Quiz 2 Review
a) What does the mass of an object tell you?
b) What is its standard unit of measure?
c) How does it change if you take the object to the moon? Why?
a) The amount of atomic stuff (or matter) in an object
b) kilograms
c) The mass will stay the same on the moon because the mass is what it is made up of and that doesn't change because of where it is.
According to Kepler's First Law of Planetary Motion
a) what is the shape of a planet's orbit around the sun
b) where is the sun
a) elliptical
b) one focus
If an object is acting according to Newton's First Law what can you say about its velocity?
Velocity is 0 m/s or constant
If an object is acting according to Newton's Second Law what can you say about its velocity?
The velocity is changing, it can be increasing or decreasing.
A person pushes a 3.8 kg box across the floor to the right with a force of 16 N and it moves with a constant velocity.
a) Which law is this?
b) Why
a) Newton's First Law
b)The box has a constant velocity.
a) What does the weight of an object tell you?
b) What is its standard unit of measure?
c) How does it change if you take the object to the moon? Why?
a) The amount of the force of gravity acting on an object.
b) Newtons
c) The object has less weight on the moon because the acceleration due to gravity is less on the moon because the moon has less mass than the Earth.
According to Kepler's Second Law of Planetary Motion
what do the planets do in equal time periods?
They sweep out equal areas.
If an object is acting according to Newton's First Law what can you say about its acceleration?
The acceleration is zero (m/s)/s.
If an object is acting according to Newton's Second Law what can you say about its acceleration?
The acceleration cannot be 0 (m/s)/s
A person pushes a 3.8 kg box across the floor to the right with a force of 16 N and it moves with a constant velocity.
a) What is the weight of the box?
b) What is the normal force on the box?
c) What is the force of friction on the box?
The universe is expanding and galaxies further away are moving away faster.
a) 37.24 N
b) 37.24 N
c) 16 N (The same as the force that was pushing it)
An object has a mass of 175 kg on Earth (g on moon is 1/6 g on Earth)
a) what is its weight on earth?
b) what is its mass on the moon
c) what is its weight on the moon?
a) 1715 N
b) 175 kg
c) 286 N
According to Kepler's Third Law of Planetary Motion there is a relationship between the distance between the sun and a planet (R) and the time it takes the planet to revolve around the sun (T). What is that relationship?
(T2)/R3)
If an object is acting according to Newton's First Law what can you say about the forces acting on it.
The forces are balanced.
If an object is acting according to Newton's Second Law what can you say about the forces acting on it.
The forces are not balanced.
A 1.2 kg hockey puck slides across the ice until it stops with a frictional force of 3.0 Newtons.
a) Which law is this?
b) Why
a) Newton's Second Law
b) The puck is slowing down
a) What is a car's acceleration if it speeds up from
7 m/s to 22 m/s in 5 sec.
b) What does an acceleration of 36 (m/s)/s mean?
a) (3 m/s)/s
b) The object speeds up 36 m/s every second
According to Newton's Law of Universal Gravitation what 2 ways can you increase the force?
Increase the mass of one or both of the objects and decrease the distance between them.
If a wagon is rolling down a hill at a constant speed which of Newton's Laws is acting on it? Why?
Newton's First law because the wagon has a constant speed.
If a box is being pulled with 180 N of force across a floor with a frictional force of 45 N, what is the unbalanced force acting on the box?
135 N
A 1.2 kg hockey puck slides across the ice until it stops with a frictional force of 3.0 Newtons.
a) What is the weight of the puck?
b) What is the normal force on the puck?
c) What is the unbalanced force acting on the puck?
a) 11.76 N
b) 11.76 N
c) 3.0 N
What does Newton's Law of Universal Gravitation say?
All objects with mass exert a force on all other objects with mass.
According to Newton's Law of Universal Gravitation what 2 ways can you decrease the force?
Decrease the mass of one or both of the objects and increase the distance between them.
If a ball is rolling down a hill and speeding up which of Newton's Laws is acting on it? Why?
Newton's second law because the ball is speeding up.
If there is an unbalanced force of 65 N acting on a
12 kg crate, what is the acceleration of the crate?
5.5 (m/s)/s
A 1.5 kg puck weighs 14.7 N and slides across the ice with a frictional force of 4.0 Newtons until it stops.
What is the acceleration of the puck?
2.67 (m/s)/s