Motion
How do we know if something is in motion?
We know something is in motion if it changes position relative to a reference point.
Define a force.
A force is a push or a pull on an object
What do Newton's three laws of motion describe.
Newton's three laws of motion describe how forces interact with objects to cause motion.
Finish the sentence:
All motion is caused by a force, but __________________________.
All motion is cause by a force, but NOT ALL FORCES CAUSE MOTION.
What are the characteristics of a force?
All forces have strength, magnitude, and direction. All forces are measured in Newtons (N).
What causes an object to stop moving?
How can we measure the motion produced by a force?
We can measure the motion produced by a force by calculating the distance, time, speed, velocity, and acceleration.
Name the six main types of contact forces
Applied force, friction, spring force, tension, normal force, and buoyancy.
What is Newton's First Law of Motion?
An object at rest will remain at rest unless acted upon by unbalanced forces.
How is velocity different from speed and acceleration?
Velocity is speed but with direction (speed is the amount of distance an object moves over a period of time). When velocity increases or decreases, acceleration takes place.
What are the three main types of non-contact forces?
What is Newton's Second Law of Motion?
An object accelerates when a force acts on an object with mass.
A ball is rolled from a resting point at the top of a hill. It moves down the hill until it reaches the bottom and stops. The total distance travelled is 30 meter. If the time it took for the ball to start and stop moving is 15 seconds, what is the net velocity of the ball?
2 m/s
An apple falls from the branch of a tree. The gravitational force acting on the apple is pulling 4N downwards. At the same time, air resistance is pushing the apple 8N upwards. Draw a free body diagram of the forces acting on the apple. What is the net force and direction?
Net force: 4 N
Direction: down
What is Newton's Third Law?
For every action, there is an equal and opposite reaction.