Question

As you are walking, you foot gets caught on an uneven piece of sidewalk and you trip and fall. Which of the following explains what is happening using Newton's Laws? (1 point)
Responses

Your foot hit the sidewalk and provided a force on it, so the sidewalk will provide another force back on your foot, equal in magnitude but opposite in direct
Your foot hit the sidewalk and provided a force on it, so the sidewalk will provide another force back on your foot, equal in magnitude but opposite in direct

The sidewalk pushed you, causing a rapid force that made you fall
The sidewalk pushed you, causing a rapid force that made you fall

The sidewalk provided a force to stop your foot, but the top of your body was still moving which is what causes you to tip over
The sidewalk provided a force to stop your foot, but the top of your body was still moving which is what causes you to tip over

Your foot pushes the sidewalk with such force that it causes the next piece of sidewalk to be uprooted, which makes your next step miss your footing
Your foot pushes the sidewalk with such force that it causes the next piece of sidewalk to be uprooted, which makes your next step miss your footing
Question 2
Look at Zeke.



He’s riding his skateboard down a ramp. Assume that his acceleration is 0.8 m/s2. How much force does it take for him to accelerate at this rate? Zeke has a mass of 50 kg.

(1 point)
Responses

62.5 N
62.5 N

40 N
40 N

40 kg
40 kg

50 N
50 N
Question 3
A block with a mass of 55 kg is pulled with a force of 220 N. Assuming a frictionless surface, what will be the acceleration of the block?(1 point)
Responses

9.8 m/s2
9.8 m/s 2

4.0 m/s2
4.0 m/s 2

0.25 m/s2
0.25 m/s 2

22 m/s2
22 m/s 2
Question 4
Trial Force (N) Acceleration (m/s^2)
1 10 N 2.5
2 12 3
3 22 5.5
Students are running an experiment in which they are measuring the acceleration after applying forces to a cart. Using the data above, what is the mass of the cart?

(1 point)
Responses

8 kg
8 kg

6 kg
6 kg

2 kg
2 kg

4 kg
4 kg
Question 5
According to Newton's Third Law, if a sledgehammer hits a wall with a force of 1000 N, how much force does the wall hit the sledgehammer?(1 point)
Responses

-1000 N
-1000 N

1000 N
1000 N

500 N
500 N

0 N
0 N
Question 6
Which of the following would be a situation with unbalanced forces?(1 point)
Responses

Two people of opposite sides of a big tire. One pushes the tire and one pulls it with equal force
Two people of opposite sides of a big tire. One pushes the tire and one pulls it with equal force

Two people pulling on the same side of a wheelbarrow
Two people pulling on the same side of a wheelbarrow

A team of players in tug of war pulling on the rope, each team with equal numbers of people pulling with equal strength
A team of players in tug of war pulling on the rope, each team with equal numbers of people pulling with equal strength

Two people not touching a crate that is sitting stationary
Two people not touching a crate that is sitting stationary
Question 7
Why is it generally easier to push a heavy object that is already moving instead of the same heavy object that is stationary(1 point)
Responses

The force of friction on the object is different if it is stationary or not
The force of friction on the object is different if it is stationary or not

The force of the push on the object is different if it is stationary or not
The force of the push on the object is different if it is stationary or not

The normal force on the object is different if it is stationary or not
The normal force on the object is different if it is stationary or not

The force of gravity on the object is different if it is stationary or not.

Answer 1

1) The sidewalk provided a force to stop your foot, but the top of your body was still moving which is what causes you to tip over

2) 40 N

3) 4.0 m/s^2

4) 4 kg

5) 1000 N

6) Two people pulling on the same side of a wheelbarrow

7) The force of friction on the object is different if it is stationary or not