Honors Physics Midterm Review

True or False. The area under an acceleration-time graph curve represents change in velocity

T

True or False. The slope of velocity-time curve represents change in position

F

If a body traveling in a negative direction speeds up its acceleration is?

A.) Positive

B.) Negative

C.) Zero

B

When an object is thrown vertically into the air,its acceleration at the peak is?

A.)-4.9m/s/s

B.) -32m/s/s

C.) 0m/s/s

D.) -9.8m/s/s

D

A ball is thrown straight up. If up is positive, when during the flight is the acceleration of the ball negative?

A.) During the entire free flight

B.) Only on the way up

C.) Only at the peak

D.) Only on the way down

E.) None of the above

A

A ball is thrown straight up. If up is positive, when during the flight is the velocity negative?

A.) During the entire free flight

B.) Only on the way up

C.) Only at the peak

D.) Only on the way down

E.) None of the above

D

A ball is thrown up into the air at 20m/s. Approximately how much time elapses until the ball returns to the height from which it was thrown?

A.) 2s

B.) 3s

C.) 4s

D.) 6s

C

A student throws a baseball up into the air at 29.4 m/s. What is its maximum height above the student?

A.) 9.8m

B.) 19.6m

C.) 29.4m

D.) 44.1m

D

A rock is dropped from the top of a cliff. It it takes the rock 2.50s to reach the ground, what is the height of the cliff?

A.) 9.8m

B.) 12.3m

C.) 24.5m

D.) 30.6m

D

Two rocks are thrown from the top of a cliff. Rock A is thrown straight up at 10 m/s, and Rock B is thrown straight down at 10m/s. How do the speeds of the two rocks right before hitting the ground compare?

A.) Both rocks will hit the ground at the same speed

B.) Rock A is going faster when it hits the ground

C.) Rock B is going faster when it hits the ground

D.) No comparison can be made without knowing the height of the cliff

A

A woman walks 5.0 km east, 4.0 km north, and 2.0 km west in 3.0 hrs. Whats her average velocity?

A.) 1.2 km/hr 37 degrees north of east

B.) 1.7 km/hr 37 degrees north of east

C.) 1.2 km/hr 53 degrees north of east

D.) 1.7 km/hr 53 degrees north of east

D

A pilot wants to fly a plane east at a velocity of 400 km/hr with respect to the ground. A 50 km/hr wind is blowing southward. With respect to the air, what velocity must the pilot maintain?

A.) 397 km/hr at 82.8 degrees North of East

B.) 397 km/hr at 82.8 degrees South of East

C.) 403 km/hr at 71.3 degrees North of East

D.) 403 km/hr at 71.3 degrees South of East

C

Ignoring friction with the air, at what angle relative to the horizontal would a projectile travel the greatest horizontal distance if it starts and land at the same height?

A.) 15 degrees

B.) 30 degrees

C.) 45 degrees

D.) 60 degrees

C

A person throws a rock horizontally out of a window of a building with a speed of 10m/s. The window is 30 m above the ground. How far from the building will the rock strike the ground?

A.) 17.5m

B.) 24.7m

C.) 30.6m

D.) 61.2m

B

A cannon fires a 5 kg projectile at a velocity of 200m/s at an angle of 30 degrees above horizontal. What is the maximum height the projectile reaches?

A.) 510m

B.) 1020m

C.) 1770m

D.) 3530m

A

A boat crosses a 500 m wide river. The boat can maintain a maximum speed of 5 m/s. The speed of river current is 2 m/s. What is the fastest time the boat can go across the river?

A.) 250s

B.) 167s

C.) 109s

D.) 100s

D

A soccer player kicks a ball into the air toward the goal. Which statement best describes the vertical component of the ball's acceleration

A.) Acceleration increases then decreases

B.) Acceleration decreases then increases

C.) Acceleration increases

D.) Acceleration remains constant

D

If a ball is thrown horizontal at the same time another ball is dropped from the same height, how do their flight times compare?

A.) Both times are the same

B.) The horizontally thrown ball's time is greater

C.) The horizontally thrown ball's time is less

D.) The horizontally thrown ball's time is sometimes greater, sometimes less

A

A ball is thrown from a 9.8 meter high cliff with an initial velocity of 10 m/s at 60 degrees above horizontal. What is the vertical component of the ball's initial velocity?

A.) 10 m/s

B.) 8.66 m/s

C.) 5.77 m/s

D.) 5 m/s

B

A cannon ball is fired with a speed of 65 m/s at an angle of 40 degrees above horizontal. What is the initial horizontal velocity of the cannon ball?

A.) 65 m/s

B.) 54.5 m/s

C.) 49.8 m/s

D.) 41/8 m/s

C

A student kicks a football giving it an initial velocity of 24.4 m/s at an angle of 38 degrees above horizontal. How much time elapses before the ball returns to the ground?

A.) 1.53s

B.) 2.49s

C.) 3.06s

D.) 4.98s

C

A student kicks a football giving it an initial velocity of 24.4 m/s at an angle of 38 degrees above horizontal. How far from the student does the football land?

A.) 29.4 m

B.) 37.3 m

C.) 58.8 m

D.) 74.9 m

C

An archer shoots an arrow with his bow at an angle of 42 degree above horizontal. If the angle of elevation of the arrow is decreased from 42 degrees to 33 degrees while keeping the same initial speed, what happens to the components of the arrow's velocity?

A.) Its vertical component increases and its horizontal component increases

B.) Its vertical component increases and its horizontal component decreases

C.) Its vertical component decreases and its horizontal component decreases

D.) Its vertical component decreases and its horizontal component increases

D

A soccer ball that is initially at rest on the ground is kicked by a player, giving the ball an initial velocity of 18 m/s at an angle of 30 degrees above horizontal. What is the vertical velocity of the ball at the peak of its flight?

A.) 0m/s

B.) 0.92 m/s

C.) 9 m/s

D.) 15.6 m/s

A

A 70 kg person steps onto a bathroom scale in an elevator. As the elevator begins to move the person notices that the bathroom scale reads 630 N. From this information we can conclude that the elevator is:

A.) moving up at a constant velocity

B.) accelerating upward

C.) moving down at a constant velocity

D.) accelerating downward

D

Two forces are applied to an object in such a way that the force acting toward the right is greater than the force acting toward the left. If no other forces are acting on the object, which statement best describes the motion of the object?

A.) The object moves the right at a constant velocity

B.) The object moves the left at a constant velocity

C.) The object accelerates to the right

D.) The object accelerates to the left

C

A .40 kg object starts at rest and achieves a speed of 16m/s in 2 seconds. What average unbalanced force accelerates this object?

A.) 3.2 N

B.) 3.9 N

C.) 6.4 N

D.) 8.0 N

A

An object of mass m accelerates to the right with acceleration a when acted upon by a net force F. If the same net force F acts on a second object of mass 2m, then the acceleration of the second object must be:

A.) 2a

B.) a

C.) a/2

D.) a/4

C

A bucket of water that has a total mass of 2.5 kg is pulled straight up with a force of 32 N. What is the acceleration of the bucket of water?

A.) 3 m/s/s

B.) 7.5 m/s/s

C.) 9.8 m/s/s

D.) 12.8 m/s/s

A

In the previous question, if the angle is decreased while the pull force remains the same, which statement best describes the effect this change will have on the motion of the block?

A.) The acceleration will remain the same

B.) The acceleration will increase

C.) The acceleration will decrease

D.) The acceleration will become zero

B

A 1.5 kg wooden block is pulled across a horizontal surface by a horizontal force of 4.5 N at a constant velocity of 3 m/s. What is the magnitude of the force of friction?

A.) 0 N

B.) 3 N

C.) 3.4 N

D.) 15 N

C

A block is initially at rest on a inclined plane. Suppose the angle of the incline is increased slightly. Which statement best describes the motion of the block on this steeper incline?

A.) The block will slide down the incline at a constant velocity

B.) The block will accelerate down the incline

C.) The block may remain at rest

D.) The black may accelerate up the incline

C

A wooden block has dimensions of 5 cm x 10 cm x 10 cm. The wooden block is placed on a lab bench so that the side that has dimensions of 10 cm x 10 cm is in contact with the bench. A horizontal force of 6.0 N is needed to pull the block across the lab bench at a constant speed. If the block is instead placed on the same lab bench so that the side that has dimensions of 5 cm x 10 cm is in contact with the bench, what force will be needed to pull the block at a constant speed?

A.) 1.5 N

B.) 3 N

C.) 6 N

D.) 9 N

C

A horizontal force of 10 N is needed to slide a 10 kg box across the floor at a constant speed. What is the value of the coefficient of kinetic friction?

A.) 0.010

B.) 0.10

C.) 1.0

D.) 10

B

John is pushing a 50 kg cart at a constant velocity along a horizontal floor with a horizontal force of 200 N. What is the magnitude of the frictional force that the cart is experiencing?

A.) 100 N

B.) 150 N

C.) 200 N

D.) 250 N

C

A 110 kg automobile crash test dummy is seated 0.30 m from a car's steering wheel. If the car hits a barrier at 15 m/s, approximately what force must be the seat belt exert on the dummy to prevent impact with the steering wheel?

A.) 7.3 N

B.) 110 N

C.) 1700 N

D.) 41000 N

D