Newton's laws
Net Forces
Mass and weight
Kepler's laws
Forces mystery
100
For an object acting according to Newton's 1st law the forces and velocity must be what?
Balanced and 0m/s or Constant
100
Is this a balanced or unbalanced situation? 
Unbalanced
100
If a dog has a mass of 35 kg what is her weight?
343 N
100
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 point
100
What is the force from a cable, rope, or chain?
Tension
200
For an object acting according to Newton's 2nd law the forces and velocity must be what?
Unbalanced and Changing velocity
200
Mr. Dudack is pushing a desk with 60 N of force east but the desk has 20 N of friction. What is the net force with direction?
40 N west
200
If a ball has a weight of 12.0 N what is its mass?
1.22 kg
200
According to Kepler's Second Law of Planetary Motion
what do the planets do in equal time periods?
They sweep out equal areas.
200
If the sum of forces on an object is not zero, what is the object doing?
Accelerating
300
Your friends car is broken down in the middle of the street and you are pushing it west with an acceleration of 0.0 m/s/s. Draw and label the FBD free body diagram)and what newton's law is this?
First law
300
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
300
If a KW student has a mass of 65kg on earth, what is the students mass in the planet Neptune?
M=65kg
300
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?
Closer planets to the sun revolve faster in orbit.
300
If a frustrated KW physical science student bangs his or her head against the wall with (-)20N of force because they can't figure out the concept builder, what is the force produced by the wall?
(+) 20N
400
A KW football was just kicked upward and is on its way to the goal. What forces are acting on the ball in the Y direction and X direction and what Newton's law is this?
Y = Gravity and air resistance
X = Air resistance only
Second law
400
A 1.2 kg hockey puck slides across the ice on planet venus that has a acceleration due to gravity of 8.87 m/s/s until it stops with a frictional force of 3.0 Newtons.
a) What is the puck's weight?
b) Which law is this?
b) Why
a) What is the puck's weight? 10.6 N
b) Which law is this? Second
b) Why = slowing down or changing velocity
400
What is the acceleration due to gravity in Jupiter if hammer is dropped and it changes its velocity by 24.8 m/s/s?
g= 24.8m/s/s
400
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.
400
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
500
A sledder is sliding down a hill to the right and is slowly coming to rest. Draw and label an FBD and what Newton's law is this?
Second law
500
On Earth, you have a giant 2kg sucker that is being suspended (at rest) by a unicorn mane hair that is feeling a tension force of 15.6N. Part of the sucker rests on a scale (that’s on the ground), which reads 4N. Find:
- Its Weight/Fg
- F net=
- acceleration=
- Its Weight/Fg = 19.6
- F net= 0 N
- acceleration= 0 m/s/s
500
a)How does mass and weight compare?
b)What are the units of each?
c) which one changes with location?
a)Mass is stuff and weight is the force of gravity on an object.
b) Kg and N
c) Weight
500
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.
500
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?
a= 2.67 (m/s)/s