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Chapter 5 Circular motion, the planets and gravity

- A ball is traveling at a constant speed of 5 m/s in a circle with a radius of 0.8 m. What is the centripetal acceleration of the ball? What’s its direction?
- A car with a mass of 1200 kg is moving around a curve with a radius of 40 m at a constant speed of 20 m/s.

a) What is the centripetal acceleration of the car?

b) What is the magnitude of the force required to produce this centripetal acceleration? - Two 100-kg persons are separated by a distance of 1 m. using Newton’s law of gravitation, find the magnitude of the attractive gravitational force exerted by one person to the other.
- Two masses are attracted by a gravitational force of 0.36 N. What will the force of attraction be if the distance between the two masses is tripled?
- Does an astronaut have the same weight in different planets? Explain why.
- Why uniform circular motion has acceleration if it has the same speed everywhere?

Chapter 5 Circular motion, the planets and gravity
1. A ball is traveling at a constant speed of 5 m/s in a circle with a
radius of 0.8 m. What is the centripetal acceleration of the
ball? What’s its direction?
2. A car with a mass of 1200 kg is moving around a curve with a
radius of 40 m at a constant speed of 20 m/s.
a) What is the centripetal acceleration of the car?
b) What is the magnitude of the force required to produce this
centripetal acceleration?
3. Two 100-kg persons are separated by a distance of 1 m. using
Newton’s law of gravitation, find the magnitude of the
attractive gravitational force exerted by one person to the
other.
4.
Two masses are attracted by a gravitational force of 0.36 N.
What will the force of attraction be if the distance between the
two masses is tripled?
5.
Does an astronaut have the same weight in different planets?
Explain why.
...

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Attached.

Chapter 5 Circular motion, the planets and gravity

1. A ball is traveling at a constant speed of 5 m/s in a circle with a

radius of 0.8 m. What is the centripetal acceleration of the

ball? What’s its direction?

𝑣𝑣 2

𝑎𝑎 =

𝑟𝑟

52

𝑎𝑎 =

.8

25

𝑎𝑎 =

.8

𝒎𝒎

𝒔𝒔𝟐𝟐

𝑪𝑪𝑪𝑪𝑪𝑪𝑪𝑪𝑪𝑪𝑪𝑪𝑪𝑪𝑪𝑪𝑪𝑪𝑪𝑪𝑪𝑪 𝒂𝒂𝒂𝒂𝒂𝒂𝒂𝒂𝒂𝒂𝒂𝒂𝒂𝒂𝒂𝒂𝒂𝒂𝒂𝒂𝒂𝒂𝒂𝒂 𝒊𝒊𝒊𝒊 𝒕𝒕𝒕𝒕𝒕𝒕𝒕𝒕𝒕𝒕𝒕𝒕𝒕𝒕 𝒕𝒕𝒕𝒕𝒕𝒕 𝒄𝒄𝒄𝒄𝒄𝒄𝒄𝒄𝒄𝒄𝒄𝒄 𝒐𝒐𝒐𝒐 𝒕𝒕𝒕𝒕𝒕𝒕 𝒄𝒄𝒄𝒄𝒄𝒄𝒄𝒄𝒄𝒄𝒄𝒄

𝒂𝒂 = 𝟑𝟑𝟑𝟑. 𝟐𝟐𝟐𝟐

2. A car with a mass of 1200 kg is moving around a curve with a

radius of 40 m at a constant speed of 20 m/s.

a) What is the centripetal acceleration of the car?

b) What is the magnitude of the force required to prod...

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