Consider the situation below. Which of these is the best example of Newton's 1st Law (inertia)?
A. Tom uses a cane to walk across the road.
B. A tennis player throws the tennis ball into the air for a serve and the ball falls to the ground.
C. A bird takes flight from the ground.
D. You go down a steep hill in a sled and it feels like your stomach is going up into your throat
C. A bird takes flight from the ground.
For each statement below, indicate which of Newton's three laws the statement represents.
1. When riding the bumper cars at the fair, you bump into your friend and your cat bounces backwards.
2. A ball is rolling straight across the floor until Bradley kicks it
3. A bowling ball and a baseball both roll across your foot at the same speed. The bowling ball hurts much more.
4. Your car breaks down. As your friends help you push it, it begins to move and speed up.
5. A fireman turns on his hose and is knocked backwards.
6. A soccer ball will not move until a player kicks it.
7. F = ma
1. Newton's 3rd Law - Action and Reaction
2. Newton's 2nd Law - Force and Acceleration
3. Newton's 1st Law - Inertia
4. Newton's 2nd Law - Force and Acceleration
5. Newton's 3rd Law - Action and Reaction
6. Newton's 1st Law - Inertia
7. Newton's 2nd Law - Force and Acceleration
A roller coaster begins at the top of a hill. If it accelerates at the rate of 2 m/s and has a mass of 2000 kg, what net force is acting on it? (Force=mass × acceleration)
A. 0.5 N
B. 4000 N
C. 1000 N
D. 0.001 N
To find the net force acting on the roller coaster, we can use the formula:
Force = mass × acceleration
Given:
Mass = 2000 kg
Acceleration = 2 m/s^2
Substituting the given values into the formula:
Force = 2000 kg × 2 m/s^2
Force = 4000 kg⋅m/s^2
The unit of force is Newton (N). Therefore, the net force acting on the roller coaster is 4000 N.
Thus, the correct answer is B. 4000 N.
Matt is walking at 1.25 miles per hour to the east. Jaime is walking at 1.25 miles per hour to the south. Which statement describes the movement of Matt and Jaime?
A. They have the same speed but different velocities
B. They have different speeds and different velocities
C. They have the same speed and the same velocities
D. They have different speeds but the same velocity.
The correct answer is A. They have the same speed but different velocities.
Speed refers to the rate at which an object is moving, and in this case, Matt and Jaime both have a speed of 1.25 miles per hour.
Velocity, on the other hand, includes both speed and direction. Since Matt is moving to the east and Jaime is moving to the south, their velocities are different even though their speeds are the same.
bot please help me out
If the distance between two objects decrease and the masses of the objects remains the same, then the force of gravity between the two objects:(1 point)Responses
increases then decreases increases
then decreases decreases
decreases increases
increases
remains the same
remains the same