exerts a force on another object, then the second object exerts a force of equal strength in the opposite direction on the first object
Definition
 Newton's 3rd Law of Motion
Term
 What is the momentum of a bird with a mass of 0.018 kg flying at 15 m/s?
Definition
 0.27 kg-m/s
Term
 A speedboat pulls a 55 kg water skier. The force causes the skier to accelerate at 2.0 m/s2. Calculate the net force that causes this acceleration.
Definition
 110 N
Term
 The table below shows the mass and velocity of four animals. Which animal has the greatest momentum?                        mass(kg)                    velocity (m/s) cheetah               45                              20 grizzly bear         200                             13 hyena                  70                              18 wild turkey           11                               7
Definition
 grizzly bear (2600 kg-m/s)
Term
 A 7.3 kg bowling ball accelerates at a rate of 3.7 m/s2. What force acts on the bowling ball?
Definition
 27.01 N
Term
 T/F   The greater the mass of an object, the greater its inertia.
Definition
 true
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