Free Body Diagrams
If a book is sitting on the table, not moving, what force(s) are acting on the book?
Gravity, Normal Force
A car is accelerating at 20 m/s2. If the mass of the car is 1000 kg, what is the force acting on the car?
F = 20,000 N
What is the momentum of a box that has a mass of 10 kg and is traveling at a velocity of 5 m/s?
p = 50 kg*m/s
m1 = 100 kg
v1 = 20 m/s
m2 = 40 kg
v2 = ?
v2 = 50 m/s
If a book was pushed to the left 10 N, what is the net force with direction?
10 N to the left.
If a car is on the floor and a child pushed it forward, what force(s) are acting on the car?
Gravity, Normal Force, Applied Force/Push Force, Friction Force
A box is pushed with a force of 25 N. If the acceleration at which the box is moving is 5 m/s2, what is the mass of the box?
m = 5 kg
What is the mass of a car that has a momentum of 2000 kg*m/s and is traveling at a velocity of 40 m/s?
m = 50 kg
m1 = 20 kg
v1 = 50 m/s
m2 = ?
v2 = 10 m/s
m2 = 100 kg
A box is pushed 5 N to the right with a friction force of 2 N. What is the net force with direction?
3 N to the right
A rock falls from 1000 meters in a vacuum (no air resistance), what force(s) are acting on the rock?
Gravity
A 2 kg toy car is being pushed with a force of 16 N. What is the acceleration of the car?
a = 8 m/s2
What is the velocity of a 1500 kg truck that has a momentum of 450,000 kg*m/s
v = 300 m/s
The following forces are acting on a box:
Fg = 15 N
FN - 15 N
FA = 7 N Right
What is the net force with direction?
7 N to the right
A child pushes a block across the floor with 5 N. There is a force pushing back making it more difficult to push the block. What force(s) are acting on the box?
Gravity, Normal Force, Applied/Push Force, Friction Force
A box is being pushed 6 N to the left with a friction force 2 N to the right. If the acceleration of the box is 2 m/s2, what is the mass of the box?
m = 2 kg
If a car and a person together have a mass of 900 kg, what is the momentum of the if the 100 kg person gets out and the car travels at a velocity of 20 m/s?
p = 16,000 kg*m/s
A bicyclist and his bike have a mass of 175 kg and is traveling at 15 m/s. If the bike crashes into another cyclist and their velocity is 20 m/s, what is the mass of the second cyclists and her bike?
m2 = 131 kg
The following forces are acting on a box:
Fg = 95 N
FN = 105 N
FA = 10 N
Ff = 10 N
What is the net force with direction?
10 N up
During Tug-of-war, a child is pulling on the rope with all his might. What force(s) are acting on the system?
Gravity, Normal Force, Tension Force, Friction Force
A 900 kg car is traveling with a velocity of 50 m/s. If it take 10 seconds to get to the destination, what is the force?
4,500 N
What is the mass of a dog that traveled 100 m in 5 seconds and has a momentum of 400 kg*m/s?
m = 20 kg
A 120 kg person ran 500 meters in 90 seconds before he crashes into another runner who has a mass of 135 kg. What is the velocity of the second person?
v2 = 4.9 m/s
A box has a gravitational force of 45 N and a normal force of 45 N. A child is pushing the box to the right with a force of 10 N while another child is pulling the box to the right with a force of 7 N. If there is a friction force of 4 N to the left, what is the net force with direction?
F = 13 N to the right