Types of Forces
Name the force that opposes sliding.
Friction
What is the unit of Force?
N
An object is pushed to the right across a rough surface. The object moves at a constant velocity. Write an equation for the sum of forces in the x direction.
Fapplied - Ff = 0
A 60 kg glass object on a 20 degree glass ramp is accelerating down the ramp. What type of friction does the object experience? Static or kinetic?
Kinetic.
In tug of war, the right team pulls with a force of 900N, and the left team pulls with a force of 600N. The left team begins to accelerate toward the right as a result. If the mass of the left team is 120kg, what is the acceleration of the left team?
2.5 m/s2
Which force deals with strings?
Tension
What is the unit of mass?
kg
An object is on a flat, rough surface. It is then pushed by a person with a force that is exerted down and to the right, at an angle below the horizontal. The object accelerates in the x direction. Write an equation for the sum of forces in the x direction.
Fapplied,x - Ff = ma
Calculate the static friction (Fs,max) and the kinetic friction (Fk) this object will experience.
Fs = 653N
Fk = 503N
A 10kg object is pulled down the hall. If you pull with an applied force of 110N at 14 degrees above the horizontal, what is the normal force on the object?
71.4N
Name the force associated with physically pushing/pulling an object.
Applied Force
What is the unit of acceleration?
m/s2
An object is on a flat, rough surface. It is then pushed by a person with a force that is exerted down and to the right, at an angle below the horizontal. The object accelerates in the x direction only. Write an equation for the sum of forces in the y direction.
Fn - Fapplied,y - Fg = 0
A 15kg object is pushed along a flat ground with an applied force of 119N. The object moves with constant speed. What is the composition of the object and the floor?
Rubber and dry concrete.
A piece of lubricated metal is placed on another piece of lubricated metal.Two people push to the right on the metal, with an applied forces of 22N and 33N, and the metal moves at a constant speed. What is the normal force on the metal?
916.7 N
Name the force that is the same as "Weight"
Force of Gravity
What is the unit of the force of static friction?
N
An object is sitting still on a rough ramp. Write an equation for the sum of the forces in the x direction.
Fgx - Ff = 0
OR
Ff - Fgx = 0
Depending on Direction of Ramp
A 60 kg object on a 20 degree ramp is stationary. Calculate the force of friction. You do not need the coefficient of friction to solve this question.
201 N
A 1.2kg block of ice is placed on top of a 20 degree ramp made of ice, and it doesn't move. What is the frictional force on the block of ice?
1.11N
Name the force that is always perpendicular to a surface.
Normal Force.
What is the unit of the coefficient of friction?
No units.
An object is being pulled up a rough ramp, and it accelerates in the same direction in which it is being pulled. Write an equation for the sum of forces in the x direction.
Fapplied - Ff - Fgx = ma
OR
Ff + Fgx - Fapplied = m(-a)
Depending on the direction the ramp is drawn.
A 60 kg glass object on a 20 degree glass ramp is accelerating down the ramp. Calculate the force of friction.
221.2N
A 11kg aluminum object is placed on a 37 degree steel ramp. What is the acceleration of the object down the ramp?
2.22 m/s2 down the ramp.