Unit 4: Motion
Unit 5: Forces
Unit 5: Newton Laws
Unit 6: Work and Power
Unit 6: Energy
100
Which of the following is an example of a vector quantity?
a. Car is 8 meters b. Car weighs 10 tons
c. Car drives 72 mph West d. Car drives 25 mph
c. Car drives 72 mph West
100
Student X pushes a 10-N box with a force of 2 N. At the same time, Student Y pushes the same box with a force of 6 N, but in the opposite direction. Which would most likely occur? (Ignore friction.)
a. The resultant force on the box would be 8 N
b. The resultant force on the box would be 18 N.
c. The box will move toward Student X
d. The box will move toward Student Y
c. The box will move toward Student X
100
Double Points: What is Newton's Third Law?
Newton's third law states that for every action, there is an equal and opposite reaction.
100
A force of 48 N is used to lift a box 0.5 m above a floor. What amount of work was done to lift the box? Include the units in your answer!
24 J
100
A ball is released from rest at position 1. The diagram shows the ball in four positions as it rolls along a track from left to right. In which position does the ball have its least gravitational potential energy?
D
200
A car slows from a velocity of 24m/s to 12m/s in 2 seconds. What is the acceleration of the car?
a. -6 m/s/s
b. -4 m/s/s
c. +4 m/s/s
d. +6 m/s/s
a. -6 m/s/s
200
+50 Points (250 Points Total): A force is described as
a. A push or a pull b. A pull only c. A push only d. None of the above
a. A push or a pull
200
Read the following statements. Which one is NOT a great illustration of Newton’s 3rd Law of Motion?
a. Firefighters hold hoses firmly because as the water shoots out, the hose is pulled back
b. A car speeding on the highway slows down when they see a police car
c. A cannon jumps back as it is fired by a soldier
d. When you sit in your chair, your body exerts a downward force on the chair and the chair exerts an upward force on your body
b. A car speeding on the highway slows down when they see a police car
200
If a runner exerts 450 J of work to make 50 W of power, how long did it take the runner to do the work? Include the units in your answer!
9s
200
As the velocity of a runner increases, which type of energy also increases?
Kinetic
300
A jogger runs exactly two full laps around a circular track that is 400 m long. What is the jogger's total displacement?
0m
300
A student applies a force to a box with a mass of 30 kg. If the student applies the same force to a box with a mass of 15 kg, which best describes the effect on the acceleration of the 15-kg box?
a. It is half the acceleration of the 30-kg box
b. It is double the acceleration of the 30-kg box
c. It is the same as the acceleration of the 30-kg box
d. It is triple the acceleration of the 30-kg box
b. It is double the acceleration of the 30-kg box
300
Which statement illustrates Newton’s first law?
a. A stone will not move unless something pushes or pulls it
b. A ball rolling across the floor eventually slows down
c. As a car comes to a stop, the passengers continue to move forward
d. All of the above
d. All of the above
300
A student moves a box across the floor by exerting 23.3 N of force and doing 47.2 J of work on the box. How far does the student move the box? Include the units in your answer!
2.025m
300
A roller coaster is at the top of a hill and begins to descend. Which statement best explains what happens to its energy as it moves down the hill?
a. Its potential energy increases and kinetic energy decreases, conserving total energy
b. Its kinetic energy is converted to thermal energy, increasing the total energy
c. Its potential energy is converted to kinetic energy, keeping the total energy the same.
d. Both the kinetic and potential energy increase, increasing the total energy
c. Its potential energy is converted to kinetic energy, keeping the total energy the same.
400
+100 Points (500 Points Total): What is the formula to calculate acceleration?
change in velocity/time
OR
Vf - Vi / time
400
Which sentence correctly describes a friction force?
a. It acts in the same direction as the motion of an object
b. It acts in a direction opposite to the motion of an object
c. It acts in a direction perpendicular to the motion of an object
d. It acts in the same direction as the force of gravity on an object.
b. It acts in a direction opposite to the motion of an object
400
If a 8 kg box is pushed by a force of 72 N, how fast does the box accelerate?
a. 175 m/s2
b. 9 m/s2
c. 343 m/s2
d. 0.14 m/s2
b. 9 m/s2
400
+200 Bonus Points (600 TOTAL POINTS): A soup manufacturing company has built a new motor-powered mechanical arm system to supply an average force of 300 N to push cases of soup cans a distance of 11 m in 15 sec. What is the power output required by the motor? Include the units in your answer!
220 W
400
A 20 kg rock falls from a height of 16.0 m above the ground. What is the potential energy of the rock?
3,136 J
500
A person walks 3km north, and then turns and walks 4km east. What is the displacement?
a. 5km b. 7km c. 1km d. 12km
a. 5km
500
Mr. V and Mr. F play tug-of-war with a rope. If Mr. V wins the game, what would likely be the combination of forces applied?
a. Both Mr. V and Mr. F applied a force of 50N each
b. Both Mr. V and Mr. F applied a force of 100N each
c. Mr. V applied a force of 50 N and Mr. F applied a force of 80N
d. Mr. V applied a force of 100 N and Mr. F applied a force of 40 N
d. Mr. V applied a force of 100 N and Mr. F applied a force of 40 N
500
What are the two things needed to calculate momentum?
Mass and Velocity
500
A crane operator in a junkyard used an electromagnet to lift an 17,640 pickup truck to a height of 13 m. How much work was done by the crane?
a. 1,356.92 J
b. 52,920 J
c. 176,400 J
d. 229,320 J
d. 229,320 J
500
An object has a mass of 10.5 kg and a velocity of 9.5 m/s. What is the kinetic energy of the object?
a. 7.06 J
b. 7.66 J
c. 473 J
d. 437 J
c. 473 J