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3 years ago

B. Explain why it is more difficult to move an object at rest, than to keep an object moving

Physics

1 answer:

vfiekz [6]3 years ago

4 0

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

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A hockey puck is hit on a frozen lake and starts moving with a speed of 13.60 m/s. Exactly 6.2 s later, its speed is 7.20 m/s. (

stellarik [79]

Answer:

-1.03 m/s²

Explanation:

Acceleration: This can be defined as the rate of change of velocity. The S. I unit of acceleration is m/s².

Mathematically, acceleration is expressed as

a = (v-u)/t ........................ Equation 1

Where a = acceleration, v = final velocity, u = initial velocity, t = time.

Given: u = 13.60 m/s, v = 7.20 m/s t = 6.2 s.

Substituting into equation 2

a = (7.20-13.60)/6.2

a = -6.4/6.2

a = -1.03 m/s²

Note: a is negative because, the hockey puck is decelerating.

Hence the average acceleration = -1.03 m/s²

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Nadusha1986 [10]

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