Push & Pull
Problems
Friction
Momentum
Laws
100
A push or a pull.
What is a force.
100
Tommy pushes a box across the floor, from left to right, with 20 N of force. What is the net force?
What is 20 N to the right?
100
The force that one surface exerts on another.
What is friction?
100
What's the formula for momentum?
Momentum = mass x acceleration
100
Newton's Laws are all based on what? (2 things)
What is force and motion?
200
Magnitude & direction
What is the way forces can be described?
200
Tommy pulls on a rope with 10 N of force and his sister pulls on the other end of the rope with 20 N of force. What is the net force?
10 N of force in the same direction his sister is pulling.
200
Increasing weight of a chair or trying to drag a chair across sand.
What is the way that friction can be increased?
200
Explain the Law of Conservation of Momentum.
Momentum isn't created or destroyed, only transferred.
200
The Law of Inertia
Objects at rest will stay at rest and objects in motion will stay in motion unless acted upon by an outside force.
300
Adding forces together.
What is what you do if forces act in the same direction.
300
No motion occurs.
What is a balanced force.
300
Which has less friction - skis that have been waxed or skis that haven't been waxed?
What is skis that haven't bee waxed.
300
How can you increase the momentum of an object?
Either increasing the mass or increasing the acceleration.
300
Newton's 2nd Law
Acceleration depends upon the mass of an object and the force exerted on that object.
400
Subtracting forces from one another.
What is how you find the net force when forces act in opposition to each other.
400
A marble has a mass of 2 kilograms and is accelerating down a hill towards a wall at 10 m/s/s. How much force will it hit the wall with?
What is 20 Newtons?
400
What type of friction happens on a projectile?
What is air friction?
400
How do you know the direction of the momentum of an object?
It's the same as the direction of the velocity.
400
Explain how swimming demonstrates Newton's 3rd Law.
When you push back on the water, the water propels you forward (action/reaction).
500
Gravity and air resistance.
What are the forces acting on a projectile.
500
A brick has a mass of 100 kg and is being thrown at a rate of 50 m/s. What is it's momentum?
What is 5000 kg x m/s
500
What type of friction is occurring when a paper airplane is thrown?
What is air friction?
500
When two objects collide in the absence of friction, what will happen?
The momentum of the first object will be transferred to the second object.
500
How does hitting a baseball demonstration all three of Newton's Laws?
1st: ball will continue moving unless acted on by an outside force (the bat) 2nd: The force needed to hit the ball will depend upon the mass of the ball and how much force that bat put on the ball 3rd: When hit, the ball puts a force on the bat, and the bat puts a force on the ball
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