Unit 2 Forces and Motion

a force that results in stability (no change in speed or direction)

• contact force

• reaction force

• balanced force

• unbalanced force

• action force

a force that is only exerted when objects touch

• action force

• reaction force

• contact force

• balanced force

• unbalanced force

initial push or pull of one object on another object

• balanced force

• reaction force

• unbalanced force

• contact force

• action force

a force that causes change in speed or direction

• contact force

• action force

• reaction force

• balanced force

• unbalanced force

push back or pull back by the second object

• unbalanced force

• action force

• reaction force

• balanced force

• contact force

What will be the effect on the boy in the picture if the driver stops quickly?

• He will remain in the same position.

• He will be pushed back into the car seat.

• He will move from one side of the car to the other.

• He will move forward pressing against the seatbelt.

Which two best explain why a rocket propels upward opposite the ground after launch, then pushes away from the ground because it had more force applied than gravity?

• Doppler Effect

• Newton's 1st Law of Motion (inertia)

• Newton's 2nd Law of Motion (acceleration/forces)

• Newton's 3rd Law of Motion (action-reaction)

Determine whether the following scenario is balanced or unbalanced.

Student sitting at a desk

• Balanced

• Unbalanced

Determine whether the following scenario is balanced or unbalanced.

Rocket taking off

• Balanced

• Unbalanced

Determine whether the following scenario is balanced or unbalanced.

Building collapsing

• Balanced

• Unbalanced