Vocabulary
The force that pulls things towards the center of earth is called?
Gravity
Which situation shows balanced forces?
A. A soccer ball being kicked
B. A book sitting on a desk
C. A car accelerating
D. A skateboard speeding up
B
The sum of all the forces acting on an object is known as?
Net force
What is friction?
A. A force that pushes objects apart
B. A force that slows motion between surfaces
C. A force that pulls objects together
D. A force only found in water
B. A force that slows motion between surfaces
Eden is playing Mario Kart. A banana peel sits on rainbow road until Mario's kart (Eden) hits it and spins.
What law is it?
Newtons 1st law
Forces acting on an object in equal and opposite directions. The net force is equal to zero, causing no change to the object's motion.
Balanced Forces
Which situation shows unbalanced forces?
A. A tug-of-war with equal pulling on both sides
B. A box not moving on the floor
C. A bike speeding up
D. A picture hanging on a wall
C
Forces in the same direction combine by
Addition
Which surface would create the MOST friction?
A. Ice
B. Tile floor
C. Sandpaper
D. Glass
C. Sandpaper
Emery and Justin go sledding. They both push identical sleds, but Justin pushes his sled harder and it accelerates the sled more.
What law is it?
Newtons 2nd law
Forces that are not equal in magnitude and may or may not act in the same direction. The net force is not equal to zero, causing the object to accelerate and change its state of motion.
A soccer ball rolls across the grass and slows down due to friction.
Are the forces balanced or unbalanced?
unbalanced
Forces in the opposite direction combine by
Subtraction
What happens when two opposite magnetic poles meet?
A. They repel
B. They attract
C. Nothing happens
D. They disappear
A. They repel
Allison is ballin' in gym class. When she jumps up to shoot, her feet push down on the floor and the floor pushes her upward.
Newtons 3rd law
A force that makes a moving object slow down or stop moving
Friction
Two students push a box from opposite sides with equal force and the box does not move.
Are the forces balanced or unbalanced?
Balanced
A player pushes a sled with 30 N of force.
Another player pushes the sled in the same direction with 20 N.
Net force = ______ N
50N
Which of the following is true about the relationship between mass and gravitational pull?
A. Objects with less mass have stronger gravitational pull
B. Objects with more mass have stronger gravitational pull
B. Objects with more mass have stronger gravitational pull
What law is it?
Newtons 1st law
A push or pull that makes something move or be put into motion
Force
A book rests on a table while gravity pulls down and the table pushes up.
Are the forces balanced or unbalanced?
Balanced
A student pushes a box 45 N right.
Friction pushes 25 N left.
Net force = ______ N
Which direction will the box move? __________
20 N
Right
A football player pushes a sled with a mass of 80 kg during practice.
He applies a force of 320 N to the sled.
What is the acceleration of the sled?
A = 4 m/s2
Mohammed and Jackson are in Mr. Bartella's room using his nice rolling chairs. Mohammed is sitting in the rolling chair and Jackson pushes Mohammed forward and he crashes into the desk. The chair rolls backward across the classroom with equal force.
What law is it?
Newtons 3rd law