Page 38 - Science Course 2 (Book 2)
P. 38
Mo8-L4: Key Concept Check
Direction: On the line before each statement, write T if the statement is true or F if the statement is false.
1. Newton’s third law of motion states that when an object exerts a force on another object, the
second object exerts an equal force in the same direction.
2. The forces that two objects exert on each other are called a force pair.
3. Forces in a force pair never cancel each other.
4. The force that a hammer exerts on a nail is the reaction force.
5. If an object experiences a net unbalanced force, the object accelerates.
6. In the equation p = m × v, the letter p stands for momentum.
7. A bullet has more momentum than a moving ship.
8. In collisions, momentum is seldom conserved unless an outside force acts on the colliding
objects.
9. A collision between two billiard balls is an elastic collision.
10. A force that causes objects to gain momentum is friction.
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