Forces
What are the units for force?
Newtons (N)
Distance is what type of quantity?
Scalar
A negative acceleration means the velocity did what?
Decreased
What is the momentum of a stationary object?
Zero
A firework breaking apart in the sky is an example of what type of collision?
Explosion
Fnet = ?
mass times acceleration
What are two things vectors MUST have?
Magnitude and Direction
What are the units of acceleration?
m/s2
The momentum of an object depends only 2 things. What are they?
Mass & Velocity
In collisions, the momentum before is always _____________ to the momentum after
Equal
A negative force means it is going ___________ to the direction of motion.
Momentum is what type of quanitity?
Vector
What is the acceleration of a cyclist if he sped up from 3m/s to 15m/s in 6s?
2m/s2
A soccer ball (0.2kg) was kicked with a velocity of 10m/s. What is it's momentum?
2kgm/s
Two bowling balls collide and after the collision, they move in opposite directions. What type of collision is this?
Hit & Rebound
Newton's 3rd Law States:
For every action, there is an equal and opposite reaction force
Karter walks 280m North to Dollorama. After getting some snacks, he walks back 160m south to the Bus Stop. What is his distance and displacement respectively?
Distance: 440m
Displacement:120m North
A skydiver starting at rest begins to freefall for 10s. Assuming normal acceleration due to gravity, what is his final velocity?
98.1m/s
Impulse is the measure of the _____________ in momentum
Change
A tertiary collision causes what kind of damage?
Organ damage
If a E-bike motor generates 500N of force and the rider & bike combined weigh 100kg, what is the magnitude of the acceleration?
5m/s2
What does the slope of a Velocity vs. time graph represent?
Acceleration
A car is moving at 25m/s and begins braking for 5s at a rate of 5m/s2. What distance did the car travel during it's braking?
A car (1000kg) accelerates from 2m/s to 10m/s. What is it's change in momentum?
8000kgm/s
A train car travelling at 5m/s collides with a stationary train car and afterwards, they move together. What would you expect to happen to the velocity after collision?
It will decrease because of the larger mass