a steady rate. (b) It increases at a steady rate. (c) It increases and then decr

Question

a steady rate. (b) It increases at a steady rate. (c) It increases and then decreases. (d) It decreases and then increases. (e) It remains constant. 20. A large crate of mass m is placed on the back of a truck but not tied down. As the truck accelerates forward with an accel- eration a, the crate remains at rest relative to the truck. What force causes the crate to accelerate forward? (a) the normal force (b) the force of gravity (c) the force of friction between the crate and the floor of the truck (d) the ma" force (e) none of these 21. Which of the following statements are true? (a) An astronaut's weight is the same on the Moon as on Earth. (b) An astro- naut's mass is the same on the International Space Station as

Explanation / Answer

force of friction between truck and crate caused the crate to accelerate forward

as it'll act in the direction of motion of truck and keeps the create in rest position with respect to truck

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