Which two measurements are needed to determine the speed of an object?

Which unit would be most appropriate to measure the length of the bowling lane?

A soccer player kicks a ball. According to Newton’s third law of motion, the player’s foot exerts a force on the ball. The ball exerts a force on the foot. Why don’t the forces cancel out to result in a net force of zero?

Which of the following describes an object moving in a circle steadily?

A skydiver jumps out of a plane. She falls downward at a very fast speed. When she opens her parachute, she slows down. What force pulled the skydiver to the ground?

Why is the friction force considered to be a contact force?

What do the length and the direction of the arrows in a force diagram represent?

How can you tell that forces in a force diagram are balanced?

How can you tell that forces in a force diagram are unbalanced?

If a ball has 50 N of force pushing from the left and 25 Newtons of force pushing from the right, what is the motion of the box?

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