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