Show:
Motion and Speed
Acceleration
Forces
Newton's Laws
Calculations
100
What is speed?
A measure of how far something moves in a given amount of time.
100
What is the definition of acceleration?
A rate of change in velocity. (A change in speed and/or direction)
100
What is a force.
A force is a push or a pull.
100
What type of motion do Newton's Laws center around?
Force
100
A car drives 132 km in 3 hours. What is its average speed in kilometers per hour?
44km/hr
200
What is the term for a location to which you compare other locations?
Reference Point
200
What is velocity?
Speed in a specific direction
200
How do you calculate force and what units is it labeled with?
F = ma Force = mass x acceleration; Labeled in Newtons
200
What is Newton's First Law?
An object at rest stays at rest, and an object in motion stays in motion unless an unbalanced force acts upon that object.
200
Grace drives her car with a constant speed of 44 miles per hour. How far can she travel in 210 minutes?
She can travel 154 miles in 210 minutes.
300
Jenna ran 10 meters to the ice cream truck in 5 seconds. What equation would I use to solve for the speed that Jenna ran?
Speed equals the amount of distance divided by the time. S=d/t
300
What is the term for an object traveling in a circular motion, always changing direction.
Centripetal acceleration
300
What one word sums of the definition of Newton's 1st Law?
Inertia
300
A ball rolling down a hill for 9 seconds accelerates from 3 m/s to 34.5 m/s. What is the acceleration?
3.5 meters per second squared
400
What is a vector?
A quantity that has both size and direction. (Direction and magnitude)
400
How do you calculate acceleration?
(Vf-Vi) (V2-V1) a= ___________ or a = _____________ t t
400
List two types of forces and define them.
Gravity- force of attraction between two objects due to their mass; non-contact force Friction- contact force, two objects touch each other as they slide past each other Magnetic force- force that either pushes another object away or pulls it towards another object; acts at a distance
400
What is Newton's 2nd Law?
The acceleration of an object depends on the mass of an object and the amount of force applied. (F=ma)
400
You give a shopping cart a shove down the isle. The cart is full of groceries and has a mass of 18 kg. The cart accelerates at a rate of 3 m/s2. How much force did you exert on the cart?
F=ma F= (18kg) (3m/s2) F= 54 kgm/s2 F= 54 N
500
Michael and Noah are racing go carts. Michael's car goes 2 meters in 6 seconds. What is his speed? (Be sure to label with the proper units).
1/3 m/s or 0.33 m/s
500
Is it possible to have a negative acceleration? If yes, how would it happen?
Yes, negative acceleration is possible. If your ending speed is slower than your starting speed than you will have negative acceleration. in other words any time you slow down.
500
When forces of 1 N and 2 N act in the same direction on an object the net force is what?
3 N; When forces act in the same direction you add, when they are in opposite directions you subtract.
500
What is Newton's 3rd Law?
What is Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first. In other words: All forces act in pairs Ex) If you push against a wall, the wall pushes back
500
A worker drops his hammer off the roof of a house. The hammer has a mass of 9 kg, and gravity accelerates it at the usual 9.8 m/s2. How much force does the earth apply to the hammer?
F=ma F=mg g= 9.8m/s2 Answer= 88.2m/s2