Download Forces and Motion Study Guide - Thomas C. Cario Middle School

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Transcript
Name
Period
Forces Study Guide
Forces and Newton’s Laws
1.) What is Newton’s First Law? Inertia
2.) Give an example of a stationary object with net force = 0. Parked car
3.) Give an example of an object in motion with balanced forces on it. Car going at a
constant speed, sky diver at terminal velocity
4.) When a car is going around a curve, what direction is the force pushing it, and
what holds it on the road? Straight line, friction of tires
How could these
forces become unbalanced? Ice on road
5.) Is an object with zero-net-force on it always at rest? Explain. No. Constant speed
is not accelerating
6.) Of what units is the Newton (N) comprised? Kg·m/s2
7.) What is friction? Force caused when surfaces rub together, always opposes
motion.
8.) In which direction does friction act on a moving object? In the opposite direction.
9.) Name 3 examples of reasons you would want to increase friction. Cleats, tires,
brakes, surf wax
10.)Name 3 examples of reasons you would want to decrease friction. Wax a rail, or
skis, motor oil, WD-40, bearings on board.
11.)Draw a force diagram for a car moving at a constant velocity.
11.
Opposite
arrows
are same
size.
Draw a force diagram for a book being accelerated from rest and sliding across a
Friction
arrow is
smaller
than
pushing
arrow
table.
12.)What is Newton’s Second Law? F=m · a
13.) What is the force equation? F = m ·a
14.)Calculate the acceleration of a 20kg mass with a 4N force on it. .2m/s2
4=20·a
15.)Calculate the mass of an object that is accelerated at 5m/s2 with 40N of force.
8kg
16.)Calculate the force on a 200kg object that has been accelerated to 5m/s2 1000 N
17.)If you double the force on an object, and its mass remains constant, what happens
to its acceleration? doubles
18.)If you triple the mass of an object, and apply the same force, what will happen to
the acceleration of the object? Decrease to 1/3
19.)If you want an object to accelerate 4 times as fast, what are the two things that you
can do? Decrease mass to ¼ OR increase force by 4x.
20.)What is Newton’s Third Law? Action-Reaction
21.) What is weight? Force exerted on your mass by gravity.
22.)Why would you weigh 0 Newtons in space? No gravity, so no force pulling on