041: Cat. 2: Physics Part 1

Two students are working together to build a birdhouse. Student 1 applies a force of 10 N to a wooden board in order to slide it across the table to Student 2. 
If the force of friction resisting the student’s push is 4 N, what is the net force acting on the board? 

• 4 N
• 6 N
• 10 N
• 14 N

The graph below shows the motion of a ball rolling on a straight track. 
What was the ball’s average speed during the time represented in the graph?

• 0.2 m/s
• 0.5 m/s
• 5.0 m/s
• 10.0 m/s 

The list includes six situations. 
Which objects in the list experience an unbalanced force?

• Book, ball, & car
• Ball, car, & bird
• Can, swing, & bird
• Book, ball, can, & swing

Deep Space 1 was a spacecraft powered by an engine that gave off xenon particles to change velocity. It had a mass of 500 kg.
Which expression can be used to find the spacecraft’s acceleration if its engine created a net force of 0.10 N? 

• 0.10 N over 500 kg
• 500 kg x 0.10 N
• 500 kg over 0.10 N
• 500 kg + 0.10 N 

The drawing shows two identical airplanes at an air show. The airplanes are flying at the same speed. Airplane W is flying 50 m higher than Airplane X. 
Which statement best describes the energy of the two airplanes?

• Airplane W has a greater kinetic energy than Airplane X.
• Both airplanes have the same gravitational potential energy but different kinetic energies.
• Airplane X has more gravitational potential energy than Airplane W.
• Both airplanes have the same kinetic energy but different gravitational potential energies

A hobbyist collected data about the motion of a toy train on a straight track and then recorded the data in the graph below. 
Which of these accurately describes the motion of the toy train?

• Toy train speeds up while going forward and then slows down.
• Toy train slows down while going forward and then moves backward.
• Toy train moves forward at a constant speed, slows down, and then stops.
• Toy train moves forward at an increasing speed, stops, and then moves forward. 

NASA’s space shuttle program was active from 1981 until 2011. The photograph shows rockets carrying a space shuttle off the launchpad. 
How can Newton’s law of action–reaction best be applied to explain the movement of a rocket?

• As the fuel burns, gases push against the rocket, moving it upward.
• As the fuel burns, gases move out of the rocket and reduce air resistance.
• As the fuel burns, the mass of the rocket decreases.
• As the fuel burns, the rocket moves faster.

A golfer hits a golf ball with a club. The mass of the ball is 0.05 kg. The ball accelerates at 2,000 m/s².
What is the net force, to the nearest newton, that accelerates the ball?

• 10,000 N
• 1 N
• 100 N
• 400 N

A student graphed the position of a cart during a 7-second time interval. 
Which statement best describes the cart?

• Cart was stationary w/ a velocity of 0 m/s for the entire 7 seconds.
• Cart was stationary except for a short burst of acceleration of 0.5 m/s².
• Cart moved @ a constant velocity of 0.5 m/s for the entire 7 seconds.
•  Cart accelerated @  constant rate of approximately 0.8 m/s²

A teacher rubbed a match against a piece of sandpaper. The match started to burn.
Which statement best describes the energy changes that occurred?

• Chemical energy stored in the match changed to thermal energy & light energy.
• Thermal energy stored in the match changed to light energy & chemical energy.
• Light energy & thermal energy stored in the match changed to mechanical energy.
• Light energy& thermal energy stored in the match changed to chemical energy.