unit 1
1. A skydiver jumps from a helicopter hovering at high altitude. /1
If we ignore the air resistance, how fast would she be falling
2.2 s after jumping?v
A. 1.6 m/s
B. 9.8 m/s
C. 36 m/s
D. 21.56 m/s
D. 21.56 m/s
Five groups of four-vectors are shown. All magnitudes of individual vectors are equal. The four vectors were added together.
Which of the following groups of vectors are correctly ranked from the greatest-to-least resultant magnitudes?
A. P > Q > S > R > T
B. Q > P = R > S > T
C. Q > P > R = S > T
D. S > Q > P > R > T
C. Q > P > R = S > T.
1)A student pushes a cart with a constant force of 20 N. The cart has a mass of 10 kg. Using
Newton’s Laws, which explanation best describes how the force affects the cart’s acceleration?
A. The cart will not accelerate because the force is balanced.
B. The cart accelerates at 2 m/s² because acceleration depends on both force and mass.
C. The cart accelerates at 20 m/s² because acceleration equals the applied force.
D. The cart moves at a constant velocity because Newton’s First Law says objects resist
changes in motion.
B. The cart accelerates at 2 m/s² because acceleration depends on both force and mass.
1) A box of mass 10 kg is pulled to the right with a force of 40 N, while friction
resists with 10 N to the left. Which Free Body Diagram description is correct?
a) The forces are balanced, so the box does not move.
b) The net force is 30 N to the right, so the box accelerates rightward.
c) The net force is 50 N to the right, so the box accelerates faster.
d) The forces cancel out, so the box remains at rest.
b) The net force is 30 N to the right, so the box accelerates rightward.
As a ball falls freely(without friction) toward the ground, its total mechanical energy
A) decreases
B) Cant be determined
C) Remains the same
D) increases
C) Remain the same
2. My teacher walks to East, 25-m along the E Hall in13-s. They turn /1
around and walk 5-m to the left in 2.0-s. What is the average
speed and the average velocity? (V represents average
speed and
��V represents average velocity)
A. V=2.0 m/s; ��V = 2.0 m/s
A. V=2.0 m/s; ��V = 1.33 m/s
A. V=1.92 m/s; ��V = 2.5 m/s
A. V=1.53 m/s; ��V = 1.8 m/s
A. V=2.0 m/s; ��V = 1.33 m/s
2.Use the information and vector to answer the following question.
Vector AB describes the velocity of a sailboat on Lake Lanier. The scale on each axis is in kilometers per hour.
What are the vector components, x and y, for the resultant vector AB?
A. x = 20 km/h; y = 15 km/h
B. x = 20 km/h; y = 25 km/h
C. x = 25 km/h; y = 15 km/h
D. x = 25 km/h; y = 20 km/h
D. x = 25 km/h; y = 20 km/h
2) If the net force on an object is zero, what would be its
acceleration?
A. Less than zero
B. Exactly zero
C. More than zero
D. It could be more or less depending on the situation
B. Exactly zero
2) An object of mass 5 kg rests on a frictionless inclined plane at an angle of 30°. Which forces
should be shown in its free body diagram?
A. Weight acting vertically downward and normal force perpendicular to the plane
B. Weight acting perpendicular to the plane and normal force vertically upward
C. Normal force and friction both acting downward
D. Only weight acting downward
A. Weight acting vertically downward and normal force perpendicular to the plane
2. The diagram below shows three positions, A, B, and C, in the swing of a pendulum, released from rest at point A. [Neglect friction.] Which statement is true about this swinging pendulum?
A) the potential energy at B equals the potential energy at C
B) the speed of the pendulum at A equals the speed of the pendulum at B
C) the potential energy at A equals the kinetic energy at B
D) the potential energy at A equals the kinetic energy at C
C) the potential energy at A equals the kinetic energy at B
3. What is the displacement of a car with an acceleration of 2.00 m/s2 /1
as it increases its speed from 5.0 m/s to 15.0 m/s?
A. 83 m
B. 20.41m
C. 3.57 m
A. 83 m
3. Which of the following variables would you need in order to calculate how long it would take a horizontally launched projectile to hit the ground?
A. The horizontal velocity and the height of the object
B. The height and the weight of the object
C. Only the horizontal velocity of the object
D. Only the height of the object
D. Only the height of the object
3)A hockey puck slides across a smooth ice surface. Suddenly, the player stops applying force
with the stick. According to Newton’s 1st Law (principle of inertia), what will happen to the
puck’s motion, and why?
a) The puck will immediately stop because no force is acting on it.
b) The puck will continue moving at the same speed and direction until another force acts
on it.
c) The puck will gradually speed up because inertia increases when no force is applied.
d) The puck will change direction on its own due to the absence of force.
b) The puck will continue moving at the same speed and direction until another force acts on it.
3) If an object is sliding down an inclined plane with friction, which direction does the
friction force point in the free body diagram?
A. Down the incline, opposite to motion
B. Up the incline, opposite to motion
C. Perpendicular to the incline, toward the surface
D. Vertically upward
B. Up the incline, opposite to motion
3. A student throws a stone upward at an angle of 45 degrees. Which statement best describes the stone at the highest point that it reaches?
a) Its potential energy is at a minimum. c) Its acceleration is at maximum
b) Its kinetic energy is at a minimum. d) Its acceleration is zero.
b) Its kinetic energy is at a minimum.
1. An athlete runs around a track that is 600 meters in 30 /1
minutes . What is the athlete's average speed and velocity during
this race?
Average speed was 20 m/s; average velocity was 0 m/s
Average speed was 20 m/s; average velocity was 20 m/s
C. Average speed was 8.403 m/s; average velocity was 0 m/s
D. Average speed was 8.403 m/s; average velocity was 8.403 m/s
C. Average speed was 8.403 m/s; average velocity was 0 m/s
4.A cannonball is launched horizontally with an initial velocity of 50 m/s off a 100 m tall cliff. The goal is to have the cannonball travel a target range of 400 m. Based on the information provided, will the cannonball reach the target distance?
A. yes, the cannonball will hit its goal
B. no, the cannonball will overshoot its goal
C. no, the cannonball will fall short of the goal
D. more information is needed to determine the outcome
C. no, the cannonball will fall short of the goal
4) When the net force acting on an object is zero, what will its acceleration be?
a) Negative (less than zero)
b) Zero (no acceleration)
c) Positive (greater than zero)
d) It may vary depending on the circumstances
b) Zero (no acceleration)
4) A 5 kg mass hangs from a rope. What is the tension in the rope if the mass is at rest?
a) 24.5 N
b) 5.0 N
c) 49.0 N
d) 9.8 N
c) 49.0 N
4. A 1.0-kilogram rubber ball traveling east at 4.0 meters per second hits a wall and bounces back toward the west at 2.0 meters per second. Compared to the kinetic energy of the ball before it hits the wall, the kinetic energy of the ball after it bounces off the wall is
a) one-half as great b) one-fourth as great c) four times as great
d) the same
a) one-half as great
which of the following interpretation describe the motion of the train over time
A. It moves at a constant velocity for the first 20 s, then it stops for the
last 20 s.
B. It moves with an acceleration for the first 20 s, then it stops for the
last 20 s.
C. It moves with a constant velocity for the first 20 s, then it moves at a
constant velocity for the last 20 s.
D. It moves with an acceleration for the first 20 s, then it moves at a constant
velocity for the last 20 s.
D. It moves with an acceleration for the first 20 s, then it moves at a constant
velocity for the last 20 s.
5. A student attempts to hit a tennis ball over a net that is 1 m high. Neglecting air resistance, what is the fastest speed at which a tennis ball can cross the net horizontally and still land in the court if the end line is 12 m away?
A. 0.04 m/s
B. 27 m/s
C. 45 m/s
D. 53 m/s
B. 27 m/s
5) What is the weight of a 20 kg object on earth?
a)196kg
b)196N
c)20N
d)20kg
b)196N
5) A box of mass 10 kg is pushed with a horizontal force of 50 N across a floor. If the
coefficient of kinetic friction is 0.2, what is the frictional force?
a) 10 N
b) 20 N
c) 50 N
d) 100 N
b) 20 N
5. Which action would require no work to be done on an object?
a) holding the object stationary above the ground
b) pushing the object along a horizontal floor against a frictional force
c) lifting the object from the floor to the ceiling
d) decreasing the speed of the object until it comes to rest
a) holding the object stationary above the ground