Answer:
because the static friction is higher than the kinetic friction
Explanation:
Inertia is resistance to motion. Object resist changing its current motion or the rest position. This is the Newton's first law of motion
apart from this as the graph shows , the force needed to move when object at rest is higher than the force to change the motion of a moving body . this is because
<em>static friction > kinetic friction</em>
- static friction is the friction acts on a object resting on a rough surface
- kinetic friction is the friction acts on an object when it is moving on a rough surface
Answer:
The average acceleration of the rocket, a = 8.5 m/s²
Explanation:
Given that,
The upward force of the rocket, F = 1700 N
The time duration of rocket exerted the force, t = 8 s
The mass of the rocket, m = 200 Kg
The force exerted by the rocket is equal to the product of its mass and acceleration.
Therefore, the formula for force
<em> F = m x a</em>
a = F / m
Substituting the given values in the above equation
a = 1700 N / 200 Kg
= 8.5 m/s²
Hence, the acceleration of the rocket is, a = 8.5 m/s²
Answer:
67.4 m/s
Explanation:
The force acting on the car, and that causes the car to slow down, is the force of friction, which is given by:
where
is the coefficient of kinetic friction
m is the mass of the car
is the acceleration of gravity
According to Newton's second law:
where F is the net force on the car and a its acceleration. Comparing the two equations, we find an expression for the acceleration:
(1)
Since the motion of the car is a uniformly accelerated motion, we can use the following equation:
where
v = 0 is the final velocity of the car
u is the initial velocity
a is the acceleration
s = 290 m is the distance covered by the car while slowing down
Using (1) and solving for u, we find the initial velocity:
Compressions and rarefactions
