Historical Development of Motion Ideas
Aristotle believed in natural and unnatural motion. What did he consider to be natural motion?
What is vertical motion
State the formula for velocity.
What is velocity equals, distance divided by time. Velocity requires direction.
What does the variable 'k' stand for in the stopping distance formula?
What is constant of proportionality. A value of the friction of the road and tires.
What is the formula for force?
What is f=m*a
Force = Mass x Acceleration
What are the formulas for impulse and momentum.
i=f*t
p=m*v
What did Aristotle think was the reason for an arrow to continue moving after it left a bow?
What is a vacuum behind the arrow, pushing it forward.
A snowboarder makes it down a 1000 m run in 60 s. What is her velocity?
What is 16.67m/s
Suzanna applies the brakes in her car, which is moving at a speed of 55km/h on a level, dry roadway, where k = 0.070. How much distance, in metres does she need to stop?
What is the units required for force. Include both the long form and the shortcut letter we use.
What is Newtons or kgxm/s2
A bullet weighs 0.004kg and is moving towards a target at 600m/s. What is its momentum?
What is 2.4 kg*m/s
Who conducted experiments with rolling balls on different slopes to come up with the idea of inertia?
Who is Galileo.
What is the full formula for acceleration?
Change in velocity / change in time.
Why is stopping distance always greater than breaking distance?
What is because stopping distance includes the distance travelled during reaction time, where breaking distance only includes the distance from when the brakes were pushed.
If mass is doubled and force remains the same, what happens to acceleration?
What is acceleration is halved.
A football player collides with another player. The force of the collision is 1000 kg●m/s2. The collision lasts 1 second. What is the impulse?
What is 1000N*s
Newton has 3 laws. What is the first law? Name and explanation?
What is the law of inertia. An object continues in its original condition of rest or motion unless acted on by an unbalanced force.
In a record-setting race, a race car reached a velocity of 145.08 m/s in 4.48 s. What was the race car’s acceleration? Assume the direction of the velocity is positive.
What is 32.4m/s2
What is the entire formula for stopping distance?
What is dstop=v*t+k(v2)
Desmond has an accelerometer app on his tablet that measures acceleration. To check it out, he sits on a skateboard and asks Rose to give him a push. Desmond, the skateboard, and the tablet have a combined mass of 65kg. The tablet records an acceleration of 2.0 m/s2. With what force did Rose push Desmond? Report your answer in Newtons.
What is 130N
During a race, a 1200 kg car slowed down to 100 km/h (28 m/s) just before it hit a brick wall. It stopped in 1 s. What force was involved?
What is -33,600kg*m/s2 or -33,600N
Explain Newton's third law. Name and explanation.
What is the law of action-reaction. For every action there is an equal, but opposite, reaction. For example when walking, you push on the ground, but it pushes back with equal force, propelling you forward as you have less mass than the ground.
A car enters a highway travelling 14 m/s. After 5.5 s, the car reaches a velocity of 28 m/s. What was the car’s acceleration?
What is 2.5m/s2
You drive at a speed of 27m/s on the highway and see a deer jump out 50 m in front of you. Will you be able to come to a complete stop in front of the deer under perfect driving conditions? (Assume you have an average reaction time.)
What is 54.54m
Remember the equation for force weight?
If you were one of the first people to commercially fly to the moon with Jeff Bezos, Blue Origin, what would your weight be if you were 80 kg? The moon’s gravity is 1.62 m/s2.
What is Fw=129.6N
When a vehicle stops, no matter how it stops, the impulse is the same. What is the difference maker in determining life and death in a car crash?
What is less force over a longer period of time instead of more force in less time.