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SPH4C Kinematics
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Determine the forces acting on a person in free fall
gravity
Determine the forces acting on a basketball falling down
gravity, air resistance.
Determine the forces acting on the object: a textbook pushed across a desk
Normal, gravity, applied force, kinetic friction
Calculate the force required to throw a 0.5 kg basketball upwards.
F=mg = 0.5 x 9.8 N = 5 N [UP]
Calculate the force of gravity acting on a basketball that is 0.5 kg.
F=mg = 0.5 x 9.8 = 4.9 N = 5 N [down[
What is Newton's First law
Inertia- object in motion stays in motion, object at rest stays at rest. (Unless it experiences an external force)
A hockey player pushes the wall with a force of 12 N [W], what is the reaction force?
12 N [E] wall pushing him opposite direction
Explain why a truck requires more time and more force to brake than a car?
Can talk about Newton's first or second law
What changes depending on gravity: weight or mass
weight
Convert 200 N to kg.
20.4 kg
Convert 15 kg to weight.
147 N
What does a flat line on a speed-time graph represent in terms of acceleration.
No acceleration, object experiencing constant speed.
What does a flat line on a distance-time graph represent
Object at rest
The ---------------------- (steeper/flatter) the slope of a distance time graph, the faster the object.
Steeper (flatter means slower)
The slope of a displacement time graph gives what value?
Velocity
The slope of a distance time graph gives what value?
Speed
A negative acceleration represents...
Slowing down or deceleration
Liam ran 20 km east, 20 km west, and then 5 km south all in 1 hour. What is his velocity?
5 km/h [S]
Liam ran 20 km east, 20 km west, and then 5 km south all in 1 hour. What is his speed?
45 km/h
What is the net force of something with constant velocity
0 N - something at rest or something with constant velocity (no acceleration)
What is the net force is a box is being pushed with a force of 12 N [E] and force of friction is 10 N
2 N [E]
What is the difference between speed and velocity?
Velocity is vector, speed scalar
What is the difference between distance, position, and displacement?
Distance - total amount travelled, position - distance from a reference point (w/ direction), displacement - change in position
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