If the force of gravity suddenly stopped acting on the planets, they would
A) continue to orbit the sun.
B) fly straight away from the sun.
C) move in a straight line tangent to their orbit.
D) spiral slowly away from the sun.
E) spiral slowly towards the
move in a straight line tangent to their orbit.
One object has twice as much mass as another object. The first object also has twice as much
A) inertia.
B) velocity.
C) gravitational acceleration.
D) energy.
E) all of the above
inertia.
You would have the largest mass of gold if your chunk of gold weighed 1 N (W = mg) on the
A) Moon (g = 1.62 m/s2)
B) Earth (g = 9.81 m/s2)
C) Jupiter (g = 25.95 m/s2)
D) Mars (g = 3.77 m/s2)
A) Moon (g = 1.62 m/s2)
A 100.00 N lantern is suspended by a rope . The tension in the rope is
A) 100.0 N.
B) 100 N.
C) 100. N
D) 100.00 N
D) 100.00 N
An apple weighs 1 N. The net force on the apple when it is in free fall is (Assume no air resistance)
A) 0 N.
B) 0.1 N.
C) 1 N.
D) 9.8 N.
E) none of the above
C) 1 N.
A car has a mass of 1000. kg and accelerates at 2.000 meters per second per second. What is the magnitude of the force acting on the car?
A) 500.0 N.
B) 1000. N.
C) 1500. N.
D) 2000. N.
D) 2000. N.
A tow truck exerts a force of 3000. N on a car, accelerating it at 2.000 m/s2. What is the mass of the car?
A) 500.0 kg
B) 1000. kg
C) 1500. kg
D) 3000. kg
C) 1500. kg
A block is dragged without acceleration in a straight-line path across a level surface by a force of 6 N. What is the frictional force between the block and the surface?
A) Less than 6 N
B) More than 6 N
C) 6 N
D) Need more information to say.
C) 6 N
Suppose a particle is accelerated through space by a constant 10-N force. Suddenly the particle encounters a second force of 10-N in a direction opposite to that of the first force. The particle
A) begins to decelerate and stop
B) continues to accelerate
C) continues at the speed it had when it encountered the second force.
. If you pull horizontally on a crate with a force of 150 N and the crate doesn't move, the friction force must be 150 N. Now if you pull with 250 N so the crate slides at constant velocity, the static friction force is
A) more than 150 N but less than 25
C) more than 250 N.
. You pull horizontally on a 50-kg crate with a force of 500 N, and the friction force on the crate is 250 N. The acceleration of the crate is
A) zero.
B) 2 m/s2.
C) 4 m/s2.
D) 5 m/s2.
D) 5 m/s2.
A speeding truck slams on its brakes and skids to a stop. If the truck's total mass were doubled, its skidding distance would be
A) half as far.
B) nearly as far, but not quite.
C) twice as far.
D) four times as far.
E) the same.
C) twice as far.
An unfortunate bug splatters against the windshield of a moving car. Compared to the deceleration of the car, the deceleration of the bug is
A) larger.
B) smaller.
C) the same.
A) larger.
14. Which of the following system of forces provides the block the highest net force?
a. 11 N 71 N
c. 227 N 153 N
b. 405 N 403 N
d. 22.7 N 15.3 N
c. 227 N 153 N
. According to Newton's third law, if you push gently on something, it will push
A) gently on you.
B) gently on something else.
C) on something only under the right conditions.
D) on you only if you aren't moving.
A) gently on you.
As an object falls freely in a vacuum, its
A) acceleration increases.
B) velocity increases.
C) both a and b
D) none of the above
B) velocity increases.
. A ball is thrown straight up. At the top of its path its instantaneous speed is
A) 0 m/s.
B) about 5 m/s.
C) about 10 m/s.
D) about 20 m/s.
E) about 50 m/s.
A) 0 m/s.
. A ball is thrown straight up. At the top of its path its acceleration is
A) 0 m/s/s.
B) about 5 m/s/s.
C) about 10 m/s/s.
D) about 20 m/s/s.
E) about 50 m/s/s.
C) about 10 m/s/s.
A ball is thrown upwards and caught when it comes back down. In the absence of air resistance, the speed of the ball when caught would be
A) more than the speed it had when thrown upwards.
B) less than the speed it had when thrown upwards.
C) the same as
C) the same as the speed it had when thrown upwards.
5. Human reaction time is usually about 0.20 s. If your lab partner holds a ruler between your finger and thumb and releases it without warning, how far can you expect the ruler to fall before you catch it? (Disregard air resistance. g = 9.81 m/s2.)
A) at
D) at least 19.6 cm
6. One-half second after starting from rest, a freely falling object will have a speed of about
A) 2.5 m/s.
B) 5 m/s.
C) 10 m/s.
D) 20 m/s.
E) none of the above
B) 5 m/s.
. If a freely falling object were somehow equipped with a speedometer, its speed reading would increase each second by
A) about 15 m/s.
B) about 10 m/s.
C) about 5 m/s.
D) a variable amount.
E) a rate that depends on its initial speed.
B) about 10 m/s.
. Suppose a jumper claims a hang time of 2 seconds. Then that jumper must be able to jump a vertical distance of about
A) 1 m.
B) 2 m.
C) 3 m.
D) 4 m.
E) 5 m.
E) 5 m.
If you drop a feather and a coin at the same time in a vacuum tube, which will reach the bottom of the tube first?
A) The coin
B) The feather
C) Neither�they will both reach the bottom at the same time.
C) Neither�they will both reach the bottom at the same time.
10. If a projectile is fired straight up at a speed of 10 m/s, the total time to return to its starting point is about
A) 1 second.
B) 2 seconds.
C) 10 seconds.
D) 20 seconds.
E) not enough information to estimate.
B) 2 seconds.
A car is moving with a uniform speed of 15.0 m/s along a straight path. What is the distance covered by the car in 12.0 minutes?
A. 1.02 x 10-3 km C. 8.00 x 10-5 km
B. 1.80 x 10-1 km D. 1.08 x 101 km
D. 1.08 x 101 km
What is the correct answer for the following problem? 5.300 / 3.1 =
A. 1.7 B. 1.71 C. 1.710 D. 1.7097 E. 2
A. 1.7
A man starts his car from rest and accelerates at 1 m/s2 for 2 seconds. He then continues at a constant velocity for 10 seconds until he sees a tree blocking the road and applies brakes. The car, decelerating at 1 m/s2, finally comes to rest. Which of the
/---\
A vector is a quantity that has
A. magnitude and time
B. magnitude and direction
C. time and direction
D. magnitude only
B. magnitude and direction
In the absence of air resistance, the angle at which a thrown ball will go the farthest is
A. 75 degrees
B. 60 degrees
C. 45 degrees
D. 30 degrees
E. 15 degrees
C. 45 degrees
A bullet fired horizontally hits the ground in 0.5 seconds. If it had been fired with a much higher speed in the same direction, it would have hit the ground (neglecting the earth's curvature and air resistance) in
A. less than 0.5 s
B. more than 0.5 s
C.
C. 0.5 s
At what part of a path does a projectile have minimum velocity?
A. When it is thrown.
B. Half-way to the top.
C. At the top of its path.
D. When it returns to the ground.
C. At the top of its path.
A ball is hurled into the air at an angle of 30 degrees and lands on a target that is at the same level as that where the ball started. The ball will also land on the target if it is thrown at an angle of
A. 40 degrees
B. 45 degrees
C. 55 degrees
D. 60 de
D. 60 degrees
The horizontal component of a projectile's velocity is independent of
A. the vertical component of its velocity
B. the range of the projectile
C. time
D. none of the above
A. the vertical component of its velocity
What is the resultant vector for the components Vx = 4.0, Vy = 7.0?
A. VR = 11, ? = 30�
B. VR = 8.1, ? = 30�
C. VR = 3.0, ? = 30�
D. VR = 11, ? = 60�
E. VR = 8.1, ? = 60�
E. VR = 8.1, ? = 60�
A cannonball is fired at some angle into the air. In the first second it moves 10.0 meters horizontally. Assuming it doesn't hit the ground, how far does it move horizontally in the next second?
A. More than 10.0 m
B. 10.0 m
C. Less than 10.0 m
D. There's
B. 10.0 m
A ball is thrown into the air at some angle. At the very top of the ball's path, its velocity is
A. entirely vertical.
B. entirely horizontal.
C. both vertical and horizontal.
D. There's not enough information given to determine.
B. entirely horizontal.
At what part of a path does a projectile have maximum speed?
A. When it is thrown
B. Half-way to the top
C. At the top of its path
D. When it returns to the ground
E. Both a and d
E. Both a and d
A ball is thrown straight upward at 10.0 m/s. Ideally (no air resistance), the ball will return to the thrower's hand with a speed of
A. 40.0 m/s.
B. 20.0 m/s.
C. 10.0 m/s.
D. 0 m/s.
A. 40.0 m/s.
An object is dropped and falls freely to the ground with an acceleration of 9.8 m/s2. If it is thrown upward at an angle instead, its acceleration would be
A. 0 m/s2
B. 9.8 m/s2downward.
C. 9.8 m/s2 upward.
D. larger than 9.8 m/s2
E. none of the above
B. 9.8 m/s2downward.
After a rock that is thrown straight up reaches the top of its path and is starting to fall back down, its acceleration is (neglect air resistance)
A. 0 m/s2
B. 4.9 m/s2
C. 9.8 m/s2
D. 19.6 m/s2
C. 9.8 m/s2
A ball thrown in the air will never go as far as physics ideally would predict because
A. one can never throw the ball fast enough.
B. gravity is acting.
C. ideally the ball would never land.
D. air resistance slows the ball.
D. air resistance slows the ball.
What are the components of a vector with a magnitude of 28.0 and an angle of 75�?
A. Vx = -7.25, Vy = 27.0
B. Vx = 7.25, Vy = 27.0
C. Vx = 27.0, Vy = 7.25
D. Vx = 27.0, Vy = -7.25
E. Vx = -27.0, Vy = -7.25
B. Vx = 7.25, Vy = 27.0
Human reaction time is usually about 0.20 s. If your lab partner holds a ruler between your finger and thumb and releases it without warning, how far can you expect the ruler to fall before you catch it? (Disregard air resistance. g = 9.81 m/s2.)
A. at le
D. at least 19.6 cm
A rifle with a muzzle velocity of 100 m/s is fired horizontally from a tower. Neglecting air resistance, where will the bullet be 1 second later?
A. 50 m downrange
B. 98 m downrange
C. 100 m downrange
D. 490 m downrange
E. none of the above
C. 100 m downrange
As an object falls freely in a vacuum, its
A. velocity increases.
B. acceleration increases.
C. both a and b
D. none of the above
A. velocity increases.
. If you lift two loads up one story, how much work do you do compared to lifting just one load up one story?
A) Four times as much
B) Twice as much
C) The same amount
D) One half as much
E) One quarter as much
B) Twice as much
Power is defined as the
A) force on an object times the distance the object moves.
B) force on an object divided by the time the force acts.
C) work done on an object divided by the time taken to do the work.
D) work done times the time it takes to do tha
C) work done on an object divided by the time taken to do the work.
. Potential energy is the energy an object has because of its
A) speed.
B) location.
C) size.
D) temperature.
E) density.
B) location.
4. Kinetic energy of an object is equal to
A) one half the product of its mass times its speed squared.
B) one half the product of its mass times its speed.
C) its mass multiplied by its speed.
D) its mass multiplied by its acceleration.
E) its mass multi
A) one half the product of its mass times its speed squared.
. How much farther will a car traveling at 100 km/s skid than the same car traveling at 50 km/s?
A) Five times as far
B) Four times as far
C) Twice as far
D) The same distance
E) Half as far
B) Four times as far
6. An arrow in a bow has 70 J of potential energy. Assuming no loss of energy due to heat, how much kinetic energy will it have after it has been shot?
A) 140 J
B) 70 J
C) 50 J
D) 35 J
E) 0 J
B) 70 J
Energy is changed from one form to another with no net loss or gain.
A) Always true
B) Sometimes true
C) Always false
A) Always true
8. A job is done slowly, and an identical job is done quickly. Both jobs require the same amount of work but different amounts of
A) energy.
B) power.
C) both a and b
D) none of the above
B) power.
9. A ball is thrown into the air with 100 J of kinetic energy which is transformed to gravitational potential energy at the top of its trajectory. When it returns to its original level after encountering air resistance, its kinetic energy is
A) less than
A) less than 100 J.
10. Two physics students, Will N. Andable and Ben Pumpiniron, are in the weightlifting room. Will lifts the 100-pound barbell over his head 10 times in one minute; Ben lifts the 100-pound barbell over his head 10 times in 10 seconds. Which student does th
C) They both do the same amount of work
11. Using the information from question 11, which student delivers the most power?
A) Will does
B) Ben does
C) They both use the same amount of power
B) Ben does
12. During a physics lab, Jack and Jill ran up a hill. Jack is twice as massive as Jill; yet Jill ascends the same distance in half the time. Who did the most work?
A) Jack
B) Jill
A) Jack
A tired squirrel (mass of approximately 1 kg) does push-ups by applying a force to elevate its center-of-mass by 5.0 cm in order to do a mere 0.50 Joule of work. If the tired squirrel does all this work in 2.0 seconds, then determine its power.
a. 5 J b.
c. 0.25 W
2.) When doing a chin-up, a physics student lifts her 42.00 kg body a distance of 0.2500 meters in 2.000 seconds. What is the work done by the student's biceps?
a. 10.5 N b. 102.9 J c. 102.9 W d. 51.45 W
b. 102.9 J
3.) Ben Travlun carries a 200. N suitcase up three flights of stairs, a height of 10.0 m, and then pushes it with a horizontal force of 50.0 N at a constant speed of 0.500 m/s for a horizontal distance of 35.0 meters. How much work does Ben do on his suit
b. 3750 J
4.) A 60. kg skydiver leaps out of an airplane at an altitude of 2000. m. Assuming an initial velocity equal to zero and neglecting air resistance, what would be his speed at an altitude of 1000. m using the conservation of mechanical energy?
a. 140 m/s b
a. 140 m/s
An 80.0 kg baseball player begins a slide into third base when moving at a speed of 5.00 m/s. The coefficient of friction between his body and the dirt is 0.650. He slides such that he stops just as he reaches the base.
5.) How far did he slide?
a. 5.0 m
c. 1.96 m
An 80.0 kg baseball player begins a slide into third base when moving at a speed of 5.00 m/s. The coefficient of friction between his body and the dirt is 0.650. He slides such that he stops just as he reaches the base.
6.) How much work was done by frict
b. 1020 J