Unit 1
1. A skydiver jumps from a helicopter hovering at high altitude. If we ignore the air resistance, how fast would she be falling 2.2 s after jumping?
A. 1.6 m/s
B. 9.8 m/s
C. 36 m/s
D. 21.56 m/s
D. 21.56 m/s
6. As a projectile falls, what happens to the components of velocity?
A. vertical velocity increases in magnitude, horizontal velocity stays the same
B. vertical velocity decreases in magnitude, horizontal velocity stays the same
C. vertical velocity stays the same, horizontal velocity decreases in magnitude
D. vertical velocity increases in magnitude, horizontal velocity increases in magnitude
A. vertical velocity increases in magnitude, horizontal velocity stays the same
6)A box of mass 10 kg is pushed to the right with a force of 40 N, while friction exerts a force of 10 N to the left. What is the box’s acceleration?
a) 0.5 m/s 2
b) 3.0 m/s 2
c) 4.0 m/s 2
d) 10.0 m/s 2
b) 3.0 m/s 2
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
1. As a ball falls freely (without friction) toward the ground, its total mechanical energy
a) Decreases b) Can't be determined
c) Remains the same d) Increases
c) Remains the same
Find the final velocity of an object that traveled a distance of 500 meter with an initial speed of 2m/sec and acceleration of the object was 0.5m/sec2.
A. 0.91 m/s
B. 1.8 m/s
C. 22.4m/sec
D. 6.7 m/s
C. 22.4m/sec
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
7) A cart of mass 12 kg is pulled to the right with 36 N while friction resists with 12 N to the left.
What is the cart’s acceleration?
a) 1.0 m/s 2
b) 2.0 m/s 2
c) 3.0 m/s 2
d) 4.0 m/s 2
b) 2.0 m/s 2
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
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
b) one-fourth as great
1. An athlete runs around a track that is 600 meters in 30 minutes . What is the athlete's average speed and velocity during this race?
A. Average speed was 20 m/s; average velocity was 0 m/s
B. 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
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
10) A swimmer pushes backward against the water with her hands. According to Newton’s 3rd Law, what happens as a result?
A. The swimmer moves forward because the water pushes back with equal force.
B. The swimmer slows down because no force acts on her.
C. The swimmer moves forward only if she pushes harder than the water.
D.The swimmer remains in place because the forces cancel out.
A. The swimmer moves forward because the water pushes back with equal force.
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
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
My teacher walks to East, 25m along the E Hall in 13s. They turn around and walk 5m to the left in 2.0s. 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
B. V=2.0 m/s; ��V = 1.33 m/s
C. V=1.92 m/s; ��V = 2.5 m/s
D. V=1.53 m/s; ��V = 1.8 m/s
B. V=2.0 m/s; ��V = 1.33 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
12) When a person jumps off a small boat, the boat moves backward. Which law explains this?
a) Newton’s 1st Law
b) Newton’s 2nd Law
c) Newton’s 3rd Law
d) Law of Conservation of Energy
c) Newton’s 3rd Law
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
A 2kg ball rolls off a 0.8m high table with an initial speed of 7 m/s. Ignore air resistance. As it first leaves the table, what is its kinetic energy?
49 J
16 J
11 J
7 J
49 J
"Speed is a vector because it describes how fast an object is traveling. Velocity is a scalar because it tells how fast and in what direction an object is traveling."
Which of the following statements is correct about the above one?
A. The understanding of speed and velocity is correct but understanding of scalar and vector is incorrect.
B. The understanding of speed and velocity is incorrect but understanding of scalar and vector is correct.
C. The understanding of all four terms (speed, velocity, scalar, and vector) is incorrect.
D. The understanding of all four terms (speed, velocity, scalar, and vector) is correct.
C. The understanding of all four terms (speed, velocity, scalar, and vector) is incorrect.
8. An object is launched horizontally across a room. How can a student determine the average horizontal velocity of the object using only a meter stick and a calculator?
A. The student can measure the range and use the acceleration due to gravity.
B. The student can measure the vertical drop and calculate the travel time of the object.
C. The student can measure the initial and final velocities and use the acceleration due to gravity.
D. The student can measure the vertical drop and range and calculate the flight time of the object.
D. The student can measure the vertical drop and range and calculate the flight time of the object.
11) During a baseball game, a bat strikes a ball with a force of 500 N. The ball exerts an equal
and opposite force on the bat. If the batter swings with a lighter bat instead of a heavier one, how
will the interaction change
a) The forces between the bat and ball will no longer be equal.
b) The ball will exert the same force back, but the lighter bat will experience greater acceleration.
c) The ball will exert less force because the bat is lighter.
d) The bat will not feel any reaction force since the ball is smaller.
b) The ball will exert the same force back, but the lighter bat will experience greater acceleration.
11) Design a simple investigation to demonstrate the force responsible for circular motion.
Which setup would best allow you to gather evidence of the centripetal force acting on an
object?
a) Dropping a ball from a height and measuring its fall time
b) Spinning a rubber stopper tied to a string and measuring the tension in the string
c) Rolling a ball on a flat surface and timing how long it moves
d) Measuring the weight of a ball on a scale
b) Spinning a rubber stopper tied to a string and measuring the tension in the string
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.
b) Its kinetic energy is at a minimum.
c) Its acceleration is at a maximum.
d) Its acceleration is zero.
b) Its kinetic energy is at a minimum.