If a wooden block slides down an incline at a constant velocity, the force of friction must be equal to the
force perpendicular to incline
force parallel to incline
weight of the block
torque force
A box of weight W rests on a plane inclined at 30 degrees. What is the magnitude of the component of the weight that acts parallel to the incline?
0.50W
b 0.87W
W
1.5W
An empty wooden crate is slid across a warehouse floor. If the crate were filled, the coefficient of kinetic friction between the crate and the floor would
decreases
increases
remain the same
depend on how much the crate was filled
An empty wooden crate is slid across a warehouse floor. If the crate were filled, the force of kinetic friction between the crate and the floor would
decreases
increases
remain the same
depend on whether the Jets won the Super Bowl
A 5 N block with a surface area A is dragged across a horizontal wooden table and experiences a friction force of 2.0 N. What is the friction force acting on the 5 N block when the surface area is increased to 2A?
1.0 N
2.0 N
4.0 N
10. N
Which pair of quantities could be used to determine the coefficient of friction for granite on concrete?
mass and speed of the block
mass and normal force on the block
frictional force and speed of the block
frictional force and normal force on the block
The force required to start an object sliding across a uniform horizontal surface is larger than the force required to keep the object sliding at a constant velocity. These forces are different because the force of kinetic friction
is greater than the force of static friction
decreases as the speed of the object relative to the surface increases
increases as the speed of the object relative to the surface increases
is less than the force of static friction
A 50.N horizontal force is needed to keep an object weighing 500.N moving at a constant velocity of 2.0 m/s across a horizontal surface. The magnitude of the frictional force acting on the object is
500.N
0 N
450.N
50.N
A 20. N block slides over a horizontal table. If it takes a force of 5.0 N to move the block at constant velocity, what is the force of kinetic friction on the block ?
20. N
5.0 N
0.50 N
0.25 N
A 20. N block slides over a horizontal table. If it takes a force of 5.0 N to move the block at constant velocity, what is the coefficient of kinetic friction ?