Unit 4 Force & Motion/ Newton S Laws Review

Unit 4 Force & Motion/ Newton’s Laws Review

Name: ______Class Period: ____

Calculate speed, distance, or time in the following. Make sure you show the correct units or the answer will be incorrect.

Speed = Distance/time , Distance = Time X Speed, Time = Distance/speed

1. What is the distance travelled if a woman’s walking speed is 2 meters per second, and she walks for 30 seconds?

1. What is your distance travelled in 10 hours, going 5 miles per hour?

Determine the net force and tell which direction the object moves

1. 20 Newtons pulling to the right & 40 Newtons pushing to the right. ______
2. 20 Newtons pushing down and 50 Newtons pulling up: ______
3. 40 Newtons pushing left and 35 Newtons pushing right: ______

Answer the following from your notes

1. Inertia states that an object in motion tends to stay in ______
2. Unbalanced forces will cause an object to: ______
3. The mass of an object is the same anywhere in the ______, but weight is determined by this force: ______

Find Force, mass, or acceleration for the following:

1. Find the force of an punch with 5kg of mass behind it, and accelerating at 30m/s2:

1. Find the acceleration of an object with 10N of force and a mass of 500kg:

1. Find the mass of an object if the force is 20N and it’s acceleration is 5m/s2:

1. Which example is best illustrated by the graph

1. A biker increases his speed as the race comes to an end
2. A biker travels along a level path then goes up a hill and then travels on a level path again.
3. A biker continuously accelerates through to the end of the race
4. A biker slows down as he gets tired at the top of the hill

1. Which example best illustrates the graph above.

1. A roller coaster starts moving, increases its speed, then slows back down to a stop
2. A roller coaster goes up a hill then down the hill
3. A roller coaster increases its speed throughout a loop
4. A roller coaster increases its speed, lowers its speed at the hill, and then increases its speed again.

1. Newton’s first law is the law of inertia. Which would have more inertia: A bowling ball, feather, or a mouse?

1. What types of forces allow an object to stay at rest or at a constant velocity?

1. Balanced
2. Unbalanced
3. Accelerated
4. Applied

1. Describe the forces acting on an object sitting on a table. Are they balanced or unbalanced? ______

1. Unbalanced forces always cause an object to stop, start, speed up, slow down, or change direction. What is one word that can be used to describe all of these changes in motion?______

1. A train that is accelerating at 5m/s2 down the tracks and crashes into a car. If the train weighs 20,000kg, how much force does the car experience:

1. What will be the result of the following situation?

82 N67 N

Net Force: ______Direction of Motion: ______

Is this balanced or unbalanced forces? ______

1. If the teams in question 6 keep pulling with the same force, then what will be the result
2. The winning team will move backwards with an ever increasing speed
3. The winning team will move backwards with a constant speed
4. The winning team will not move
5. The winning team will move backwards with a slowing speed

1. Use Newton’s 2nd Law, F = ma. If a hang-glider with a mass of 100 kg accelerates 5 m/s2, when he smashes into a cliff, what is the force?

1. Newton’s 2nd law describes the relationship between Force & Mass. It can be written that Force = mass multiplied by acceleration (F = ma). How would you re-write the formula if you had to find the mass and were given the force and the acceleration:
2. m = F/a
3. m = F x a
4. m = a/F
5. m = a + F

1. Newton’s third law states that for every action, there is an equal and opposite reaction. If a car smashes into a wall with 4,000 N of force, and the wall doesn’t move, then how much force does the wall exert back on the car?

1. If two forces are pulling on an object with 4 Newtons each to the right, and one force is pulling on an object with 4 Newtons to the left. What is the net force?
2. O N
3. 4 N right
4. 4 N left
5. 8 N right

1. Two 2000 kg cars run into a brick wall at the same time, both accelerating 8 m/s2 as they crash, how much force is exerted on the wall?

1. Which force causes an acceleration of 9.8m/s2 on earth: ______

1. If a ball is rolling forward, then the force of friction is acting in which direction:

1. Forward
2. Backward
3. Upward
4. Downward

1. Which force causes things to slow down on earth:

1. Gravity
2. Friction
3. Magnetic
4. Strong Nuclear Force

1. Which of Newton’s laws is best represented by a boy trying to see how far he can kick a soccer ball, a tennis ball, and a bowling ball?

1. Which of Newton’s laws is best represented by throwing a ball at a wall and seeing how far it bounces back?

1. Which of Newton’s Laws would be best represented by a girl flying over her handle bars as she accidentally pushes on the front brake of her bicycle?

1. A spacecraft is drifting at a constant speed of 500m/s. If a 20N Force is applied to the front of the craft and a 20N force is applied to the back of the craft, what will be the result?
2. The spacecraft will stop with the balanced forces
3. The spacecraft will continue at the same speed with the balanced forces
4. The spacecraft will increase its speed forward
5. The spacecraft will decrease its speed forward