Motion and forces Wrap-up

Any force that can act on something without touching it is called

• gravity

• distance

• spring force

• noncontact force

Which of these show balanced forces

• 
• 
• 
• 

* A box is sitting on the floor.

* Then, two workers start pushing on the box with the same amount of force.

*This is shown in the picture below. The arrows, in the picture, show the direction of each force.

* If the box does not move, what best explains force 1 and force 2?

• Force 1 is stronger than force 2.

• Force 1 is weaker than force 2.

• Force 1 and force 2 are equal in strength

• Force 1 and force 2 are pushing in the same direction.

Kyle and Jon are both pushing the same box. Kyle is pushing to the right. Jon is pushing to the left. The box will not move if:

• Kyle stops pushing the box, but Jon does not.

• Jon and Kyle push the box with the same amount of force.

• Jon pushes the box with more force than Kyle.

• Kyle pushes the box with more force than Jon.

Andy and his friends are playing baseball. They each hit the ball a different distance, shown in the table below. If each child hit the ball from the same place, who most likely hit the ball with the greatest force?

• Andy

• Jill

• Susan

• Mike

Which of these steps is most likely to be part of an investigation about friction?

• testing which surface is easier to slide a wooden block across

• putting different kinds of batteries in a toy car

• measuring how long it takes one full cup of water to evaporate

• counting how many paper clips stick to a magnet in a chain

* The image below shows a toy truck rolling down a slope from position A.

* When it reaches the bottom of the slope, it travels a short distance on a flat surface and stops at position Z.

* The toy truck is rolled down the slope again, but this time it starts rolling down from position C.

* It reaches the bottom of the slope, travels a short distance on the flat surface, and stops at position X.

* If the toy truck is rolled down the slope from position B, where will it most likely stop?

• near position Z

• near position X

• near position W

• near position Y

* Tamara spins a top as quickly as she can.

* There is a red dot on the top.

* If Tamara watches the top spin from directly above, which path could the red dot take?

• 
• 
• 
• 

*The pendulum of a clock is being used to tell time. The pendulum looks like the one in the picture below. The pendulum swings back and forth continuously at the same speed.

*A student counts how many times the pendulum swings back and forth over four minutes. The data is recorded in the table below.

* A student is going to observe the pendulum of the clock for 6 minutes.

*How many swings should the pendulum of the clock make?

• 50 swings

• 70 swings

• 60 swings

• 10 swings

Jenny sees a cup lying on the ground. She taps it with her foot. The cup begins to roll. The cup is wider at the top than at the bottom. Which arrow shows how the cup will move?

• 
• 
•