Forces in Action
What force pulls objects toward Earth?
Gravity
A car moves at a constant speed. Are the forces balanced or unbalanced?
Balanced
Newton’s 3rd law states that for every action there is an equal and opposite what?
Reaction
Energy of motion is called what?
Kinetic Energy
In a roller coaster, potential energy turns into what as the car speeds up?
Kinetic Energy
What force slows objects that slide across a surface?
Friction
Two people push a box in opposite directions: 10 N left, 10 N right. Calculate the magnitude of the Net force?
0 (N) Balanced
A rocket pushes gas downward. What is the reaction force?
The rocket moves upward
What type of wave moves matter up and down?
Transverse Wave
In an electrical circuit, electrical energy can transform into what two forms?
Light and Thermal Energy
A person pushes a box with 20 N of force. This is an example of what type of force?
Applied
A 5 N upward force and a 15 N downward force act on an object. Which direction will the object move?
Downward
When you jump off a boat, the boat moves backward. Why?
Action-reaction Force pair
Sound travels as what kind of wave?
Longitudinal wave
In a food web, how is energy transferred?
From one organism to another when eaten
What force pushes upward on a book sitting on a table?
Normal
A student pulls a wagon left with 30 N of force while friction pushes back with 10 N to the right. What is the direction and net force?
20 N left (unbalanced)
A hammer hits a nail with 50 N. How much force does the nail apply back?
50N
Food stores what type of potential energy?
Chemical Potential energy
Photosynthesis transforms light energy into what?
Chemical
Name the force that attracts or repels certain metals.
Magnetism
A ball is at rest. What must be true about the forces acting on it?
They are balanced
Identify the force pair when a basketball hits the ground.
Ball pushes ground; ground pushes ball equally and oppositely
The distance between two wave crests is called what?
Wavelength
Describe how energy is conserved in a system.
Energy changes form but is never created or destroyed