Vocabulary
A push or pull on an object.
What is force?
An object at rest will remain at rest, and an object in motion will remain in motion, unless an unbalanced force is applied
What is Newton's 1st law of motion?
The amount of force needed to move an object depends on the mass and acceleration of the object.
What is Newton's 2nd Law of Motion?
For every action, there is an equal and opposite reaction.
What is Newton's 3rd Law of motion?
The sum of all forces acting on an object.
What is net force?
A force that pulls objects towards the center of the Earth.
What is gravitational force?
Newton’s 1st Law is also known by this other name.
What is the law of inertia?
Force = Mass x Acceleration
What is the formula for force?
What is the unit measurement for force?
What is Newtons?
Student A is pushing a box with a force of 20N to the right. Student B is pushing with a force of 25 N to the left. What is the net force of this situation?
5 N to the left
A force that resists the movement of one surface against another.
What is frictional force?
A soccer ball will not move until someone kicks it. What force must act on it to overcome its inertia?
What is an unbalanced force?
A 5 kg object accelerates at 4 m/s². What is the force acting on it?
What is 20 N?
Measured in grams (g) or kilograms (kg)
What is mass?
Forces on an object that are equal in size and opposite in direction, cancelling each other out are called...
What is balanced forces?
The speed of an object in a particular direction.
What is velocity?
Why do you need to wear a seatbelt according to Newton’s First Law?
What is because when the car stops suddenly, your body would keep moving forward without a force (the seatbelt) to stop you?
A force of 37.5 N is applied to a shopping cart, and the cart accelerates at 2.5 m/s². What is the mass of the cart?
What is 15 kg?
Measured in meters per second squared (m/s²).
What is acceleration?
A sled is being pulled with a 15 N force to the right while friction resists with 6 N.
What is the net force on the sled?
Fnet=15−6=9 N to the right
The equal and opposite force applied by the second object back on the first object.
Which is reaction?
A bowling ball and a tennis ball are both at rest. Why does the bowling ball require more force to start moving?
What is because it has greater mass and therefore greater inertia?
Two forces act on a 4 kg object: 10 N to the right and 4 N to the left. What is the object’s acceleration and direction?
What is 1.5 m/s² to the right?
F = m x a
10 + -4 = 4 x a
6 = 4 x a
6/4 = a
1.5 = a
A person jumps off a small boat onto a dock. The boat slides backward. Explain the action–reaction forces and why both the person and boat move.
Action: Person pushes the boat backward.
Reaction: Boat pushes the person forward.
A 12 N force pushes an object to the right, while an 8 N force pushes it to the left. A frictional force of 2 N also acts to the left. What is the net force and its direction?
Fnet = 12−(8+2)=2 N to the right