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Unit 1. Newtonian Mechanics
II. Newton's Laws

1.A person drives a car in a straight line along a street. The speed of the car as a function of time t for a three second duration is shown in the above graph. This car moves to the right according to a stationary observer. Which of the following force vectors indicates the direction of the force applied on the driver by the seat of the car between t = 1 s and t = 3 s?
A
B
C
D
E
Questions 2 and 3 refer to the image below
 
2.What is the tension in the angled string?
Mg
mg
Mg + mg
Mg - mg
 
3.Now the hanging mass m is doubled, but the string attached to the ball is kept horizontal. How does the tension in the angled string change?
It increases by less than a factor of two.
It doubles.
It increases by more than a factor of two.
It decreases.
It does not change.
4.A 0.14 kg wooden block sits on a table. The coefficient of static friction between the block and the table is experimentally determined to be 0.25. Now, a 100 g mass is placed on top of the block. What is the coefficient of static friction between the block and the table now?
0.13
0.25
0.37
0.50
0.75
5.An aluminum block is pulled along the floor at constant speed by a rope with tension T. Which of the following is the Newton's third law companion force to the force of friction on the block?
the normal force on the table
the normal force on the block
the force of friction on the table
the tension in the rope
the force of gravity on the block
6.Two blocks, A and B, are connected by a light string around a pulley, as shown in the diagram above. The coefficient of friction between all surfaces in contact is μ. In the possible free-body diagrams below, N represents a normal force, and f represents a friction force. Which diagram best represents the direction of all the forces acting on block B?

A
B
C
D
7.A light ball is thrown upward into the air, reaching terminal velocity before coming back to the ground. Consider up to be the positive direction. Which of the following graphs could represent the ball's velocity as a function of time while it is in the air?

A
B
C
D
8.A 10 kg block on wheels is pulled along the ground by a pulling force P applied at a 60° angle above the ground. Friction is negligible. The block speeds up from 2.0 m/s to 4.0 m/s in 1.0 s. What is the magnitude of P?
40 N
20 N
80 N
100 N
400 N
9.The system of three blocks shown above is connected by light strings over massless pulleys. The surface is frictionless. What is the system’s acceleration?
10.A block of mass m slides down an incline with coefficient of kinetic friction μ . What is the block's acceleration down the plane?