Motion
Changing Motion
Contact & Non-Contact
Balanced or Unbalanced?
Forces
100
How will the car shown move?
Forwards
100
What happens when the marble hits the wall?
It will bounce in a different direction.
100
Anna touched the toy truck with her finger and the truck started to roll.
Is this contact or non-contact force?
Contact
100
Are the forces balanced or unbalanced?
Balanced
100
Apples hanging from tree branches eventually fall to the ground.
Which force most likely causes the apples to fall to the ground?
Gravity
200
How will the car shown move?
Backwards
200
What happens when a ball rolls into the grass? Why?
It slows down because the surface is bumpy.
200
Ms. Dorton pushes Zoe in a swing. Is this a contact or non-contact force?
Contact
200
Anna touched the toy truck with her finger and the truck started to roll.
Were all the forces on the truck balanced? How do you know?
The forces on the truck were not balanced because it began to move.
200
If two people in different places in the world drop an object, do they fall toward the same point? Why?
Yes, because all things fall toward the center of the Earth.
300
Which statement is true?
a. Ball A is faster than Ball D
b. Ball A is slower than Ball B
c. Ball B is faster than Ball C
d. Ball B is slower than Ball A
d. Ball B is slower than Ball A
300
The school bus is late to school. It normally takes 10 minutes, but the driver is driving faster. When will they get to school?
a. less than 10 minutes
b. more than 10 minutes
c. exactly 20 minutes
d. exactly 10 minutes
a. less than 10 minutes
300
Akeem held a ball. Then, he dropped the ball.
Did a contact or non-contact force cause the ball to drop?
Non-Contact Force
300
A class studies forces by playing tug-of-war with a heavy rope. In tug-of-war, two teams pull on a rope. A team wins by pulling the other team over the line. This drawing shows how they play tug-of-war.
What happens to the students if the group on the right pulls with more force than the group on the left? Why?
They will move toward the right because it is an unbalanced force.
300
How many forces are acting on the car?
1
400
Charlotte and Rick place a small ball on a table. They want to push the ball to Point X. The arrows show the directions of some forces they can apply to the ball.
From which directions should they push the ball so that it rolls toward Point X.
a. 1 and 2
b. 1 and 3
c. 2 and 4
d. 3 and 4
c. 2 and 4
400
This soccer ball is moving to the right as shown by the arrow. Where should you place a pushing force to make the ball move faster without changing direction?
point W
400
A paper clip is pulled in by a magnet. Is this a contact or non-contact force?
Non-Contact, the magnet doesn't have to touch the paper clip to pull it in.
400
A class studies forces by playing tug-of-war with a heavy rope. In tug-of-war, two teams pull on a rope. A team wins by pulling the other team over the line. This drawing shows how they play tug-of-war.
What happens if both of the groups pull on the rope with exactly the same amount of force? Why?
They will not move because it is a balanced force.
400
How many forces are acting on the car?
2
500
The following trucks are pushed with the same amount of force.
Which truck will roll the farthest?
10 g
500
What question can be answered using the pictures below?
a. How does a balanced force make the car move?
b. How does the direction of the force affect how the car moves?
c. How does the number of forces affect the speed of the moving car?
d. How does the strength of the force affect the direction of the moving car?
b. How does the direction of the force affect how the car moves?
500
Mrs. Belk's hair stands up when she comes close to a rubbed balloon. Is it a contact or non-contact force causing her hair to stand up?
Non-Contact
500
Two students are pushing on opposite sides of a box with equal force.
Which statement best describes what will happen?
The box will not move because it is a balanced force.
500
Anna touched the toy truck with her finger and the truck started to roll.
What force acted on the truck?
The force on the truck was a push from Anna’s finger.