F = ma
Rearrange this so acceleration is the subject:
A = f/m
Now input your values into this equation for the first question :
A = f/m
A = 15/45
A = 0.33333333 m/s
Then using this same equation change the force of 15 to 25 :
A = f/m
A = 25/45
A = 0.55555556 m/s
For the last question keep the force of 15N but change the mass to 70kg into the same equation :
A = f/m
A = 15/70
A = 0.21 m/s (rounded)
Answer:
Explanation:
We can solve the problem by using the following suvat equation:
where
v is the final velocity
u is the initial velocity
a is the acceleration
s is the displacement
For the car in this problem:
u = 0 (it starts from rest)
is the final velocity
s = 10 km = 10 000 m is the displacement
Solving for a, we find:
Momentum = (mass) x (speed)
Now that the truck, including its load of Stella, has stopped to refuel,
its speed relative to the pump is zero. So its momentum, relative to
the pump and everything else motionless with respect to the ground,
is
(14,000 kg) x (0) = zero .
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Answer:
A. The net force acting on the car from all directions is zero.
Explanation:
According to Newton's first law of motion, an object continues its uniform motion along a straight line, the net force acting on the object will be zero.
To experience a force, the object needs to change its speed or the direction of motion. Unless it experiences any change in the magnitude of speed or direction. The car doesn't experience any force.
If car is moving with a uniform speed in a circular motion. The net force acting on the car is not equal to zero. Since the car is changing its direction constantly, a force called centripetal force is acting on it.
Hence, if the car moves in a straight line, the net force acting on the car from all directions is zero.
