Physics Fast Facts

Why is this funny?

• Because gravity.

• It's not the impact velocity, it's the stopping acceleration that causes destruction

• because most people don't understand it

• the greater your mass is the harder you hit

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Is this object in equilibrium?

• Yes and it's moving right

• Yes and its at rest

• No, it's accelerating right

• No, it's at rest

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Here are 3 FBD diagrams for an elevator. Consider them to be A, B, C. Which one shows an elevator at rest?

• A

• B

• C

• none of these

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The center of mass of a system of objects obeys Newton's Second Law.

• True

• False

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__________ exists when an object rotates.

• Translational kinetic energy

• Rotational kinetic energy

• Kinetic energy

• Gravitational potential energy

• Elastic potential energy

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The Earth pulls downward on a pingpong ball with a force  of 1N. If this is the "action" force, what is the "reaction" force?

• The ground exerts a force of 1N on the ping pong ball

• The ping pong ball exerts a force of 1 N on the Earth

• The ping pong ball pushes down on the earth with a force of 1N

• The is no reaction force when a gravitational force is involved

Given the FBD, which of the following must be true?

• The frictional force must be accelerating the system to the left.

• The box must be accelerating to the right.

• The box must be moving to the right.

• The FBD is incorrectly drawn. This situation isn't possible

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A car travels up a hill at constant speed. Which of the following diagrams best represents the forces acting on the car at this instant?

• 
• 
• 
• 

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If we apply a ___________ to an object, its __________________ will change and it will  ______________.

• force, accelerate, gravity

• accelerate, inertia, gravity

• force, velocity, accelerate

• velocity, gravity, inertia

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NGSS.HS-PS2-1

A ball is suspended by a lightweight string, as shown in the figure.   The ball is displaced to position 1 and released. The four labelled positions are evenly spaced along the arc of the ball's motion.  
Between which adjacent pairs is the gain in kinetic energy the greatest?

• 1 and 2

• 2 and 3

• 3 and 4

• They are all equal