Unit 1 Exam Review

Unit 1 Exam Review

by Mr. Treviño

​Newton’s 2nd Law

  “If a body is acted upon by an unbalanced force, it will accelerate.”

​Stated as a formula:

F_net = ma

​

Note that the units for force are kgm/s2 or N

​

Fnet = Net Force

m = mass

a = acceleration

Multiple Select

Given the net forces on and the masses of the blocks shown above, which two blocks have the same acceleration? Select two answers.

• Block A

• Block B

• Block C

• Block D

​Free Body Diagrams

​Free body diagrams show the magnitude and direction of ALL of the forces acting on an object.

We represent the object as a box with the force arrows coming out from the centre, in the direction they are acting.

Remember that the size of the arrow indicates its relative magnitude.

Multiple Choice

A box is pulled along a surface of negligible friction by a spring scale that exerts a force F on the block. The mass of the block is 2kg , and the spring scale reads 15N. Which of the following free-body diagrams can be used to show the magnitude and direction of all the forces exerted on the block as it is pulled along the surface?

​Graphing motion

Multiple Choice

Which of the following is true about the speed of the object during the time interval from 4s to 8 s?

• It increases during the entire interval.

• It decreases during the entire interval.

• It remains the same.

• It first decreases and then increases.

• It first increases and then decreases.

Multiple Choice

Which of the following is true about the speed of the object during the time interval from zero to 4 s?

• It increases during the entire interval.

• It decreases during the entire interval.

• It remains the same.

• It first decreases and then increases.

• It first increases and then decreases.

Multiple Choice

Which of the following is true about the acceleration of the object during the time interval from 4 to 8 s?

• It increases during the entire interval.

• It decreases during the entire interval.

• It remains the same.

• It first increases and then decreases.

• It first decreases and then increases.

Multiple Choice

What is the net displacement of the object for the time interval from 4 to 8 s?

• 0 m

• 5 m

• 10 m

• 20 m

• It cannot be determined without knowing the initial position of the object.

Multiple Choice

What is the net displacement of the object for the time interval from 0 to 4 s?

• -10 m

• 5 m

• -5 m

• 10 m

• It cannot be determined without knowing the initial position of the object.

Multiple Choice

What is the net displacement of the object for the time interval from 0 to 8 s?

• 5 m

• 15 m

• -15 m

• 0 m

• It cannot be determined without knowing the initial position of the object.

Multiple Choice

1.       An object is dropped from rest and falls freely 30 m to Earth. When is the speed of the object 10 m/s?

• After it has fallen 10 meters.

• At no time the speed is 10 m/s

• During the entire first second of its fall

• At the end of the first second of its fall