Vectors
What are the two pieces of information that every vector must have?
Magnitude and Direction
Which type of vector do you draw with an arrow?
The force that opposes motion between two surfaces
Friction
What happens to Kinetic Energy when Velocity increases?
An object at rest stays at rest, and an object in motion stays in motion unless acted on by an unbalanced force.
Newton's First Law
Identify the magnitude and direction of each vector:
8 m/s West
4 N South
Magnitude: 8 m/s & 4 N
Direction: West & South
A force is applied to the same direction as motion will cause the object to do what?
The object will speed up
Which has more friction: Carpet or Ice
Carpet
What is a collision?
When two objects hit or interact with each other
For every action there is an equal and opposite reaction
Newton's Third Law
Draw these vectors:
4 N West
2 N East
2 N -->
4 N <----
What is acceleration?
When velocity changes
Why is a full shopping cart harder to push than a empty shopping cart?
The heavy shopping cart has more mass
What is the Law of Conservation of Energy?
Energy cannot be created or destroyed only transformed
What is Newton's Second Law?
Force = mass * acceleration
What is wrong with the way the vectors are drawn?
Draw the vectors correctly.
3 m/s ≡o
2 m/s o≡≡
The speed trails are not the right size.
3 m/s ≡≡o
2 m/s o≡
A car is moving North. To stop the car, which direction should the force be applied?
The force needs to go South
How does friction affect an object's velocity
It causes the velocity to decrease
What are common types of energy associated with a collision?
Kinetic energy, Thermal energy, and Sound energy
When bumper cars collide, both cars experience forces. Which of Newton's Laws best applies and why?
Newton's Third Law
Which vector is bigger?
5 N North
8 m/s South
You can't compare these two vectors because they are not the same size
List 3 ways a force can change an object's velocity and give and example of each.
Speed Up
Slow Down
Change Direction
Give an example of an scenario with high friction and high mass.
Answers may vary
Why can't a basketball bounce up to the height it was dropped from?
Energy will transfer from the ball to the ground and air around it
A car slams on the brakes and the passenger moves forward. Which Newton's Law explains this and why?
Assume the passenger is not wearing a seatbelt.
Newton's First Law