Physics Unit 1 Practice Exam
a 10 kg block with an initial velocity of 10 m/s slides 10 meters across a horizontal surface and comes to rest. It takes the block 2 seconds to stop. the stopping force acting on the block is about
50 N
a bullet is fired straight down from the top of a high cliff. neglecting air resistance, the approximate acceleration of the bullet in meters per second per second is...
about 10
If you drop an object, it will accelerate downward at a rate of about 10 meters per second per second. If you instead throw it downwards, its acceleration (in the absence of air resistance) will be...
about 10 meters per second per second
a skydiver steps from a helicopter and falls for a few seconds until he reaches his terminal velocity. thereafter, until he opens his parachute, his acceleration....
is zero
a ball thrown straight upward takes 10 seconds to go up and return to the ground. because of air resistance, the time taken for the ball just to go up is...
less than 5 s
a kilogram is a measure of an objects:
mass
during the time of the year when the earth starts moving closer to the sun, the sun...
moves toward the earth, but a smaller distance
a horce exerts 500 N of force on a heavy wagon. the wagon pulls back on the horse with an equal force. the wagon still accelerates because...
nevertheless there is still an unbalanced force on the wagon
if more horizontal force is applied to a sliding object than is needed to maintain a constant velocity...
the object accelerates in the direction of the applied force
a feather and a coin will have equal accelerations when falling in a vacuum because...
the ratio of each object's weights to its mass is the same
compared to the mass of a certain object on Earth, the mass of the same object on the moon is...
the same.
when a rock thrown straight upwards gets to the exact top of its path, its...
velocity is zero and its acceleration is about 10 meters per second per second
a mack truck and a volkswagen traveling at the same speed have a head-on collision. the vehicle that undergoes the greatest change in velocity will be the...
volkswagen
when a falling object has reached its terminal velocity, its acceleration is...
zero
A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected, the force required to keep the puck sliding at constant velocity is...
zero.
Which of the following is not a vector quantity: a. speed b. velocity c. acceleration
a. speed
the vertical height attained by a basketball player who achieves a hang time of a full 1 s is...
about 1.25 m
an apple at rest weighs 1 N. the net force on the apple when it is in free fall is...
1 N
a 1 kg mass at the earth's surface weighs about...
10 N
a man leans over the edge of a cliff and throws a rock upward at 5 m/s. how far below the level from which is was thrown is the rock 2 seconds later?
10 m
a 10 kg brick and a 1 kg book are dropped in a vacuum. The force of gravity on the 10 kg brick is...
10 times as much
what horizontally applied force will accelerate a 400 kg crate at 1 m/s/s across a factory floor against a friction force half its weight?
2400 N
an object falls freely from rest on a planet where the acceleration due to gravity is twice as much as it is on Earth. In the first 5 seconds it falls a distance of...
250 m
If experimental findings are not reproducible...
The results are not considered valid
a bag of groceries has a mass of 10 kilograms and a weight of...
about 100 N
a ball is thrown upwards. Neglecting air resistance, what initial upward speed does the ball need to remain in the air for a total time of 10 seconds?
about 50 m/s
a ball tossed vertically upward rises, reaches its highest point, and then falls back to its starting point. During this time the acceleration of the ball is always...
directed downward