Physics Quiz

A 2000 kg truck and a 500 kg car are racing. The same amount of force is applied to each of them. Which statement below best describes the acceleration of the vehicles?

• The truck will accelerate twice as fast.

• The car will accelerate four times as fast.

• The car will accelerate twice as fast.

• The truck will accelerate four times as fast.

It takes a 7 N force to cause a 0.028 kg object to begin moving. What is the acceleration of the object as it begins to move?

• 250 m/s²

• 200 m/s²

• 150 m/s²

• 100 m/s²

A rocket booster initially applies 10,000 N of force to a 1,000.0 kg rocket causing it to accelerate at 10.0 m/s². Ten minutes later, the rocket booster is released and it falls through the atmosphere. The mass of the rocket is now 760.0 kg, and its acceleration is 7.0 m/s². How much force is now being applied to the rocket? Record your answer and fill in the bubbles on your answer document. Be sure to use the correct place value.

• 5320 N

• 7000 N

• 7600 N

• 5000 N

Using F=ma, explain why a train is more difficult to start moving and more difficult to bring to a stop than an average sized car.

• A train has more mass, requiring more force to change its motion.

• A train has less mass, requiring less force to change its motion.

• A train has the same mass as a car, so the force required is the same.

• A train's mass does not affect the force required to change its motion.

Based on the observations and the calculations made by the students, what is the estimated force applied to the skateboarder if the acceleration is 0.90 m/s²? Record your answer and fill in the bubbles on your answer document. Be sure to use the correct place value.

• 36

• 45

• 50

• 60

The masses of four bowling balls, and the net forces acting on them as they approach the pins at the end of the lane are recorded in the table below. Which bowling ball has the greatest acceleration as it approaches the pins at the end of the lane?

• The green ball

• The red ball

• The pink ball

• The purple ball

A roller coaster containing three cars is accelerating at 10 m/s² before it comes to an abrupt stop at the end of the ride. The mass of one car is 300 kg. How much force was exerted on the roller coaster to bring it to a stop?

• 30 N

• 900 N

• 3000 N

• 9000 N

During a tug-of-war competition, neither team is able to gain an advantage. Which of the following explains the forces in this situation?

• The forces are balanced.

• The forces are overcome by air friction.

• The mass of the rope cancels the forces being exerted on it.

• The forces are unbalanced.

A rocket is traveling from Earth to Mars at 10,000 m/s. If no outside force is applied to it, what will happen to its speed over the course of the trip?

• Speed up

• Slow down

• Stay constant

• Changes depending on mass

Observe the illustration above. If the student fell off of the skateboard in the direction indicated, which arrow indicates the most likely direction the skateboard would travel based on the law of action-reaction?

• 1

• 2

• 3

• 4