Physics Semster

Object 1 and object 2 travel across a horizontal surface, and their horizontal velocity as a function of time is shown in the graph. Which of the following statements is correct about the two-object system?

• A. The magnitude of acceleration for object 2 is greater than the magnitude of the acceleration of object 1.

• B. After 2s, object 1 travels a greater distance than object 2 travels.

• 3. C. Object 1 and object 2 are at the same horizontal position at 2s.

• D. After 4s, the speed of object 1 is greater than the speed of object 2.

Two blocks are connected by a rope, as shown above. The masses of the blocks are 5 kg for the upper block and 10 kg for the lower block. An upward applied force of magnitude F acts on the upper block.

The system is moving and accelerating upward. A pair of scissors cuts the rope. Which of the following describes the motion of the 10 kg block immediately after the rope has been cut?

• A. The block continues to move upward and to accelerate upward.

• B. The block begins to move downward but continues to accelerate upward.

• C. The block continues to move upward but begins to accelerate downward.

• D. The block begins to move downward and to accelerate downward.

A student uses both hands to push a door such that it moves and swings open after the force has been applied. The student then makes the following claim: “I can use both of my hands to apply a constant force on my body so that my body falls backward.” Which of the following statements correctly justifies the student's claim?

• The claim is correct because the situation is the same as if another person’s hands applied a force on the student.

• The claim is correct because the student’s hands will exert a net force on the student’s body.

• The claim is not correct because the student’s hands cannot exert a force on the student’s body.

• The claim is not correct because the student’s body will exert a force of equal magnitude back on the student’s hands as a result of Newton’s third law of motion.

What is the formula for centripetal force?

• Fc = mvr^2

• Fc = m/r^2v

• Fc = mv^2/r

• Fc = mr^2/v

How does centripetal force keep an object in circular motion?

• Centripetal force has no effect on the object's motion.

• Centripetal force decreases the object's mass.

• Centripetal force changes the direction of the object's velocity.

• Centripetal force increases the object's speed.

What is the formula for gravitational force?

• F = G * (m1 * m2) / r^2

• F = G * (m1 - m2) / r^2

• F = G * (m1 * m2) * r^2

• F = G * (m1 + m2) / r^2

Scott travels north 5 miles and then goes west 3 miles before coming straight back south 2 miles. What is his distance?

• 10
• 7
• 8
• 6

 Jermaine runs exactly 2 laps around a 400 meter track. What is the displacement?

• 800
• 400
• 0
• 200

What was Albert doing between 0 and 12 seconds?

• Traveling at a constant speed.
• Accelerating
• Stopped 
• Traveling back to start

What is the average speed of the person during the first 5 seconds?

• 0 m/s
• 1 m/s 
• 3 m/s
• 6 m/s