RIO SALADO - PHY 111 Midterm 1 QUESTIONS WITH
COMPLETE SOLUTIONS
A 500 kg rollercoaster car starts from rest at the top of a 10.0 m
tall hill. It then travels down the track and up a loop. The top of
the loop is 7.0 m from the ground. What is the speed of the
rollercoaster car at the top of the loop assuming negligible
friction losses? Correct Answers 7.7 m/s
A ball is attached to the center of the ceiling inside of a van
moving at constant speed. If the ball is released, where will the
ball land? Correct Answers Directly below its starting position
(middle of the van)
A box moving on a horizontal surface with an initial velocity of
20 m/s slows to a stop over a time period of 5.0 seconds due
solely to the effects of friction. What is the coefficient of kinetic
friction between the box and the ground? Correct Answers 0.41
A car accelerates from rest at a rate of 20 m/s2. How far will the
car have traveled by the time it reaches a speed of 30 m/s?
Correct Answers 22.5 m
A car moving at a constant 25 m/s travels for 3.0 seconds. What
is the distance traveled by the car? Correct Answers 75 m
A car travels at a constant speed up a hill from point A to point
B as shown in the diagram below. Which of the following
statements is most correct? Correct Answers The gravitational
energy increases, and the kinetic energy remains the same.
, A car travels forwards at a constant speed of 30 m/s for 5.0
seconds. How far will the car move in this time? Correct
Answers 150 m
A jogger starts at a position of 4.0 m and moves forwards at a
constant rate ending at a position of 12.0 m at a time 4.0 s later.
What is the speed of the jogger? Correct Answers 2.0 m/s
A large truck moving at 30 mph collides with a parked car. How
does the force of the truck on the car compare to the force of the
car on the truck? Correct Answers The force of the truck on the
car is equal to the force of the car on the truck.
A medium-sized air conditioning unit is rated at 900 W. How
much energy will the AC unit require in order to operate for 2.0
hours? Correct Answers 6.48x106 J
A negative acceleration indicates that an object might be
Correct Answers moving forward while slowing down.
A student applies a 147 N force at an angle 30° below the
horizontal to a 15.0 kg box at rest on the ground. The coefficient
of static friction is 0.7, and the coefficient of kinetic friction is
0.5. Describe the motion of the box. Correct Answers The box
will remain motionless.
A student applies a horizontal force of 100 N to a 25 kg box
causing the block to accelerate at a rate of 1.5 m/s/s. Which of
the following is the best approximation of the magnitude of the
friction force on the box? Correct Answers 63 N
COMPLETE SOLUTIONS
A 500 kg rollercoaster car starts from rest at the top of a 10.0 m
tall hill. It then travels down the track and up a loop. The top of
the loop is 7.0 m from the ground. What is the speed of the
rollercoaster car at the top of the loop assuming negligible
friction losses? Correct Answers 7.7 m/s
A ball is attached to the center of the ceiling inside of a van
moving at constant speed. If the ball is released, where will the
ball land? Correct Answers Directly below its starting position
(middle of the van)
A box moving on a horizontal surface with an initial velocity of
20 m/s slows to a stop over a time period of 5.0 seconds due
solely to the effects of friction. What is the coefficient of kinetic
friction between the box and the ground? Correct Answers 0.41
A car accelerates from rest at a rate of 20 m/s2. How far will the
car have traveled by the time it reaches a speed of 30 m/s?
Correct Answers 22.5 m
A car moving at a constant 25 m/s travels for 3.0 seconds. What
is the distance traveled by the car? Correct Answers 75 m
A car travels at a constant speed up a hill from point A to point
B as shown in the diagram below. Which of the following
statements is most correct? Correct Answers The gravitational
energy increases, and the kinetic energy remains the same.
, A car travels forwards at a constant speed of 30 m/s for 5.0
seconds. How far will the car move in this time? Correct
Answers 150 m
A jogger starts at a position of 4.0 m and moves forwards at a
constant rate ending at a position of 12.0 m at a time 4.0 s later.
What is the speed of the jogger? Correct Answers 2.0 m/s
A large truck moving at 30 mph collides with a parked car. How
does the force of the truck on the car compare to the force of the
car on the truck? Correct Answers The force of the truck on the
car is equal to the force of the car on the truck.
A medium-sized air conditioning unit is rated at 900 W. How
much energy will the AC unit require in order to operate for 2.0
hours? Correct Answers 6.48x106 J
A negative acceleration indicates that an object might be
Correct Answers moving forward while slowing down.
A student applies a 147 N force at an angle 30° below the
horizontal to a 15.0 kg box at rest on the ground. The coefficient
of static friction is 0.7, and the coefficient of kinetic friction is
0.5. Describe the motion of the box. Correct Answers The box
will remain motionless.
A student applies a horizontal force of 100 N to a 25 kg box
causing the block to accelerate at a rate of 1.5 m/s/s. Which of
the following is the best approximation of the magnitude of the
friction force on the box? Correct Answers 63 N
