FBDs
Draw a FBD for a golf ball falling downward. Ignore drag.
1 force
What are the two types of friction?
Static and kinetic
State Newton's 2nd Law of Motion.
F = ma
Determine the force of a 15 kg toy car accelerating at 2.5 m/s^2.
37.5 N
What is the gravitational force formula?
Fg = G x Mm/r^2
Draw a FBD for a book at rest on a table.
2 forces
This type of friction is present when an object is moving.
Kinetic friction
State Newton's 1st Law of Motion.
An object at rest tends to stay at rest, and an object in motion tends to stay in motion unless acted upon by a net external force.
Your car has a mass of 2000 kg. If it produces a force of 5000 N, how quickly will it accelerate?
2.5 m/s^2
What does r represent in the gravitational force formula?
The distance between the centers of the objects
Draw a FBD for a car moving along a highway at a constant speed. Ignore drag.
4 forces
What does mu represent?
Coefficients of friction
State Newton's 3rd Law of Motion.
For every action, there is an equal but opposite reaction.
A 2.20 kg fan cart is moving to the right by generating a 0.410 N thrust. Neglecting friction and drag, what is the cart's acceleration?
0.186 m/s^2
As distance increases, what happens to the gravitational force?
It decreases exponentially
Draw a FBD showing two people pushing on a table but the table does not move.
5 forces
How much friction is present on a 50 kg rolling cart if the coefficient of kinetic friction between the wheels and the tile is 0.25?
122.63 N
Two people push on a table with 15 N of force in opposite directions. What is the resulting net force? Is the velocity constant or changing?
A 5 kg model rocket generates 80 N of thrust while experiencing a 70 N drag. What is the rocket's acceleration?
2 m/s^2
Two spherical objects have masses of 200 kg and 500 kg. Their centers are separated by a distance of 25 m. Find the gravitational attraction between them.
1.1 x 10^-8 N
Draw a FBD for a parachuter falling downwards but slowing down as they descend.
2 forces
In a scenario where the coefficient of static friction is 0.30 and the coefficient of kinetic friction is 0.20, does a 15 kg box move if Mr. Comisky pushes on it with 45 N of force?
Yes
An dropped bowling ball feels a weight of 150 N and a drag of 100 N. What is the resulting net force on the bowling ball? Is the velocity constant or changing?
50 N; changing
A student is pushing a 90 kg box across the floor by applying a 387 N force to the right. The coefficient of static friction between the box and the floor is 0.4 and the coefficient of kinetic friction is 0.35. Neglecting drag, what is the box's acceleration?
0.867 m/s^2
A spherical object has mass of 18,000 kg and the other object's mass in unknown. They experience a gravitational force of 25 N towards one another. Their centers are .36 m apart. Determine the unknown mass.
2.7 x 10^6 kg