Newton's 2nd Law
What does the "a" represent in F = ma?
What is acceleration.
What is the net force when forces are balanced?
What is zero
What happens to particle motion when temperature increases?
What is Particles move faster.
Which variable increases stopping distance: greater speed or lower speed?
What is Greater speed.
What safety devices increase stopping time during a collision?
What is Seatbelts and airbags.
If force increases while mass stays the same, what happens to acceleration?
What is Acceleration increases.
A book sitting on a desk is an example of what type of forces?
What is Balanced forces.
As temperature increases, density tends to ________.
Whta is Decrease
Which variable increases stopping distance: longer reaction time or shorter reaction time?
What is Longer reaction time.
If stopping time increases during a collision, what happens to force?
What is Force decreases.
If mass increases while force stays the same, what happens to acceleration?
What is Acceleration decreases
An earthquake occurs when stress causes rocks to suddenly move. What type of forces caused this?
What is Unbalanced forces.
Less dense mantle material tends to do what?
What is Rise
Using the model:
Stopping Time = (Mass × Speed) ÷ Braking Force
Which variable in the denominator decreases stopping time when increased?
Braking force
In two crashes, a dummy goes from 20 m/s to 0 m/s.
What is the same in both crashes?
What is Change in velocity.
What type of forces cause a change in motion?
What is Unbalanced forces.
Why do balanced forces not cause motion?
They cancel each other out.
What process moves matter through Earth's mantle?
What is Convection currents
Vehicle A = 1000 kg
Vehicle B = 2000 kg
Same speed and braking force.
Which takes longer to stop?
Vehicle B
Why do airbags reduce injury risk?
What is They increase stopping time and reduce force.
A car experiences twice the braking force while keeping the same mass. What happens to stopping time?
What is Stopping time decreases
Explain the difference between balanced and unbalanced forces.
Balanced forces have a net force of zero and cause no change. Unbalanced forces create a nonzero net force and cause motion or deformation.
Complete the chain:
Radioactive Decay → ______ → Mantle Motion → Plate Motion → Surface Features
What is Internal Heating.
Name TWO variables that increase stopping time.
What is Mass and speed.
A crash test dummy goes from 20 m/s to 0 m/s.
Scenario A: Stops in 0.2 seconds.
Scenario B: Stops in 1.0 second.
Which scenario is safer and why?
Scenario B. The velocity change is the same, but the stopping time is longer, so the force is smaller and the risk of injury is reduced.