Dynamics Review

What is the gravitational acceleration on Earth?

• Depends on the object's mass

• 
  There is no acceleration from gravity on Earth

• 9.81 m/s^2

• 10 m/s

An object weighs 50 N on Earth. What is its approximate mass?

• 5 kg

• 500 kg

• 50 kg

• 10 kg

When you are free falling, what is the only force acting upon you?

• normal force

• force of gravity

• tension force

• magnetic force

Even if we ignore air resistance, heavier objects fall faster than lighter objects.

• True

• False

Archer is running with a velocity of 50 m/s. He then begins to accelerate at −2 m/s². Does that mean that he is speeding up, slowing down, or staying at the same speed?

• Slowing down

• Speeding up

• Staying at the same speed

Which is greater speed: A velocity of −15 m/s or a velocity of 4 m/s?

• Velocity of −15 m/s

• Velocity of 4 m/s

• They are the same speed

If you are traveling with a constant velocity, what is your acceleration?

• Zero

• Positive non-zero

• Negative non-zero

A car starts from rest. Five seconds later, it has a velocity of 30 m/s. If this car has a mass of 500 kg, what net force (in Newtons) did it experience during these five seconds?

• 15 N

• 3000 N

• 35 N

• 5000 N

A box is traveling at a constant speed of 4 m/s. What is the net force acting upon this box?

• Not enough information is provided to answer

• -20 N

• 4000 N

• 0 N

 What is the force of friction between a block of ice that weighs 950 N and the ground if μ = .12? 

• 65 N

• 226 N

• 175 N

• 114 N