Unit 5 - Forces & Motion Test 2021

Which of the following is an example of balancing forces?

• A Book resting on the table.

• A pencil is knocked off the desk.

What is Newton's 1st Law?

• For every action there is an equal and opposite reaction.

• An object at rest will stay at rest, an object in motion will stay in motion, unless an unbalanced force acts upon it.

What is Newton's 2nd Law?

• For every action there is an equal and opposite reaction.

• Acceleration depends on two variables, the mass of the object and the amount of force.

What is Newton's 3rd Law?

• For every action there is an equal and opposite reaction.

• Acceleration depends on two variables, the mass of the object and the amount of force.

What explains why objects resist changes in their state of motion?

• gravity

• inertia

• force

• friction

What explains a quantity that has BOTH speed and direction?

• Inertia

• Force

• Speed

• Velocity

A soccer ball accelerates from rest with an acceleration of 0.8 m/s² for 5 seconds. What is the ball's final velocity?

• 0.16 m/s

• 6.25 m/s

• 4 m/s

• 0 m/s

During a race, a swimmer changes her velocity from 20 m/s to 40 m/s over a 15 second period. What is her acceleration?

• 4 m/s²

• 1.33 m/s²

• 13.33 m/s²

• 2.67 m/s²

While going sledding, you notice that you travel 470 meters in 98.2 s. What was your average speed?

• 0.48 m/s

• 461 m/s

• 4.79 m/s

• 2.09 m/s

A lacrosse ball is traveling at 10 m/s when it starts to accelerate at 15 m/s² for 5 seconds. What is the velocity once the ball stops accelerating?

• 55 m/s

• 65 m/s

• 75 m/s

• 85 m/s