Calculating Acceleration
What is acceleration?
The rate at which velocity changes over time.
If forces go in the same direction do you add or subtract?
add
What type of forces are acting on a soccer ball at rest?
balanced
Which of Newton's laws explains why seatbelts are important in vehicles?
Newton's 1st Law
A car travels a distance of 150 meters in 3 hours. What is the speed of the car?
50 m/s
What formula is used to calculate acceleration?
acceleration = vf - vi / t
acceleration = change in velocity / time
If forces go in the opposite direction do you add or subtract?
subtract
Two kids pulling a rope in opposite directions but the kid in red applies a large force this results in:
an unbalanced force
When you jump off a small boat into the water, the boat moves backward. Which law of motion does this illustrate?
Newton's 3rd Law
A boat travels 200 meters downstream in 5 hours. What is the speed of the boat?
40 m/s
A bicycle accelerates from rest to 12 m/s in 6 seconds. What is the acceleration?
2 m/s2
What is the net force acting on a 5 kg object with a force of 25 N to the right and 10 N to the left?
15 N to the right
When a bicycle slows down, what type of forces are at play?
unbalanced
A heavy truck takes longer to accelerate than a small car when the same amount of force is applied. Which law explains this?
A train travels the first 120 meters of its journey at a speed of 60 m/s. It then completes the remaining 180 meters at a speed of 90 m/s. What is the train's average speed for the entire journey?
72 m/s
A skateboarder goes from 5 m/s to 15 m/s in 2 seconds. Calculate the acceleration.
5 m/s2
A 10 kg object has forces of 60 N to the left and 30 N to the right acting on it in opposite directions. What is the net force?
30 N to the left
two forces acting in opposite directions on an object, and do not cause a change in motion; equal in size
balanced forces
A skateboard stops suddenly, and the rider is thrown forward. Which law of motion is this an example of?
Newton's 1st Law
A car travels for 2 hours at a speed of 50 m/s and then for another 3 hours at a speed of 70 m/s. What is the car's average speed for the entire trip?
60 m/s
A car's speed increases from 0 m/s to 20 m/s in 5 seconds. What is its acceleration?
4 m/s2
If a cart with a mass of 15 kg experiences a net force of 45 N, what is the acceleration?
3 m/s2
If a box is pushed with a force of 20 N to the right and another force of 20 N to the left, are the forces balanced or unbalanced?
balanced
A rocket propels itself up by expelling gas downwards. Which law of motion is being applied here?
Newton's 3rd Law
A delivery truck travels 120 miles to the north and then 160 miles to the east. If the entire trip took 5 hours, what was the truck's average speed?
56 mph