Newtons 1st Law
State Newtons 1st Law
Law of Inertia
State Newtons 2nd Law
F=ma
State Newtons 3rd Law
Force Pairs
What does a constant velocity tell us?
No acceleration, no net force
Force of Friction depends on what other force?
Normal Force
Draw a photo of the scenario in which a car accelerates from stop but there is an Owala sitting on the roof of the car.
photo
A 2 kg plate is being slid across at table at a constant speed. What is the net force?
0 N
Explain how one team can win tug of war even though there are equal and opposite forces
masses are different so the teams will have different accelerations
A 1.5 kg cat jumped from a tree and is in the air. Draw the FBD
Diagram
Describe a scenario of static friction
object stopped on incline, pulling an object before it starts moving
The state of motion an object remains in when the net force acting on it is equal to zero.
constant velocity, 0 acceleration
The normal force acting on an object is 50 N. What is the mass of the object?
5 kg
A foot exerts 12 N of force on a soccer ball. How much force is exerted by the ball on the foot?
12 N
A 7 kg wagon is being pulled with a 17 N force to the right and pushed with a 15 N force to the right. What is the net force?
32 N to the right
Describe a scenario of Kinetic Friction
Ball rolling on grass, object sliding down an incline, roller blading
A hockey puck slides across frictionless ice at 15m/s. Assuming no air resistance, this force is needed to keep it moving at that constant speed.
0 N
This standard SI unit of force is defined as the force required to accelerate 1 kg at 1m/s^2
1 N
A bear pushes a tiny chipmunk. Which animal will have a greater acceleration?
chipmunk
A wagon having a mass of 14 kg is accelerated across a level road at
0.50 m/s2. What net force acts on the wagon horizontally?
7 N
A student pushes a 12 kg table across a flat classroom floor with a horizontal pushing force of 20 N, moving it at a constant speed of 0.5 m/s.
What is the net force acting on the bookshelf?
What is the magnitude and direction of the friction force acting on the bookshelf?
0 N
20 N
Explain why if a table cloth is quickly removed from a table, all the cups will stay. But if the table cloth is removed slowly, the cups will tip over.
More acceleration=more force. The force needs to be greater than the force of friction.
An astronaut weighs 784 N on Earth. On the Moon, where g = 1.6 m/s^2, what is the astronaut's mass.
80 kg
When a person steps off a boat onto a dock, the boat moves in this direction.
Backwards, away from dock
A 0.25 kg leaf is falling to the ground. It experiences 1.5 N of air resistance. What is it's acceleration?
3.8 m/s^2
A 6 kg chair initially at rest on a horizontal floor requires a 30 N horizontal force to set it in motion. Find the coefficient of static friction between the chair and the floor.
0.51