Newtons 1st Law
What are the five ways to change an objects velocity?
Stop, Start, Change direction, Speed up, and Slow down.
You have two suitcases and apply the same force to both. How do you know which bag is heavier?
The heavier suitcase will have a smaller change in velocity than the lighter suitcase.
Newton’s Third Law says that for every action force, there is one of these.
Equal and opposite reaction force
What is a force?
A push or a pull that can change the motion of an object.
A 10 kg cart experiences a force of 50 N. Find its change in velocity
5 m/s
A puck is hit with a force of 6 to the right. A second force of 2 to the right is exerted on the puck. How did its motion change?
The object will speed up (The force was exerted in the same direction)
You have 2 identical baseballs on a tee. You hit one and it goes to the outfield.. How do you get the second ball to be a home run?
Exert a greater force onto the second baseball.
If you are pushing against the wall with a force of 30 N, how much force is the wall pushing back onto your hand?
30 N
What is velocity?
How fast something is moving in a specific direction.
A 100 kg object has a change in velocity of 8 m/s. Find the force.
800 N
A puck is hit with a force of 2 to the left. A second force of 2 to the right is exerted on the puck. How did its motion change?
The puck will stop (There is an equal force in opposite directions.)
An Elephant and a rabbit are running right at you.. Which will require a greater force to stop, and why?
The elephant because it has more mass than the rabbit.
A soccer player kicks a ball. What does the ball do to the player's foot?
It pushes back on the foot with an equal force in the opposite direction.
Deifne the word mass.
The amount of matter that makes up an object.
A force of 100 N causes a change in velocity of 5 m/s. Find the mass.
20 kg
A puck is hit with a force of 2 to the right. A second force of 5 to the left is exerted on the puck. How did its motion change?
The puck will change directions (A greater force in the opposite direction.)
Two objects experience the same net force. One has a mass of 5 kg and the other has a mass of 20 kg. Which has the greater change in velocity?
The 5 kg object will have a greater change in velocity since it has less mass.
A large truck collides with a small car. Which vehicle exerts the greater force during the collision?
Neither. Both exert equal forces on each other.
What is friction?
A force in the opposite direction of motion.
A 50 kg object has a change in velocity of 3 m/s. Find the force.
150 Newtons
A puck is hit with a force of 4 to the left. A second force of 2 to the right is exerted on the puck. How did its motion change?
The puck will slow down!
Two objects experience the same force and have the same change in velocity. What does that tell us about their masses?
Their masses are the same.
During a collision, a small car experiences more change in velocity than a truck. Does this mean the car experienced a greater force?
No. They exert equal and opposite forces, but because the car had less mass, it had a greater change in velocity than the truck which had more mass.
What is the difference between balanced forces and unbalanced forces?
Balanced forces - Both forces are equal, no motion
Unbalanced forces - Force on one side is greater than the other, so an object moves
A football player kicks a stationary training sled with a net force of 900 N. The sled accelerates at 3 m/s.
What is the mass of the training sled?
300 kg