Force Reduction
In order to prevent injuries, what will need to happen to force?
Force needs to be decreased/reduced
What does p, m, and v stand for in the momentum equation?
P = momentum
M = mass
V = velocity
Consider a system where a stationary crash test dummy is hit by a car, moving at 10 km/hr. The crash test dummy has a mass of 70 kg. The car has a mass of 1,300 kg. What will be the momentum of the combined car-dummy system after the collision?
13,000 kg*km/hr
Using the equation F = m*a, what would we need to do to mass in order to reduce force?
Reduce/decrease mass
What would be a limitation/constraint if adding more safety equipment to a car?
Money, weight, maintenance and repairs
What needs to happen to the time of impact in order to reduce force?
Time of impact should be increased
Complete the sentence: Momentum is always _____________ in a system.
Conserved
Consider a system where a stationary crash test dummy is hit by a car, moving at 17 km/hr. The crash test dummy has a mass of 10 kg. The car has a mass of 1,900 kg. What will be the momentum of the combined car-dummy system after the collision?
32,300 kg*km/hr
Using the equation F = m*a, what would we need to do to acceleration in order to reduce force?
Reduce/decrease acceleration
A new airbag system is introduced to a car company, they decide to make airbags softer. What science idea does this support?
Less rigidity spreads out force over time to reduce injuries.
What type of material should be used in seatbelts and airbags in order to reduce force?
Less rigid materials
Complete the sentence: If a moving car hits a stationary object, total momentum after = _____________.
The car’s original/initial momentum
Consider a system where a stationary crash test dummy is hit by a car, moving at 30 km/hr. The crash test dummy has a mass of 20 kg. The car has a mass of 800 kg. What will be the momentum of the combined car-dummy system after the collision?
24,000 kg*km/hr
Using the equation F = (m * v)/ t , what would we need to do to change in time in order to reduce force?
Increase change in time
A new Waymo is invented that has a longer stopping time. What science idea does this support?
A longer stopping time will decrease force
What needs to happen to change in velocity in order to reduce force?
Change in velocity should be decreased/reduced
Using the equation t = (m * v)/F , if momentum were to decrease, what would happen to the change in time?
The change in time would decrease
Consider a system where a stationary crash test dummy is hit by a car, moving at 32 km/hr. The crash test dummy has a mass of 35 kg. The car has a mass of 2,000 kg. What will be the momentum of the combined car-dummy system after the collision?
64,000 kg*km/hr
Using the equation F = (m * v)/ t , what would we need to do to mass in time in order to reduce force?
Reduce/decrease mass
Speed limits are lowered for a county. What science idea does this support?
Lower speed can reduce force
What needs to happen to mass in order to reduce force?
Mass should be decreased/reduced
If a dummy-vehicle system has a momentum of 19,000 kg*km/hr, what will the momentum be after the collision? Why?
19,000 kg*km/hr because momentum is conserved
Consider a system where a stationary crash test dummy is hit by a car, moving at 50 km/hr. The crash test dummy has a mass of 45 kg. The car has a mass of 3,000 kg. What will be the momentum of the combined car-dummy system after the collision?
150,000 kg*km/hr
Using the equation t = (m * v)/F , what would we need to do to change in time in order to reduce force?
Increase change in time
A car is created to decelerate value over a longer period of time which will lower the deceleration value since a=v/t. What science idea does this support?
Decreasing acceleration will reduce force