1. Clicker Question Review Objects in Motion

2. Does a force keep the cannonball moving forward after it leaves the cannon?
Yes No

3. The force of gravity Inertia Solar Wind Magnetic Forces
Asteroids have been moving through space for billions of years. What keeps them moving?
The force of gravity
Inertia
Solar Wind
Magnetic Forces

4. What physical quantity is a measure of how much inertia an object has?
Mass
Volume
Density
Area
Weight

5. The mass of 1 kilogram of iron
Is less on the Moon.
Is the same on the Moon.
Is greater on the Moon.
Weighs the same everywhere.

6. The equilibrium rule, F = 0, applies to
objects or systems at rest.
objects or systems in uniform motion in a straight line.
Both of the above.
None of the above.

7. The platform in the diagram is in mechanical equilibrium (F = 0)
The platform in the diagram is in mechanical equilibrium (F = 0). What is the tension in the rope on the right-hand side?
850 N
300 N
550 N
400 N
450 N

8. Which of the following is acceleration?
How much distance is traveled in a given amount of time.
A push or a pull that changes an object’s motion.
A change in velocity or the motion of an object.
The amount of matter contained in an object.

9. You drive around a curve on the road while maintaining a constant speed of 50 miles/hour. Did your velocity change and therefore did you undergo an acceleration?
Yes No

10. There is no acceleration when velocity decreases.
You drive a car toward the south and apply the brakes causing a decrease in your velocity. In what direction is the acceleration.
South
North
There is no acceleration when velocity decreases.

11. On Earth, the acceleration due to gravity is approximately:
1 m/s2
8 m/s
10 m/s
6 m/s
8m/s2
10 m/s2

12. A bowling ball and a feather are dropped from the same height on the Moon. Which of the following is true?
The bowling ball will hit the ground first because it has a greater mass.
Both objects will remain stationary because there is an absence of gravity on the lunar surface.
Both will hit the ground at the same time.
The feather’s smaller mass will actually allow it to fall faster than the bowling ball in the absence of air resistance.

13. Your velocity increases from 20 m/s to 50 m/s in a time span of 3s
Your velocity increases from 20 m/s to 50 m/s in a time span of 3s. What is the magnitude of your acceleration.
30 m/s
30 m/s2
10 m/s
10 m/s2
20 m/s
20 m/s2

14. You are driving North on Highway 99 at a velocity of 30 m/s
You are driving North on Highway 99 at a velocity of 30 m/s. Your velocity decreases to 20 m/s in a time span of 2 s. Which of the following is your acceleration?
Acceleration = 0 because your velocity decreased.
5 m/s2 toward the South.
5 m/s2 toward the North.
10 m/s2 toward the South.
10 m/s2 toward the North.