Chapter 12 Review- GS3
A package falls off a truck that is moving at 30 m/s. Neglecting air resistance, the horizontal speed of the package just before it hits the ground is:
30 m/s
On the surface of Jupiter, the acceleration due to gravity is about 3 times that on Earth. How much would a 100 kg rock weigh on Jupiter?
300 kg- weight changes with gravitational pull
On the surface of Jupiter the acceleration due to gravity is about 3 times that on Earth. How much would a 100 kg rock weigh on Jupiter?
3000 N
Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has twice as much
inertia, mass, and volume
If the net force on a cart is tripled, the cart's acceleration
is three times as much
Whenever the net force on an object is zero, its acceleration
is zero
One newton equals one
kg m/sec/sec
A car by itself is capable of a certain maximum acceleration. When it tows a car of the same mass, its maximum acceleration is
one half
An example of friction other than sliding or rolling
static, fluid, floating downward from a cliff parachute(fluid); feet hitting the ground when gravel (static)
A rock weighs 30 N on Earth and another rock weighs 30 N on the Moon. Which rock has the greater mass
the rock on the moon
A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected, the force required to keep the puck sliding at constant velocity is
0 N- because there is no force resisting the motion.
A bag of groceries that has a mass of 10 kilograms weighs about
100 N
A car has a mass of 1000 kg and accelerates at 2 m/s2. What net force is exerted on the car?
2000 N
An empty roller coaster car at an amusement park takes 3 mins to make its ride from start to finish. Neglecting friction, a fully loaded car would take
3 min.
The weight of 0.6 kg of salami is about
6 N
Near the surface of the Earth, the value for the acceleration due to gravity is
9.8 m/s/s
A 10-kg brick and a 1-kg book are dropped in a vacuum. The net force of gravity on the 10-kg brick is _____. a) zero b) 10 times as much as the force on the 1-kg book c) the same as the force on the 1-kg book
C- the same as the force on the 1-kg book
An example of sliding friction
Coaster on a table Ironing clothes Sled or skis on snow Sliding on a slide Wooden box against the floor
Who is considered to be the father of modern science? A. Plato B. Aristotle C. Copernicus D. Galileo E. Newton
Galileo
Book resting on a shelf or ball floating on water is an example of
balanced forces
Terminal velocity is
constant velocity
The combined force of two unbalanced forces exerted in opposite directions is the
difference between the two forces
According to Newton's law of inertia, the result of walking much of the day is similar to tightening the head of a hammer when its handle hits a solid surface so that we are actually a little bit shorter in the
evening
A truck is moving at constant velocity. Inside the storage compartment, a rock is dropped from the midpoint of the ceiling and strikes the floor below. The rock hits the floor:
exactly below the midpoint of the ceiling.
a push or pull is called
force
A moving object's motion is opposed by the force is called
friction
Which of the following is not a force? A. Tension B. Kinetic friction C. Static friction D. Gravity E. Normal force
gravity
If an object's mass is decreasing while a constant force is applied to the object, the acceleration
increases
1st law of motion deals with the property of matter that reflects change in motion. A body in motion tends to stay in motion
inertia
If you are carrying a heavy bag of groceries and bang your hand against the wall, the concept that most explains why you are hurt is:
inertia
A force is a vector quantity because it has both
magnitude and direction
Acceleration is determined by the force acting on an object and by that object's
mass
The term "Uniform Motion" means that an object is not:
movement with a change in speed nor direction.
On the surface of Jupiter, the acceleration due to gravity is about 3 times that on Earth. What would be the mass of a 170 kg rock on Jupiter?
the mass is the same: mass is constant- 170 kg
Strange as it may seem, it is just as difficult to accelerate a car on a level surface on the Moon as it is here on Earth because
the mass of the car is independent of gravity.
A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. This best demonstrates that:
the milk carton has inertia
Mass times acceleration due to gravity equals a force called
weight
The sum of balanced forces equals
zero
T/F An object thrown into the air becomes a projectile
T
A 1-kg ball is thrown at 10 m/s straight upward. Neglecting air resistance, the net force that acts on the stone when it is halfway to the top of its path is about
10 N
As an object freely falls downward, its A. velocity increases. B. acceleration increases. C. Both of these. D. None of these.
A. velocity increases. (acceleration remains constant at 9.8 m./s2)
Three forces act on the object show. If the net force is zero. What is the magnitude of the unknown force? upward force 30N and doward force 50N. What is the unknown upward force A. 0 N B. 20 N C. 40 N D. 60 N E. 80 N
B. 20 N
What is a net force? A. It is the force acting on a net. B. It is the sum of all forces acting on an object. C. It is always equal to zero D. It is the weight minus the normal force E. It is the same as the mass.
B. It is the sum of all forces acting on an object.
A baseball & a bowling ball are dropped from the same height at the same time. Which reaches the ground first? A. The baseball B. The bowling ball C. They land together D. More information is needed.
B. The bowling ball
T/F Fluid friction opposes motion to a greater degree than sliding friction does.
F
The scientist to first introduce the concept of inertia was
Galileo
In which case would you have the largest mass of gold? If your chunk of gold weighed 1 N on the
Moon- The gravitational acceleration on the moon is 1/6 of the earth. To have the same weight, we need more mass for the object on the moon.
The laws of motion are accredited to who?
Newton
Two forces acting on two different objects concerns which of Newton's laws?
Newton's 3rd Law
An example of rolling friction
the use of ball bearings Wheels on vehicle, train, skateboard Soccer ball, Basketball, Baseball
