NEW
Font size
WorksheetsPhysics C F=ma Review
Total questions: 13
Worksheet time: 14mins
A block of mass 10 kg initially at rest is pushed against a wall by a 100 N force as shown. The coefficient of kinetic fricton is .25 while the coefficient of static friction is .45. If the block is pushed up the wall by the force, which is true of the friction acting on the block after a time of 1 second?
Kinetic friction acts downward on the block.
Static friction acts upward on the block.
Static friction acts downward on the block.
Kinetic friction acts upward on the block.
A skier slides at constant speed down an incline an angle of phi to the horizontal. What is the coefficient of friction?
tanϕ
cosϕ
cotϕ
cscϕ
A sign of mass M is hung from two massless strings as shown. Both strings are fixed to the ceiling and make a 30 degree angle with the ceiling, as shown. Determine an expression for the tension in each string.
Mg
Mg/2
3Mg/2
Mg/4
The horizontal surface on which the objects shown above slide is frictionless. If M = 2.0 kg, and the tension in string 2 is 12 N, calculate the value of F.
20 N
25 N
30 N
40 N
A block of mass is pulled across a rough horizontal surface at constant speed by a force of magnitude F, which acts at anangle of to the horizontal, as shown. Which of the following represents the coefficient of friction between the block and the surface?
mg−FcosθFsinθ
mg−FsinθFcosθ
Fcosθ−mgFsinθ
mg+FsinθFcosθ
The figure on the right shows blocks A and B on a horizontal surface in contact with each other. A force F is applied to block A. The choices below give different options for the masses of blocks and A (MA) and B (MB). For which configuration does B apply a force of magnitude F/3 on block A?
A: 1 kg B: 3 kg
A: 2 kg B: 1 kg
A: 1 kg B: 2 kg
A: 4 kg B: 3 kg
A block of mass slides along a frictionless surface towards an incline as shown. Once on the incline, the block has a resistive force of kv acting against it. Does it take the block longer to travel up the incline or to travel down the incline?
It takes the block longer to slide up the incline to its max height.
It takes the block longer to slide down from its max height back to the bottom of the incline.
It takes the block the same amount of time to slide up and the incline and back down the incline.
Cannot be determined without knowing the value k.
A car is traveling along a straight, level road when it runs out of gas at time t = 0. From this time on, the net force on the car is a resistive force of -kv, where ν is velocity and k is a constant. Which of the following pairs of graphs best represents the speed υ and position x of the car as functions of time after t = 0?
A car is traveling in a horizontal circle as shown. At the instant shown, the car is speeding up. Which of the following vectors best represents the direction of the net force on the car?
A block of mass m is placed against the wall of a cylinder of radius R that rotates at a constant angular velocity ω. In order for friction to prevent the mass from sliding down the wall, μ must satisfy which of the following?
μ≥gω2R
μ≤gω2R
μ≥ω2Rg
μ≤ω2Rg
A bob of mass 1.0 kg is swung at the end of 2.0 m long string in a conical pendulum as shown. The string makes an angle of 20 degrees with the vertical. Find the speed of the bob’s circular motion.
3.6 m/s
2.4 m/s
7.4 m/s
1.6 m/s
If F = 5.0 N, what is the magnitude of the force exerted by block 2 on block 1?
17 N
19 N
21 N
5 N
An object attached to the end of a string swings in a vertical circle (R = 1.2 m), as shown. At an instant when q = 30°, the speed of the object is 5.1 m/s and the tension in the string has a magnitude of 20 N. What is the mass of the object?
2.0 kg
1.8 kg
1.2 kg
0.8 kg
