PHYS 1405: Exam 1 Question and
answers rated A+ 2025/2026
Suppose you are driving north and suddenly hit your brakes to avoid a dog in the road. As you come to a
stop your acceleration is directed
A. North
B. South
C. Nowhere because acceleration is a scalar
D. Downwards - correct answer ✔B. South
You were in a spaceship and fired a cannonball into frictionless, empty space, how much force would
have to be exerted on the ball to keep it going after it left your ship?
A. A force equal to the cannonball's mass
B. A force equal to the cannonball's momentum.
C. A force equal to the cannonball's velocity.
D. Zero force. - correct answer ✔D. Zero force
,In your car, there is a headrest at the top of your seat to help protect you. The headrest is most
important when
A. you are moving forward and crash into a tree.
B. you go around a turn too quickly and your car rolls over.
C. you are stopped and another car hits you from behind.
D. you hit a patch of ice and your car continues to move forward at constant velocity. - correct answer
✔C. you are stopped and another car hits you from behind.
Suppose you have a car traveling down the road at constant speed and not changing direction. It is
experiencing gravity, wind resistance and frictional forces from the road. What can be said about the car
s acceleration?
A. It is accelerating because there are forces acting on it.
B. It accelerating because the motor is running, propelling the car forward.
C. It is not accelerating because gravity holds it down.
D. It is not accelerating because it has constant velocity. - correct answer ✔D. It is not accelerating
because it has constant velocity.
If you are backing up but slowing down, your acceleration is directed
, A. backwards
B. nowhere
C. forwards
D. to the left - correct answer ✔C. forwards
Suppose you throw a ball downwards with a certain initial speed from a certain height h above the
ground, and someone else throws a ball directly upward at the same speed, so the two balls collide. Will
the two balls collide in the middle of the path (h/2), above the middle or below?
A. Above the middle
B. Exactly in the middle
C. Below the middle
D. It depends on how much air resistance there is - correct answer ✔C. Below the middle
A gymnast jumps upward with an initial speed of 10 m/s. She is in the air for a total time of
A. 1 second
B. 5 seconds
answers rated A+ 2025/2026
Suppose you are driving north and suddenly hit your brakes to avoid a dog in the road. As you come to a
stop your acceleration is directed
A. North
B. South
C. Nowhere because acceleration is a scalar
D. Downwards - correct answer ✔B. South
You were in a spaceship and fired a cannonball into frictionless, empty space, how much force would
have to be exerted on the ball to keep it going after it left your ship?
A. A force equal to the cannonball's mass
B. A force equal to the cannonball's momentum.
C. A force equal to the cannonball's velocity.
D. Zero force. - correct answer ✔D. Zero force
,In your car, there is a headrest at the top of your seat to help protect you. The headrest is most
important when
A. you are moving forward and crash into a tree.
B. you go around a turn too quickly and your car rolls over.
C. you are stopped and another car hits you from behind.
D. you hit a patch of ice and your car continues to move forward at constant velocity. - correct answer
✔C. you are stopped and another car hits you from behind.
Suppose you have a car traveling down the road at constant speed and not changing direction. It is
experiencing gravity, wind resistance and frictional forces from the road. What can be said about the car
s acceleration?
A. It is accelerating because there are forces acting on it.
B. It accelerating because the motor is running, propelling the car forward.
C. It is not accelerating because gravity holds it down.
D. It is not accelerating because it has constant velocity. - correct answer ✔D. It is not accelerating
because it has constant velocity.
If you are backing up but slowing down, your acceleration is directed
, A. backwards
B. nowhere
C. forwards
D. to the left - correct answer ✔C. forwards
Suppose you throw a ball downwards with a certain initial speed from a certain height h above the
ground, and someone else throws a ball directly upward at the same speed, so the two balls collide. Will
the two balls collide in the middle of the path (h/2), above the middle or below?
A. Above the middle
B. Exactly in the middle
C. Below the middle
D. It depends on how much air resistance there is - correct answer ✔C. Below the middle
A gymnast jumps upward with an initial speed of 10 m/s. She is in the air for a total time of
A. 1 second
B. 5 seconds
