Physics Week 12 CCA Classroom Review
1)A physics student stands on a scale which reads 75 kg. The student knows that kg is just a measure of mass. What is the weight of the student?
2)Compared to earth, planet Vegeta has 6 times the mass and double the radius. How much larger is the acceleration of gravity?
3)What are 2 ways to decrease the force of gravity?
4)What direction does the centripetal force point in the diagram below?
5)For this free body diagram: What is the Net Force? The Mass? And the acceleration?
6)What did Isaac Newton say about people standing on a mountain vs people standing in a valley?
7)Einstein said that Gravity can bend ______which means that ______could exist.
8)If the sun doubled its mass and doubled its distance from the earth, what would happen between the force of gravity between the earth and the sun?
9)A running back charges towards you and can apply a force of 4000 N if they tackle you. A second running back charges at you as well. If he can apply the same force as the first one, what will happen to your acceleration if both tackle you at the same time? (instead of just one)
10)If you have a force pushing 3 N to the right, and another force pushing 20 N to the left, what is the Net Force?
11)A bag of feathers (mass = 2 kg) and a bag of bricks (mass = 50 kg) are shot horizontally from a catapult with the same angle and initial velocity. Which bag travels the farthest? Draw the path taken by bags:
12) What is the weight of each bag? What is the magnitude and direction of the acceleration of each bag?
13)Which bag has more inertia?
14)Complete the Table:
Fg / m1 / m2 / dx2 / x1 / x1
x1 / x1 / x2
x1 / x1 / x4
x2 / x2 / x1
x5 / x1 / x3
x1/8 / x1 / x4
x24 / x3 / x2
15)2 hockey players hit a hockey puck with the following force. What direction will the hockey puck go?
16)What direction is the centripetal force pulling on the toddler?
17)Which law of motion implies that forces always come in pairs?
18)What is the acceleration for the object below?
19)A meteor is travelling towards earth! What happens to the pull of earth’s gravity on the meteor as it halves the distance between itself and the earth? What happens when it halves that distance as well? What about when it halves that distance?
20)A missile is launched at the meteor and breaks it into 4 equal parts, the force of gravity on each part is ______than it was for the original meteor.
21)A tennis ball, A pit bull/lab mix, RC car, and A size 9 shoe
Who has the most inertia?
22)For each concept, say if it is from Einstein, Newton, or if it isn’t true.
Gravity is an attractive force / Newton / Gravity is constant everywhereThere is no gravity in space / Not true / Black Holes can exist
Gravity is a curve in space time / / Gravity depends on mass
Gravity can bend light / / The higher you climb, the less you weigh.
Gravity weakens with distance / All orbits are circular
23)Calculate the force need to accelerate a .5 kg baseball at 75 m/s^2.
24)What is the direction of the acceleration for a lacrosse ball at the top of its arc?
25)A 30 kg stack of books are dropped from a height of 60 m. What is the force of gravity on the books?
How much do the books weigh?
26)A commando lugs around a 45 kg backpack through the jungle. He’s hunted by another commando with a backpack of the same mass. The first commando activates a jetpack which expends 10 kg of fuel and launches him in the air, leaving the other commando behind. Which backpack had more inertia at the start?
27)How does horizontal motion impact vertical motion?
TIME / Velocity1 / 10 m/s
2 / 30 m/s
3 / 50 m/s
28)Given the data above, draw the free body diagram for a helicopter going at these speeds.
29)Complete the tables below:
F / m / a / F / m / a2 kg / 7 m/s2 / x2 / x1 / _x2_
20 N / 10 m/s2 / x4 / x1
30 N / 6 kg / / x2 / x1
30)If the sun gained a mass 5 times larger than it is now, but the earth moved 3 times farther away, how would the force of gravity change?
31)What is the weight, of a potato-basketball-gun with a mass of 500kg?
32)What is the mass and acceleration of the following object?
33)
Starting Force / Magnitude and direction / Applied by the ______/ On the ______/ Describe the partner forceA soccer player kicks a soccerball forward with a force of 75N. / 75 N backward / Soccer ball / Soccer player / The soccerball applies a backward force of 75N on the soccer player.
A student pushes down on a desk with a force of 50 N. / The desk pushes up on the student with a force of 50 N.
The earth pulls on the moon with a force of 2.22 x 1020 N. / ______
Towards the moon / The moon pulls on the earth with a force of 2.22X10^20 N.
34)In a roller coaster, what kind of force keeps you from falling out of the roller coaster?
35)What is the magnitude and direction of the net force ?
36)An elephant is moving according to the free body diagram below:
What is the mass of the elephant?
4)What is the acceleration of the elephant?
5)If the distance between 2 planets doubles, what happens to the force of gravity between them?
6)An ant is sitting on a spinning top. What force keeps the ant from falling off the top? What direction does it point?
7)Frank Ocean, Miley Cyrus, LeBron James
Who has the most inertia?
Who has the least?
8)A soccer player kicks a soccerball with a force of 20N. Another player comes and kicks the ball with twice the force. How does the acceleration change?
Answers
1)A physics student stands on a scale which reads 75 kg. The student knows that kg is just a measure of mass. What is the weight of the student?
2)Compared to earth, planet Vegeta has 6 times the mass and double the radius. How much larger is the acceleration of gravity?
3)What are 2 ways to decrease the force of gravity?
4)What direction does the centripetal force point in the diagram below?
5)For this free body diagram: What is the Net Force? The Mass? And the acceleration?
6)What did Isaac Newton say about people standing on a mountain vs people standing in a valley?
7)Einstein said that Gravity can bend ______which means that ______could exist.
8)If the sun doubled its mass and doubled its distance from the earth, what would happen between the force of gravity between the earth and the sun?
9)A running back charges towards you and can apply a force of 4000 N if they tackle you. A second running back charges at you as well. If he can apply the same force as the first one, what will happen to your acceleration if both tackle you at the same time? (instead of just one)
10)If you have a force pushing 3 N to the right, and another force pushing 20 N to the left, what is the Net Force?
11)A bag of feathers (mass = 2 kg) and a bag of bricks (mass = 50 kg) are shot horizontally from a catapult with the same angle and initial velocity. Which bag travels the farthest? Draw the path taken by bags:
12) What is the weight of each bag? What is the magnitude and direction of the acceleration of each bag?
13)Which bag has more inertia?
14)Complete the Table:
Fg / m1 / m2 / d/ x2 / x1 / x1
x1 / x1 / x2
x1 / x1 / x4
/ x2 / x2 / x1
/ x5 / x1 / x3
x1/8 / x1 / / x4
x24 / x3 / x2 /
15)2 hockey players hit a hockey puck with the following force. What direction will the hockey puck go?
16)What direction is the centripetal force pulling on the toddler?
17)Which law of motion implies that forces always come in pairs?
18)A meteor is travelling towards earth! What happens to the pull of earth’s gravity on the meteor as it halves the distance between itself and the earth? What happens when it halves that distance as well? What about when it halves that distance?
19)A missile is launched at the meteor and breaks it into 4 equal parts, the force of gravity on each part is ______than it was for the original meteor.
20)A tennis ball, A pit bull/lab mix, RC car, and A size 9 shoe
Who has the most inertia?
21)For each concept, say if it is from Einstein, Newton, or if it isn’t true.
Gravity is an attractive force / Newton / Gravity is constant everywhere /There is no gravity in space / Not true / Black Holes can exist
Gravity is a curve in space time / / Gravity depends on mass /
Gravity can bend light / / The higher you climb, the less you weigh. /
Gravity weakens with distance / / All orbits are circular /
22)Calculate the force need to accelerate a .5 kg baseball at 75 m/s^2.
23)What is the direction of the acceleration for a lacrosse ball at the top of its arc?
24)A 30 kg stack of books are dropped from a height of 60 m. What is the force of gravity on the books?
How much do the books weigh?
25)A commando lugs around a 45 kg backpack through the jungle. He’s hunted by another commando with a backpack of the same mass. The first commando activates a jetpack which expends 10 kg of fuel and launches him in the air, leaving the other commando behind. Which backpack had more inertia at the start?
26)How does horizontal motion impact vertical motion?
TIME / Velocity1 / 10 m/s
2 / 30 m/s
3 / 50 m/s
27)Given the data above, draw the free body diagram for a helicopter going at these speeds.
28)Complete the tables below:
F / m / a / F / m / a2 kg / 7 m/s2 / x2 / x1 / _x2_
20 N / 10 m/s2 / x4 / x1 /
30 N / 6 kg / / / / x2 / x1
29)If the sun gained a mass 5 times larger than it is now, but the earth moved 3 times farther away, how would the force of gravity change?
30)What is the weight, of a potato-basketball-gun with a mass of 500kg?
31)What is the mass and acceleration of the following object?
32)
Starting Force / Magnitude and direction / Applied by the ______/ On the ______/ Describe the partner forceA soccer player kicks a soccerball forward with a force of 75N. / 75 N backward / Soccer ball / Soccer player / The soccerball applies a backward force of 75N on the soccer player.
A student pushes down on a desk with a force of 50 N. / / / / The desk pushes up on the student with a force of 50 N.
The earth pulls on the moon with a force of 2.22 x 1020 N. / ______
Towards the moon / / / The moon pulls on the earth with a force of 2.22X10^20 N.
33)In a roller coaster, what kind of force keeps you from falling out of the roller coaster?
34)What is the magnitude and direction of the net force ?
35)An elephant is moving according to the free body diagram below:
What is the mass of the elephant?
4)What is the acceleration of the elephant?
9)If the distance between 2 planets doubles, what happens to the force of gravity between them?
10)An ant is sitting on a spinning top. What force keeps the ant from falling off the top? What direction does it point?
11)Frank Ocean, Miley Cyrus, LeBron James
Who has the most inertia?
Who has the least?
12)A soccer player kicks a soccerball with a force of 20N. Another player comes and kicks the ball with twice the force. How does the acceleration change?
36)What is the acceleration for the object below?