PHY Exam 1

A constant force is applied to an object, causing the object to accelerate at 5 m/s^2. What will it be if the force is doubled?
A) 1.25m/s^2
B) 2.5m/s^2
C) 5m/s^2
D) 10m/s^2

D) 10 m/s^2

A constant force is applied to an object, causing the object to accelerate at 5 m/s^2. What will the acceleration be if the force and mass are both halved?
A) 1.5 m/s^2
B) 2.5 m/s^2
C) 5 m/s^2
D) 10 m/s^2

C) 5 m/s^2

An object is moving to the left with constant velocity. The net force on the object must be...
A) to the left
B) zero
C) double the mass
D) to the right

B) Zero

A physics textbook is at rest on a desk. Compared to the weight of the textbook, the normal force on the textbook is...
A) less than the weight
B) zero
C) equal to the weight
D) greater than the weight

C) Equal to the weight

An exhausted student falls asleep on their physics textbook that is at rest on the desk. Compared to the weight of the textbook, the normal force on the textbook is...
A) less than the weight
B) zero
C) equal to the weight
D) greater than the weight

D) greater than the weight

An astronauts weight on earth is 1000 N. What is their weight on the Moon where g= 1.6 m/s^2?
A) 100 N
B) 160 N
C) 620 N
D) 1000 N

W=ma
B) 160 N

A 100 kg block is at rest on a 15 degree slope. How big is the friction on the block?
A) 0 N
B) 25 N
C) 250 N
D) 1000 N

C) 250 N

A 100 kg block hangs from a rope. What is the tension in the rope if the box moves up at a steady 5.0 m/s^2?
A) 50 N
B) 500 N
C) 1000 N
D) 1500 N

1000 N