Unit 5 – Force and Newton’s Laws Review Worksheet
1. I can define force and measure it in Newtons.
1.
What is force?
2.
What unit is force measured in?
3.
What does a force of 1 Newton mean? (Hint: Think F=ma)
4.
Calculate the force required to move a 2 kg pineapple at a rate of 4 m/s 2 .
5.
Draw a free body diagram of that pineapple being pushed to the right across a table.
6.
Draw a free body diagram of a sled coasting to the left.
7.
A pencil is thrown upward. Draw a free body diagram of the pencil: a) As it is moving upward approaching the highest point, and b)As it is moving downward
2. I can define friction, normal force, and weight.
8.
When does an object have a normal force?
9.
When does an object have friction?
10.
If a book is being pushed across a table to the right, which direction is the force of friction?
11.
What is the difference between mass and weight?
12.
Weight is the same as which force?
13.
What is the relationship between weight and normal force?
14.
Which of the following free body diagrams would have a normal force: a) a rock sitting at the bottom of the ocean, b) a rock falling through the water towards the bottom of the ocean, c) a bag of groceries sitting on a table, d) a dog walking on a street,
15.
e) a goat skydiving at terminal velocity, f) a car coasting down a mountain
Assume the acceleration due to gravity on Earth is 10 m/s
2
and acceleration due to gravity on Mars is 3.8 m/s
2
. For each of the following write down the WEIGHT and MASS of the object. a.
A 60 kg person on Earth b.
A 5 kg brick on Mars c.
A 20 N purse on Mars d.
Brittney Spears is 57 kg. What is her weight on Earth? Mars?
3. I can explain Newton’s first law.
16.
What is Newton’s First Law of Motion? (The long way AND the short way.)
17.
If friction did not exist, how would this affect the game of soccer?
18.
If friction did not exist and a 2 kg soccer ball was traveling at a constant velocity of 5 m/s, what amount of force would be required to keep it moving at the same speed and direction? Why?
19.
Two freshmen with new learner’s permits are practicing driving in the Thurston parking lot. Draw the free body diagram of a.
A student who is stopped. b.
A student who slams his foot on the gas pedal (moving to the right) c.
A student who coasts to a stop (moving to the right)
4. I can explain Newton’s second law and use it to solve a problem. (F = ma)
20.
What is Newton’s Second Law of Motion?
21.
If the same amount of force is applied to a bowling ball and a golf ball, which will accelerate more?
22.
If a 2 kg object accelerates at 9 m/s 2 , what is the net force?
23.
If 3.5 kg object has a 18 N net force up, what is its acceleration?
24.
If a net force of 420 N is applied to a wheelchair and it accelerates at 6 m/s 2 , what is its mass? Do you think someone is sitting in the wheelchair?
25.
Solve the free body diagrams: a.
b.
26.
Draw and solve a free body diagram (like the ones in 25-26) where a watermelon is being pushed across a table. It has a mass of 3 kg. The acceleration is 2 m/s 2 to the left and the force of friction is 2 N. Label and calculate all the other forces.
5. I can explain Newton’s third law.
27.
What is Newton’s Third Law of Motion?
28.
When a foot kicks a soccer ball, which experiences more force?
29.
If you dropped a test tube on the floor in class, why would it break, but the floor would show no damage? (Reference
Newton’s 2 nd and 3 rd Laws.)