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I wonder if other dogs think poodles are members of a weird religious cult. - Rita Rudner. Chapter Menu. Lesson 1: Combining Forces Lesson 2: Types of Force Lesson 3: Unbalanced Forces and Acceleration. Click on a hyperlink to view the corresponding lesson. 2.1 Combining Forces. force
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I wonder if other dogs think poodles are members of a weird religious cult.
- Rita Rudner
Lesson 1:Combining Forces
Lesson 2:Types of Force
Lesson 3:Unbalanced Forces and Acceleration
Click on a hyperlink to view the corresponding lesson.
Newton’s first law of motion
law of universal gravitation
A. Weight is the gravitational force on a object and changeswith location.
Where would you weigh less?
1. Give an example of something that has gravity.
2. What are the two ways to increase the size of the force of gravity?
3. What changes as you get farther from the Earth, mass or weight?
4. What is the formula for speed?
i. Usually friction is present and an unbalancing force must be applied to keep an object moving.
A. Static friction is the force between two surfaces in contact that keeps them from sliding when a force is applied.
Keeps things in place! Always a Balanced forces
If the object doesn’t move as you push on it with more and more force
Then the forces are balanced
Which means that static friction increases to match your force on the book
i. Friction is a force that ______ motion
ii. What kind of friction keeps a car from moving when you push on it?
iii. What is one way to increase friction?
iv. What are the four types of friction?
I. What kind of force does a rubber band exert when you stretch it?
II. Give an example of a compression force?
III. What are elastic forces?
IV. What is the “normal” force?
V. Why is tension important to a bridge?
VI. Why is compression important to a bridge?
California Standards Practice
Concepts in Motion
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If a student pushes a book across a table with a force of 10 N and the force of friction is 2 N, what is the net force on the book?
A 0 N
B 2 N
C 8 N
D 12 N
What would cause an object to have a larger acceleration?
A increasing the net force applied
B decreasing the net force applied
C increasing the mass and keeping the net force constant
D none of the above
What causes a change in motion on an object?
A zero net force
B unbalanced force
D balanced force
A car is driving at a constant velocity. Which of the following statements is true?
A A balanced force keeps it moving.
B The car is moving in a circle.
C An unbalanced force keeps it moving.
D Friction keeps the car moving.
For every action force, there is a reaction force that is ____.
A in the same direction
B equal to the two objects
C equal and in the opposite direction
D unequal and in the direction of the object with less mass
Two people are pushing in opposite directions on a box. One person is pushing to the left with a force of 250 N, the other is pushing to the right with a force of 400 N. What is the resulting force vector?
A 150 N to the right
B 650 N to the right
C 150 N to the left
D 400 N to the right
SCI 2.e, 2.f
You throw a 0.9 kg ball with a force of 17 N. What is the ball’s acceleration?
A 0.05 N
B 15.3 N
C 13.3 m/s2
D 18.9 m/s2
A tennis ball hit by a racket has an acceleration of 2000 m/s2. If the net force on the tennis ball is 125 N, what is the tennis ball’s mass?
A 16 kg
B 0.25 kg
C 0.06 kg
D 0.43 kg
What balanced forces are acting on a book sliding across a table?
B gravity and friction
C sliding friction, normal force, and gravity
D gravity and normal force