2.
Distance a Bus Travels
Determine the acceleration of the bus.
There is no acceleration because the
bus moves at a constant speed and the
direction cannot be determined.
3.
What is the acceleration of a
4000kg plane that has a force on it
of 24,000N?
A=F/m
A = 24,000N / 4000kg
A = 6 m/s2
4.
Speed (km/h)
Interpret the data on the graph at each point.
1
2
3
Distance (km)
1. The object is decelerating slowly as the distance increases.
2. The object decelerates more quickly.
3. The object decelerates more slowly as moves farther away from
its starting point.
5.
If a force of 20N causes a ball to
accelerate at a rate of 1.5 m/s2, what
is the mass of the ball? Round to the
nearest hundredth.
M=F/a
M = 20N / 1.5m/s2
M = 13.33 kg
6.
A motorcycle is moving west on a road at
80km/hr. The driver notices a police officer
and lets off of the throttle. Describe what
happens to its speed and velocity.
The speed of the motorcycle
decreases. Therefore the velocity of
the motorcycle changes even
though the direction remains
constant.
7.
Describe the motion of the train.
The train is moving left with a
net force of 3N.
8.
Objects are affected by friction when they
move across other surfaces. Describe what
friction is and what this causes.
Friction is the force between surfaces
that resists the movement of one
surface past another surface. It will
cause an object to slow down or stop
moving.
9.
What is the speed of a sailboat that is
traveling 100 meters in 120 seconds?
Round to the nearest hundredth.
S=D/t
S = 100m / 120s
S = .83 m/s
10.
Describe the difference between
acceleration and velocity.
Velocity is a speed and direction at
any given time. Acceleration is a
change in velocity;
basically, acceleration describes if an
object has sped up, slowed
down, stopped moving, or changed
direction.
11.
Find the car’s average speed at 10 seconds.
2
4
6
Time (s)
8
S = D/t
S = 25m / 10s
S = 2.5m/s
10
12.
How much force must be applied to a
toy car that has a mass of 2.5kg to
achieve an acceleration of 2.4m/s2?
F=mxa
F = 2.5kg x 2.4m/s2
F = 6N
13.
Name at least one force the causes a
bicycle to stop moving.
The tires of the bicycle rolling across the ground
experience friction, a force that resists this movement.
It causes the bicycle to slow down.
The bicycle and rider may encounter air resistance, a
fluid friction force that resists movement by pushing
against an object. It causes the bicycle to slow down.
14.
At a speed of 7.5 m/s, how far can you
run in 40 seconds?
D=sxt
D = 7.5m/s x 40s
D = 300m
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