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Physics Midterm review
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In space, does an object have mass?
YES
Which has more Inertia 10 kg object or a 50 kg object?
50
What is the reaction force to your weight?
You pull the Earth
Two forces act on you when you are standing motionless on the floor, the force due to gravity and the force of the floor. These two forces are equal and opposite. Are they the action- reaction forces?
NO!
Calculate the number of millimeters in 2.13 kilometers.
2130000
A 30-kg girl runs up the staircase to a floor 5 m high in 8 seconds. What is her power output?
187.5 Watts
A 60-kg person on in-line skates pushes against a wall with a force of 30 N and recoils. What acceleration does that person experience?
0.5 m/s/s
A 20-kg block of cement is pulled upward (not sideways!) with a force of 400 N. What is the acceleration of the block?
10 m/s/s
An unbalanced force of 30 N gives an object an acceleration of 6.0 m/s2. What force would be needed to give it an acceleration of 1.0 m/s2?
5 N
On the surface of Jupiter, the acceleration due to gravity is about 3 times that on Earth (g=29.4 m/s/s). How much would a 0.40-kg rock weigh on Jupiter?
11.76 N
The following forces act on an object: 9 N north, 52 N south, and 55 N west. What is the magnitude of the net force? (direction also)
69.8 N SW
Emma walks to school at a speed of 3 miles per hour. If it takes her 20 minutes to walk from home to school, how many miles away is the school from her house?
1 mile
What is the speed of a 5 kg object falling to the bottom of a 5 meter tall hill?
10 m/s
What concept: Two forces cancelling each other out, so they exist, but they add up to zero.
Vector addition or equilibrium
What law: It's HARDER to push a BIG rock than a pebble from rest due to this.
First law
What law: I hit a wall and feel the wall hitting me
Newton's Third law
Name THREE physics scientists...
Aristotle, Einstein, Newton, Joule, Watt, Hooke, Bohr, Rutherford, Millikin,
Put these in order from lowest to highest. 1 Megameter, 1 cm, 1 mm, 1 meter, 1 nanometer, 1 Gigameter
nm, mm, cm, m, Mm, Gm
If I lift up a brick, I am lifting up the _______ of the object.
weight
If there are two forces on an object, 20 N and 30 N, what are the MINIMUM and MAXIMUM resultants possible?
10 N and 50 N
If there are two forces on an object, one of 10 N and the other of 20 N, could 28 N be the resultant?
yes
A Net force on an object of 10 kg is 10 N. What is the acceleration of the object?
1 m/s/s
A Net force on an object of 10 kg is 10 N. What is the acceleration of the object?
1 m/s/s
An object at constant speed means the sum of the forces =
Zero
if a am moving at 50 m/s and a force stops me in 5 seconds, my acceleration is (be careful sign matters and unit matters)
-10 m/s/s
He believed that all objects keep moving because you stopped pushing them.
Aristotle
Physics is ________.
Phun
Physics is the study of matter and __________
energy
Convert 150 cm to meters
1.5 meters
Convert 200 cm to meters
2 meters
The unit Joule / second is the same as .....
Watt
The unit Newton*meter is the same as a ...
Joule
The rate of doing work is called ....
POwer
The slope of a distance time graph is the ____________.
average speed
The slope of a speed versus time graph represents the...
acceleration
If you exert the same force on Earth that Earth exerts on you, why doesn’t Earth move up to meet you when you jump off its surface?
it has too much mass
Calculate the power required to move a 2,000-kilogram automobile to the top of a 100-meter hill in 15.0 seconds. Express the power both in units of watts and horsepower.
133333.33 Watts
What is the weight in newtons of a 15-kilogram toddler on Earth?
150 N
A speeding truck makes contact with a bug on its windshield. Compare the force that the bug exerts on the truck to the force the truck exerts on the bug.
Forces are the same for both
When you drop a sheet of crumpled paper and a sheet of flat paper off a table at the same time, why does the flat sheet of paper hit the ground later?
air friction
The pulling force that always acts along the direction of the rope in a pulley system is called ____________________.
Tension
“Energy can never be created or destroyed, just transformed from one form to another” is a statement of the law of ______________________________ (three words).
Law of conservation of energy
The kinetic energy of an object depends upon two things: ____________________ and ____________________.
mass and velocity
The expression mgh represents _________________________ energy.
Potential
Speed with a direction is called ______________________.
velocity
An object in motion wants to stay in motion, and an object at rest wants to stay at rest, is a way of stating _______________________________.
Newton's first law
An object accelerating toward Earth under only the influence of the force of gravity is said to be in ____________________ (two words).
free fall
The motion of an object will continue in the same direction at the same speed unless the object is acted upon by a(n) ____________________.
unbalanced force
A ball is being twirled on the end of a string as pictured in the diagram: If the string is released when the ball reaches point P, the inertia of the ball will cause it to move in the direction of:
C
The diagram below represents a box sliding down an incline: The force of friction acting on the box is directed toward:
2
When you are seated in a chair, the force exerted by you on the chair is called the:
weight
When you are seated in a chair, the force exerted on you by the chair is called the:
Normal force
Maya kicks a soccer ball with 4 newtons North. At the exact same time, Casey kicks the same ball 8 N West. The resultant force of the soccer ball is about _____ Newtons.
8.9 N NW
A measured quantity that is described by stating a size and a direction is called a:
Vector
A word meaning “size”often used to describe scalar quantities is:
magnitude
The measure of how effective a machine is in using energy to do work is called its _________
efficiency
A 2.2-kilogram crate is pulled by a 30-newton force over a distance of 5 meters. The work done by pulling the crate is ____ joules.
150 Joules
Shawna, who weighs 54 kilograms, is roller blading on a level surface. If she is rolling at 12 meters per second, to what height would she roll up an incline before stopping? (Assume there is no friction.)
7.3 meters
Lifting a 70-kilogram barbell 2.0 meters above the floor increases its potential energy by about:
1400 Joules
Work may be measured using units of:
Joules
An object falls without friction near Earth’s surface. The loss of its potential energy is equal to its gain in ___________ energy
Kinetic
Energy that is stored due to the position of an object may be called ____ energy.
Potential
A rocket can fly into space because what pushes on the rocket?
The exhaust gases
According to Figure 2-1A, what is the speed of the 2.0-kilogram mass when the time equals 5 seconds?
3 m/s
The graph below represents the motion of a moving vehicle. What is the speed of the vehicle during the time interval from t = 2.0 seconds to t = 4.0 seconds?
10 m/s
A skydiver reaches an instantaneous velocity of 88.2 meters per second before opening his parachute. How long was he in free fall?
9 seconds
Terminal speed occurs when:
force of gravity (weight) = air resistance up
The acceleration due to gravity is:
9.8 m/s/s
Two forces are applied to a 2.0-kilogram block on a frictionless, horizontal surface, as shown in the following diagram. What is the acceleration (speed and direction).
3 m/s/s right
The inertia of two objects must be the same if the same force causes the same ____?
acceleration
The metric unit of mass, distance and time preferred by scientists are the:
kilogram, meter, second
The metric unit of force preferred by scientists is the:
Newton
The rate of change in the speed of an object is known as:
acceleration
The weight of a 10 kg object is....
100 Newtons
The weight of a 10 Newton object is .....
10 Newtons
The Newton is defined as the force of that can give a ______kg object an acceleration of ________ m/s/s,
1
If the net force acting on a moving object is zero, the object will do what in regards to speed and direction?
continue in the same direction with no change of speed.
Gwen rides her bicycle 2.4 kilometers up a steep hill in 8 minutes. Her speed is ____ kilometers per minute.
0.3 km/min
Doug rides a motorcycle at an average speed of 42 miles per hour for 3.6 hours. The distance he travels is about ____ miles.
151 miles
If you know the distance traveled and the amount of time it took, speed may be calculated by:
dividing distance by time
How many seconds in one week?
604800
Which is bigger, a 100 centimeters or 1000 millimeters?
They are the same
The slope of a distance time graph is the object's....
average velocity
For every action there is a (n) ________ and opposite reaction, and is the basis for what law?
equal / Newton's third law
F = ma relates to what law?
Newton's Second law
Newton's First Law is sometimes called the law of what?
Inertia
How fast is a freely falling object going when it falls for 9 seconds?
90 m/s
How far does a freely falling object fall for 12 seconds?
720 meters.
What is the unit of Work called?
Joule


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