Forces and Motion Test

A student created a poster describing how Newton’s Laws work simultaneously to propel a rocket into space. Select the TWO correct descriptions from the student poster below.

• Newton's First Law - The rocket will not move until an unbalanced force acts on it.

• Newton's Second Law - The size of the rocket does not affect the amount of fuel needed.

• Newton's Third Law - The force of the burning fuel pushes the rocket in the opposite direction.

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?

(a)  

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. Be sure to use the correct place value.

(a)  

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

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

A force that will work against motion in every situation is —

• The normal force

• weight

• gravity

• friction

You are riding in a vehicle with a coffee cup on the dashboard while traveling 30 km/h. The vehicle makes a sudden stop to avoid hitting the car that has stopped in front of it.

Which illustration best demonstrates what would happen to the coffee cup?

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• 
• 
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Describe the action and reaction forces of an ice skater performing a jump.